PROCEEDINGS OF THE

NUCLEAR PHYSICS AND SOLID STATE PHYSICS SYMPOSIUM

BOMBAY, DECEMBER' 28-31, 1978

VOLUME 21C

SOLID STATE PHYSICS

ORGANISED BY THE

DEPARTMENT OF ATOMIC ENERGY

GOVERNMENT OF INDA

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TF.C: '"' 8C!-!E

INFORWIAnONSBiaiJOTHEK

CONTENTS

L LOW TEMPERATURE PHYSICS AND SUPERCONDUCTIVITY

1. Electrical Resistivity of Indium Sulphide (INS)Crystals T3own to 4. 2 K and upto 80 K. Bar :

A. K. Bandvopadhvav. A. K. T. Oza, M. R.

Madhava, H. L. Bhat, R. Srinivasan and

E. S. R. Gopal. i

2. Superconductivity in Scandium-Zirconium Systems :

Sushil Auluck and G. S. Singh. 4

3. Variation in Amplitude of Microwave Induced Steps

in Current Voltage Characteristic of Clarke Solder

Blob Junctions with Microwave Power and Frequency:

V. S. Tomar, N. D. Kataria, Madhu Prasad and

A. K. Gupfa. 6

4. Hotspot Induced Anomalies and Hysteresis in Long

Superconducting Ag-Sn Proximity-Effect Bridges :

G. Dharmadurai and B. A. Ratnam. 9

5. Fhouon-Injection-Induced Nonequilibrium Phenomena

in Superconducting Proximity-Effect Bridges :

G. Dharmadurai and B. A. Ratnam. 13

6. Electron Phonon Coupling Constant and Critical

Temperature of Some A15 Compounds of Nb and

V : M. Ray Chaudhory, P. Chatterjee and

S. Chatteriee.lfe

7. Study of Cryosorption of Nitrogen -C-onden«sd Carbon-

dioxide Layers : V. Venkataramanan, G. Rangarajan

and R. Srinivasan.19

8. Study of Lead-Lead Oxide-Lead* Tunnel Junctions :

Madhu Prasad, A.K. Gupta, N.D. Kataria and

V. S. Tomar." 22

H. ELECTRONIC PROPERTIES OF SOLIDS

1. Positron Annihilation in Oriented Single Crystals -

Two Photon Angular Correlation : P. Ramaswamy,

F.D. Gnanam, S.Krishnan and G. &. Laddha. 25

-1-

-ii-

gafje

2. Two Parameter Positron Life Time and Momentum

Correlation Studies in Solids and Liquids : P. Sen

and N. Panigrahi. 29

3. Positron Lifetime Studies in Some Enzymes :

H. Prasad, K. P. Singh and P. C. Jain. 32

*4. Nature of Chemical Bond Through Positron

Angular Correlation : S. Ramasamy,V. M, Kanagasabapathy and T. Nagarajan 36

*5. Positron Annihilation in Polycrystalline CaF, and

CdF : T. Nagarajan and S. Ramasamy 37

6. Auger Studies of Transition Metal Oxides :

D. D. Sarma, M.S. Hegde and C. N.R. Rao 39

7. X-ray Absorption Study of 5d States and Chemical

Shift of L2 and L- Discontinuities of Eu (Z * 63)in some Organic Complex : Dhanesh Jain,

K. B. Garg and B. K. Sharma 42

+8. Dynamic Spin Susceptibility of an Interacting

Electron Gas : S. K. Chowdhury and S, P. Mohanty • 45

+9. Screening of a Static Charge in Electron Liquid :

R. P. Singh and M. Yussouff 49

+10. Life Time Effects on the Study of Dynamic Structure

Factor of an Electron Liquid : B. K. Rao,S. S. Mandal. and D. N. Tripathy. 52

+11. An Indication of a New Mode of Collective Excitations

in a Many Electron. System : D. N. Tripathy,R.K. Pal and S. S. Mandal. 56

+ 12, Electron Correlations in Classical Plasma :

G. S. Dubey and B.K. Chaturvedi. 61

+13. Influence of Electron Exchange Energy on X-rayFlasmon Scattering by Solids : K. S. Srivastava,D. K. Harsh and V. Kumar. 64

(Papers 8 to 13 were rapporteured byOr. P. Bhattacharyya).

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Page

14. Comments on the Nature of Effective Interactions

between Two Plasmons : S. S. Mandal and

D. N. Tripathi. 67

+15, Theoretical and Experimental Study of Electronic

Structure of Oi -Zr : Y. K. Vohra, S. K. Sikka and

R. Chidambaram. 70

+ 16. Band Structure of Vanadium : K. R. K. Gandhi

and R. M. Singru, 77

+17. Relativistic Energy Bands of Indium by RKKRZ

Method : J. Chowdhury, P. Chatterjee and

S. Chatterjee. 77

+ 18. Band Structure and Superconductivity of Technetium :

R. Asokamani, K. Iyakutti and V. Devanathan, 80

+ 19. Study on the Effect of Correlation in Bandstructure

of Metals : K. Iyakutti, R. Asokamani and

V. Devanathan. 83

+20. Correlation of Band Structure of Cobalt with K-

Absorption Spectra : B. D. Shrivastava and

N. K. Mahajan. 86

+21. Electron Energy Bands of Some Ag-Cd Alloys :

N. C. Debnath, M. Raychowdhuri and S. Chatterjee. 89

+22. Electronic States in s-d Model with Realistic Hybridi¬

zation : S.K. Ghatak and R. K. Moitra. 92

(Papers 15-22 were rapporteured by

Dr. G. Mukhopadhyay).

23. Magnetic Hyperfine Field in Ferromagnetic Nickel

Metal : N. C. Mohapatra and T. P. Das. 95

24. On the Quantum Mechanics of Electrons in a

Magnetic Field : Some New Results : R. Ray.

25. Non-Perturbative Approach to the Coupled Electron-

Optical Phonon System : T. K. Mitra and S. Dhar.

98

102

*26. Equation of State of Thorium : B. K. Godwal,

S.K. Sikka and R. Chidambaram. 1°5

IV-

Page

+27. Measurement ot Traps at the GaAa - Native

Oxide Interface by Transient CapacitanceTechnique : B. M. Arora, S, S. Awade and

A.M. Naraale. 106

+28. Measurement of Capture Cross Section of peepLevel Impurities in F-n Junctions :

V. Kalyanraman and Vikram Kumar. 110

+29. Effect of TQ Anomaly on Large Area SchottkyBarrier Diodes : G. S. Viawaswaran and

R, Sharan, 114

+30. Formation of Surface- States : S. P. Singh,S. S. Kushwaha and Keshaw Singh 117

+31. The Effect of Temperature on the MOS Photo-

capacitance Peak : M. Mohan Chandra and

•>' a Suryan. 120

+32. Effects of U-V Radiation on Oxidised Silicon

Surfaces and Planar Devices : S.K. Singh,R.S. Srivastava and Keshaw Singh 124

(Papers 27-32 were rapporteured byDr.K. C* Rustagi).

*33. Phoiocapacitance Studies in Schottky Diodes :

R.N, Sreenath and M. Mohan Chandra. 128

*34. Impurity States in GaP : M. Robert Singh and

S. Balasubramanian. 129

*35. Structural Studies of Indium Telluride Films

Formed at High Temperatures : D. V. K. Sastryand P. Jayaraman Reddy. 130

*36. A Study of Surface Properties of Tin Doped Gallium

Arsenide at High Frequencies : V.K. Farkya,Devendra Singh and N. L. ForwaL 131

*37. Parametric Excitation of Acousto Helicon Waves

in Piesoelectric Semiconductors i S. Guha,

P.K. Sen and S. sGhosh. 132

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Page

*38. Oscillating Two-Stream Instability in a Two-

Hole Species Semiconductor : S. Guha,

P. K. Sen and S. Ghosh. 133

*39. Modulational Instability oi a Laser Beam in a

Piezo Electric Semiconductor : S. Guha, P. K. Sen

and S. Ghosh. 134

*40. Studies on the Doping of Silicon with Phosphorus

Through Nuclear Transmutation : O. P. Nangia. 135

*41. Temperature Dependence of Field Effect inMOS

Structures : C. P. Sridhar and J. Majhi. 137

"42. Modification of Silicon Surface Using Ion-Beam

Techniques and It's Properties : A. D. Yadav and

M. C. Joshi. 138

"43. Spectral Response of Schottky Barrier Solar

Cells : C. Francis Xavier and G.A. Savari Raj. 141

"44. Numerical Analysis of Silicon PN Junction Solar

Cell : P. Caleb Dhanasekaran and B. S. V. Gopalam. 144

"45. The Effect of Hydrostatic Pressure On the Capaci¬tance - Voltage Characteristics of p-n

Junctions : K. V. Ramana Rao and M. Mohan Chandra. 147

"46. Microwave Conductivity of n-Type Germanium in

the Presence of Instability : S. Guha and N. Apte. 150

"47. Electronic and Optical Properties of Crystallineand Amorphous Si and Ge : M. Nandi and

S. Chatterjee. 153

"48. Photoemissive Quantum Yield for Semiconducting

Thin Films : C. Ghosh and B. P. Varma. 156

"49. Theoretical Calculations of Silicon Surface

Structures : John Ridgway and M. L. Sheela. 159

"50. Electronic Dielectric Constant of IH-V Semi¬

conductors : J.K. Sharma and D. C. Khan. 162

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Pan

"51. Semiconducting Properties of Low-Dimensional

Poly-Iodine Chain Complexes : A. K. T. Oza,

A. K. Bandyopadhyay and S. V. Subramanyam. 165

"52. Electrical Resistivity of Low- Dimensional Poly-

iodine Chain Complexes Upto Eighty Kilobar

Pressure : A. K. T. Oza, A. K. Bandyopadhyayand S, V. Subramanyam. 168

"53. Temperature Gradients of Energy Gaps of

Degenerate Semiconductors : D. K. Roy and

R. Y. Thakur. 171

"54. Dielectric Screening in GaP : M, Robert Singh

and S. Balasubramanian. 175

"55. Helicity and Heteroatomic Effect on the Energy

Band Structure of One-Dimensional Conductor (SN) :

S. C. Mathur and S. Mitra."

178

"56. Excess Electron and Excess Hole Mobilities of

s-Tetrazine. A Candidate Material for Organic

Photovoltaic Systems : S. C. Mathur, Keys Royand B. Kumar. 181

"57. Exciton Dissociation at Phthalocyanine - Iodine

Interfaces : S. C. Mathur and S. Mitra, 184

"58. A Simple Method of Preparing ZnO Films on

Glass : T. K. Chaudhuri, H.N. Bose and

H.N. Acharya. 187

59. PTCR Effect in Barium-Strontium Titanate Doped

with Lanthanum : N. Hebbare. M. J. Patni and

C. Srinivasan. 190

60. Electrical Conductivity and MicrohardneBS of

Single Crystals of Different Materials :

J. R. Pandya and C. T. Acharaya. 193

61. Electrical Properties of Synthetic and Natural

Calcite Crystals : S. Krishnan, F. D, Gnanam,

P. Ramasamy and G. S. Laddha, 198

- vii-

62. Electrical Resistivity Variation with Field of

some Ferroelectric Perovskite Crystals :

K. R. Bagree, D. A. Deshpande and V. G. Kher. 202

63. Electrical Properties of NiS04' 6H O Crystals :

Pushpa Nandi. D. A. Deshpande and V. G. Kher. 206

64. On Electrical Resistivity of Alkali Metals :

J. P. Dixit and K. N. Mehrotra. 210

65. Spontaneous Electric Current from a Sandwich

Cell Made of Metal Electrodes and the Endocarpof Citrus Fruits : P. K. C. Plllai and M. Mollah. 213

66. Electrical Condajifcivity of Zinc Phosphide :

K. R. Murali and D. R. Rao. 217

67. Electrical Resistivity of Thin Bismuth Films :

Kazi A. Motakabbir and S. M. M. R. Chowdhury. 221

68. Planar Hall Effect in Bismuth Films : Samir

Bhattacharyya and V. Javaraman. 224

69. Electromigration Failure in Silicon Planar Devices : 228

Beniere F. and Viswanatha Reddv K.

70. Thermally Stimulated Depolarisation Currents in

Amorphous AS2S3 Materials : M. Datta, P. N. Baneriee

and D. L. Bhattacharya. 232

*71. Electrical Breakdown in Thin As2S3 Films :

P.N. Banerjee, M. Datta and D. L. Bhattacharya. 236

*72, Tunnelling Probability Across a Schottky Barrier :

D. K. Roy and P. N. Singh. 237

*73. On the Limits of Resolution of Field Emission and

Ion Micorscopes : D. K. Roy and P.N. Roy. 239

*74. Effect of Heat-Treatment on the Photosensitivity of

PbSe Films : Swapin K. Datta, A.K. Chaudhury

and H.N. Bose. 240

*75. Applicability of Band Model to P. Benzoquinone :

S. C. Mathur, S. Kumar and Keys Roy. 241

"-V11.1-

PMe*76. Study of Photodielectric Effect in Pure ZnTe :

P. K. C. Pillai and Shobha Chanderasekhar. 242

*77. Studies on the SDR IMPATT Diode Made of GaP

B. B. Pal and D.N. Datta. 244

*78. Effect of AC and DC Electric Fields on CaS04 :

Sm Samples : S. G. Sabnis, M. R. Mulla,-

R. D. Lawangar and S. H. Pawar. 245

*79. Field Assisted Conduction Mechanism in Tellurium

Dioxide Films : D. K. Jain and J. C. Garg, 246

*80. Depolarlsation Current Studies at High Tempera¬ture and Low Fields : P. G. Mehendru, K. Jain

and N. P. Gupta. 247

*81. Studies of Charge Storage Mechanism in PVB Thin

Films : Naresh Kumar, K. Jain and P. C. Mehendru. 249

*82. Hysteresis in Bi203 Capacitors ; S. Singh,

V.K, Saxena, S.'L. Pandey and R. N. Sax.s!na. 250

*83. Thickness Dependence of Breakdown Field in

Evaporated Stearic Acid .Film Capacitors :

R. Kasilingam, C. Balasubramanian and

M. Radhakrlshnan. 251

*84. Thickness Dependence of Thermoelectric Effect

in Thin Cu-Ni" Films : M.A, Angadi and

A.M. Karaguppikar. 252

*85. Thermoelectric Effect in CaSO. : Dy :

S. H. Pawar, S. H. Jagdale, C.N. Jadhav,A. G. Shikalgar and B. B. Bargale. 253

*86. Grain Size and Grain Density Variation in Tin

Thin Films aue to Changes in Deposition Rate

and Vacuum during Deposition : V. Damodaradas. 254

*87. Electrical Resistivity Study of Some Gallium -

Manganese Spinels: P. D. Bhalerao and

V. M. Gokhale. 256

*88. Temperature Variation of the Barrier Parameters

in Al-AUOj-Al Tunnel Junction at Low Voltages :

M. S. Jagadeesh and Damodara V. Das. 25S

-ix~ ii££.

*89. Effect of Band-Filling on the Dimerization o£ a

One-Dimensional Metallic Chain : S. Chatterjee. .259

*90. Electrical Properties of Mannich Base Poly¬mers : P. S. Viswanathan, K. L. Taneja and

Padma Vasudevan. 260

*91. Electrical Properties of HgO : P. K. C. Pillai

and Shobha Chanderasekhar."

262

*92. Effect on IN-SITU Annealing on Optical and

Electrical Properties of MnBi Films : P. C. Achar

and R.N. Karekar. 264

*93. Electrical Conductivity of Coper Oxide Thin Films

at Microwave Frequency : A. U. Patll, S. R. Sawant,

J.I. Powar, A. Y. Khot and R.N. Patil. 266

*94. Annealing Study of Electrical Resistance and the

Variation of Defect Density with Deposition Rate

in Silver Films : K. Narayaadas, M.. Radha-

krishnan and C. Balasubramanian. 267

*95. Electrical Properties of Bi? O, Layers Under

Reduced Pressure : S. L. Fandey, S. Singh and

R.N. Saxena. 268

*96. Deposition Temperaure Effect on the Electrical

Properties of Tin Films : M. Ranganatham Chetty,

M.K. Sundaram and S. Mohan. 269

*97. Energy Gap Variation with Thickness in Vacuum-

Deposited Cadmium Tellurlde Thin Films :

V. Damodara Das and N. Jayaprakash. 270

*98. Low Temperature Electrical Conductivity of Tin

Films Vacuum-Deposited at Liquid Nitrogen

Temperature : V. Damodara Das and N. Jayaprakash. 272

+99. Preparation of Thin Bi O Films by Controlled

Oxidation and Measurement of Their Microwave

Transmission and Reflection Coefficients :

A. M. Fegade and R. N. Karekar. 273

JEaga.

*100. Effect of Pressure on the Electrical Resisti>-

vities of Some Ternary Rare Earth Compounds :

V. Vijaya Kumar, E. V. Sampatkumaran and

S. N. Vaidya. 275

101. R. F. and Microwave Behaviour of the Dielectric

Properties of the Single Crystal Double Sulphates :

'O.-S. Josyulu, B, Jayaram and J. Sobhanadri. 276

102. Effect of Pressure on Pyroelectric Property of

Poly (Vinylidene Fluoride) : .H. V. Tiwary and

J. C. Burfoot. 280

103. Anomalous Electrical Conductivity of Ferroelectric

Poly (Vinylidene Fluoride) : G. D. Sao and

H. V. Tiwary. 284

*104. Can Phthalocyanlnes be Pyroelectric? :

H. V. Tiwary and J. C. B.urfoot, 288

#105. Electrical Conductivity of Ammonium Selenate

Single Crystals : K. P. Sarabhai and H. V. Tiwari. 290

*106. Growth and Some Dielectric Properties of Pure

and Dopped TGS Crystals : A. K. Batra, S. C. Mathur

and A. Mansingh. 292

*107. Effect of Ortho, Meta - and Para-Nitroaniline

Admixtures on Dielectric Properties of TGS

Crystals : A. K, Batra, S, C, Mathur and

A. Mansingh. 294

*108. Dielectric Properties of Tin(Sn) Doped KC1 :

B. S. Acharya and M. L. Mukherjee. 295

*109. Dielectric Loss in RbCl Mono Crystals Dopedwith Co2+ Ions : S. K. Gupta and S. D. Pandey. 299

*110. The Effect of Thickness on the Dielectric Proper¬ties of Lanthanum Oxide Thin Films :

T. Mahalingam, M. Radhakrishnan and

C. Balasubramanian. 301

*111. Electrical Conductivity in Potassium Nitrate :

N. Hariharan and C. Satyamurthy. 303

-xi-

HI. OPTICAL PROPERTIES OF SOLIDS

"I. Isothermal Stability of Colour Centres in Micro

crystalline Ca Doped KC1 : V. S. Kamavisdarand B. T. Deshmukh.

"2. Effect of Particle Size on Isothermal Decay of

Colour Centres of V -Irradiated KBr :

D. G. Wakde, S. V. Mohril and B. T. Deshmukh.

"3. Optical Absorption Studies on Suprapure and

Calcium Doped Single Crystals of RbCl ;

S. B. S. Sastry and S. Sapru.

"4. Radiation Damage Studies on CrO., DopedAlums : B. V. R. Chowdari and V. Ravi Sekhar.

"5. Negative Molecular Sulphur Ion Centres in

Cesium Bromide ': S. Radhakrishna and

K. Hariharan.

"6. The Pressure Derivative of the High FrequencyDielectric Constant of Alkali Halide Crystals :

Lalit K, Banerjee and A. N. Basu.

"7. Quadratic Electro-Optic Effect (Kerr Effect) in

Doped KCL Crystals : Geetha Balakrishnan and

K. Srinivasan.

"8. Dipolar Coupling in NH3 and ND3 Crystals :

P. Muthusubramanian and N. Krishnamurthy.

+9. A Comparative Study of the Infrared Spectra of

Optical Phonons in (NH4), Mil (S04),, 6H20 (MCo, Ni, Mg) : S. P. Gupfa, • B. SingE,P.N. Asthana and B.N. Khanna.

+10. The Vibrational Spectra of SrXg. 6H20 (X = CI,

Br) : B. Singh, S. P. Gupta and B.N.Khanna.

+11. The Dynamics of Sulfate and Water Units in

CuS04. 5H,0 and its Deuterated Analogue :

B. K. Srivastava and D. P.Khandelwal.

-Xll- Page

+ 12. Absorption Studies of Vanadyl Ion in

K C O .H O : S. Radhakrishna and M. Salagram. 339

+13. Crystal Dynamics and IR Spectra of Barium

Bromide Dihydrate : B. Singh, B.N. Khanna

and Y. S. Jain. 342

+14. Infrared Absorption of Aphthitallte, KNaSO :

S. Alam and J. P. Srivastava. 345

(Papers 9-14 were rapporteured by Dr. Y. S. Jain)

*15. Structure of the A Band in Thallium DopedAmmonium Chloride : V. B. Sharan, D. N. S.

Srivastwa and S. C. Sen. 348

16. Exciton - Exciton Interaction in CdS : S. M. Oak. 349

17. Effect of Particle-Hole Excitations in the

Absorption Spectra of Thin Metal Films :

G. Mukhopadhyay and S. Lundqvist.

18. On the Excitonic Absorption in CdS :

G. Mukhopadhyay. 355

19. Effect of Spatial Dispersion on the Optical Propertiesof Solids : G. Mukhopadhyay. 359

*20. Structural Optical and Electrical Properties of

Thin CdSe Films : R. Thangaraj, F. K. Tewari,

A.K. Sharma, B. K. Gupta, O. P. Agnihotri and

S.S. Mathur. 362

*21. Electroluminescence of SrS : Cu:Zr Phosphors :

D. P. Kulkarni, S. S. Kaveeshwar, P. S. Cbowdharyand P. C. Kamara. 363

*22. Enhancement of Red Emission of ZnS : Cu, Bi.Fe :

P. D. Ekbote and J. K. Zope. 364

*23. Electro-Optic Properties of CdTe ! Ashok Kumar

and T. P. Sharma. 365

24. Thermoluminescene and Effects of Heat-Treatment of

Yellow and Colourless Fluorites : V. K. Jain and

S. Mitra. 366

-xiii-

*25. Colour Centres in LiF Single Crystals with

X- ray Irradiation : H. B. Gon.

*26. Quenched Ageing of Thin Film Deposits byChopping : R.K. Puri, K. Vijaya and

R. N. Karekar.

"27. Optical Properties of Alkali-Doped CdS Thin

Films : A. G. Shikalgar, B. B. Bargaie and

S. H. Pawar.

"28. Photothermoelectric Effect in Chemically

Deposited CdS Thin Films : B. B. Bargaie,A. G. Shikalgar and S. H, Pawar.

"29. Effect of Air Baking and Substrate on the Photo¬

sensitivity of PbTe Films A, Vijaya Kumar and

A. K. Chaudhuri. 376

"30. Photoconduction in Anthraquinone Dye Thin Films :

M. R. Padhye, T. S. Varadarajan and L. N. Chaturvedi 379

"31. A "Photoconductlve Film- for Vidicon Target:R. C. Bapna and B. P. Varma. , 382

"32. Defect Formation in CdS : Cu due to Electron-

less Discharge : P. D. Ekbote, J. K. Zope, 385

"33. Measurement of Surface Roughness Using Return-

Path Ellipsometer : C. E. Sooriamoorthy. 387

"34. Multiple Beam Interferometic Studies of Percussion

Figures on (100) Cleavage Planes of Single Cristals

of Sodium Bromide : M. H. Ansari and S. C. Datt. 390

"35. Electrical Conductivity of Superionic Solid

Rb Ag4_xCu Ig Films : K. Hariharan. 394

"36. Electronic Spectra of Superionic Compound

KAg.I Films : K. Hariharan. 39764 s

IV. DYNAMICAL AND THERMAL PROPERTIES OF

SOLIDS AND LIQUIDS .

+ 1. A Theory of Nematic to Isotonic Transition in

Liquid Crystals Forming Dimers : V. K. Kelkar,

C. Manohar and J. V. Yakhmi. 400

Page

367

368

369

373

-XIV-

Page

Tilt Angle Measurements in the Smectic C (Sc)and Nematic (N) Phases of HxBABA and NBABA :

K. Usha Deniz, A. S. Paranjpe, P. S. Parvatha-

nathan and E. B. Mirza. 404

Electric Field Induced Instabilities in MBBA :

K. Usha Deniz, P. S. Parvathanathan and

A. S. Paranjpe. 407

Positron Lifetime Studies in the Various Phases

of the Liquid Crystal Cholesteryl Oleyl Carbonate :

M. B. Kurup, R. P. Sharma and B. V. Thosar. 411

Mossbauer Investigations in a Liquid Crystal at Low

Temperatures : R. P. Sharma, M. B. Kurup and

B. V. Thosar. 414

Molecular Motion in the Solid Phase Nematic Liquid

Crystal: G. K. Gupta, V. P. Arora, V. K, Agarwaland A. Mansingh. 417

Structure of the Smectic Phase of 4'-(N (P-Fentyloxy-carbonyl, Oxybenzylidene) Amino) Valerophenone :

B. Bhattacharjee, A. Zeminder and S. Paul. 420

(Papers 1-7 were rapporteured by Dr. C. Manohar)

Elucidation of Structural Parameters of Solid Hydrated

Soaps Trhough X-ray Diffraction :M. K. Nagarajan and

R. P. Angadi. 423

EPR Study of the Temperature Dependence of

Molecular Alignment in a Smectic Liquid Crystal :

V. G. Bhide, S. K. Gupta and S. R. Singhal. 126

A New Approach to the Calculation of the Order

Parameter of Nematic Liquid Crystals : Ranjlt Paul 428

SAXS Study on the Damaging Effect of 1% Hard

Water on Macromolecular Parameters of Proeinous

Tussah Silk Fiber : A. Patel. 429

The X-ray Crystallinity and Orientation of Indian

Silk : N. V. Bhat, G. S. Nadiger and A, Venkatraman. 431

-XV-

Pag

*13. Dielectric Relaxation Behaviour in Two Compo¬

nent System : A. K. Sharma and V. K. Agarwal. 434

*14. Origin of Ultrasonic Absorption in Liquid .-Ukali

Metals : O. N. Awasthi and S. Sathish. 435

*1.5. Ultrasonic Attenuation in Single Crystal Alumi¬

nium : M. Subramanyam and V. Padmanabha Sarma. 436

"16. Lattice Dynamics of (NH.) CuCl4"2(H20) :

S. L. Chaplot and V. C. Sa^ini. 437

"17. Translational Fhonons Dynamics of ND41 in the

NaCl Phase at Room Temperature : A. N. Pandeyand K. S. Upadhyaya. 440

"18. Second Order Doppler Shift for Dislocations

Produced by Impurity Radiating Nucleus : Debadideb

Bhattacharya, S. K. Roy and D. L, Bhattacharya. 443

"19. Concentration Dependence of the Mixed CrystalBehaviour : A CPA Theory : P. Nayak and

S.N. Behera. 446

"20. Oscillations in Pair Mode Frequencies and the

Width of Impurity Modes : S.N. Behera and

N. Chandralekha Devi. 450

"21. Elastic Constants of the NaCl Structure Crystals

Containing Impurity Ions : R. Sebastian and

G.A. Savari Raj. 453

"22. The Third Order Elastic Moduli of Aluminium

Magnesium Alloys : V. Kesava Raju and

P, Jayarama Reddy. 456

"23. Study of the First Order Pressure Derivative of

the Bulk Modulus of Rare Gas Solids : Sushma Lehri

and M. P. Verma. 459

• "24. Methods of Homogeneous Deformation for Elastic

Constants of Metals t D. Sen, S. K. Sarkar,

S.K. Das, D. Roy and S. Sengupta. 462

"25. A New Approach to Estimate the Coupling Constant

Using Mossbauer Data : Deo Raj.

- XVI-

"26. Effect of Volume Forces on Lattice Dynamicsof Transition-Metal Corabides : H.N. Gupta

and R. S. Upadhyaya. 468

"27. Role of Three-Body Forces in Lattice Dynamicsof Neodyium Antimonide : H. N. Gupta and Kanti

Chandra. 471

"28. Dielectric Constant of Pbl2 .Single Crystals :

D. P. Yadav, K. V. Rao and H\ N. Acharya, 474

*29. Spin-Phonon Scattering in ErVO in ParamagneticPhase : V. P. Srivastava and G*S. Verma. 477

*30. Defect Modes due to H_- H_ and D -D Pair

Impurities in KCl : R. K. Gupta, P. Mathur and

A.K. Singh. 478

*31. Third-Order Elastic Constants of Copper, Silver

and Gold : B. P. Barua and S.K. Sinha. 479

*32. Energy Contributions to. the Second-Order Shear

Elastic Constants of Dilute Au-Ni Alloys :

B.P. Barua and S.K, Sinha. 481

*33. Many-Body Effects on the Second Order Elastic

Constants of Solids with the CaF2 Structure :

S. S, Bedi and M. P. Verma. 482

*34. Lattice Solitons in a Diatomic Chain : P. C, Dash

and K. Patnaik. 483

*35. Inter-Ionic Pair Potential : Exchange and

Correlation Effect : P. L. Srivastava,R. Chaudhary and J, R. Singh. 484

36. Phonon Conductivity of p-Type Semiconductors for

Random Strains : Surendra Singh and G. S. Verma. 485

37. Anomalous Effects of the Magnetic Field on the

Phonon Conductivity of Lightly Doped N-TypeSemiconductors : Surendra Singh and G.S. Verma. 488

38. Phonon Scattering by Holes in Doped GaAs :

M. Singh. (Presented by Surinder Singh) 491

-XV11-

Electron-Phonon Scattering in Zn-Doped GaSb :

V. Radhakrishnan and P. C. Sharma. 494

Relaxation Rate for Phonon Scattering by Point

Defects Under Anharmonic Crystal Fields :

V. Radhakrishnan and P. C. Sharma. 497

Thermal Desorption of Lanthanum Hexaboride from

Tungsten Surface Using Field Emission Micro¬

scopy : C. V. Dharmadhikari, D. S. Joag and

P. L. Kanitkar. 500

Studies on the Gettering Action of YF, : U.Kumar,

Satyandra K. Agarwal, N. L Singh and A. K. Nigam, 503

Scattering of Phonons by Cluster Defects :

Y. P. Joshi. 504

Density-Fluctuation-Limited Phonon Mean Free Path

in Amorphous Solids : Y. P. Joshi and D. P. Singh. 509

Effect of X-ray Irradiation on Thermal Expansion of

KCl Single Crystals : A. K. Gupta. A. Subrahmanyam

and K. V. Rao. 513

Temperature Dependence of Thermal Expansionand Debye Temperature of KBr : KCl Solid

Solution by X- ray Diffraction : N. M. Pandya,B. P. Agarwal and N. P. Shah. 515

MAGNETIC PROPERTIES OF SOLIDS

A New Approach to Electron Localization in Dis¬

ordered Systems : R. S. Tripathi. 516

Electronic Density of States of a Binary Alloy in a

Cubic Lattice Including the Effects of Diagonak and

Off-diagonal Disorder : P. Chaudhuri and

R.K. Moitra. 519

On the Fermi Level of System with NegativeCorrelation : C. R. Natoli, B. K. Chakraverty

and S.K. Ghatak. 522

-XVIXX- Zage

Local Environmental Effects in the Coherent

Pseudopotential Approximation : Meena

Chaturvedl, Vipin Srivastava and S.K. Joshi. 525

Application of Multiband CPA to the Ferro¬

magnetic Ni Ru.0

' Alloy : R. Chakravarthy,

P. Chaddah and L. Madhav Rao. 529

Magnetic Susceptibility of Elemental Amorphous

Semiconductors : N. C. Das. 532

Effect of Fluctuations on the Order Parameter and

the Transition Temp, in Spin Glasses : Satish K. Das

and S.K. Joshi.'

- 535

Critical Properties of the Dilute Heisenberg Magnet :

M. Berma, D. Kumar and R. B. Pandey. 538

(Papers 1-8 were rapporteured by Dr. Vipin Srivastava)

Evidence for a Spectrum of Freezing Temperatures

in a Cluster Spin Glass System ; A. K, Grover.

C. Radhakrishnamurthy, S. K. Malik and

R. Vijayaraghavan. 542

Mixed RareEarth Intermatelics - Ideal Spin Glass

Systems? : A. K. Grover. S.K. Dhar, S.K. Malik

and R. Vijayaraghavan. 546

Cusps in Low Field AC Susceptibility of Ferro¬

magnetic Heusler Alloys : S.K. Dhar, A. K. Grover,

S. K. Malik and R. Vijayaraghavan, 549

Sensitivity of the Curie Temperature to Single Ion

Anisotropy ;, R. Brahmachari and

K. G. Chakraborty. 552

Critical Properties of Spin One Biquadratic XY

Model : G. Chaddha. 555

AB Initio Calculation of Exchange Enhanced Susce¬

ptibility of Alkali Metals : S.K. Misra and

P.K. Misra. 558

-^lX-Page

+15. Chemical-Bond Approach to the Magnetic Suscepti¬bility of Tetrahedral Semiconductors : T. Sahu

and P. K. Misra. 562

+ 16. Magnetic Susceptibility o£ Doped Narrow-GapSemiconductors : G. S. Tripathi and P. K. Misra. 566

+ 17. Temperature Dependence of Magnetic Suscepti¬bility in Nickel : Ramjit Singh, Joginder Singh and

Satya Prakash. 570

(Papers 12 to 17 were rapporteured by Dr. P. Rudra)

18. Hyperfine Interactions in Rare Earth Iron

Oxides by Mossbauer Effect Method : A. Narayanasamy,T. Nagarajan, P. Muthukumarasamy and

N. Kimizuka, 574

*19. Mossbauer Studies on Ni„ Cu, Fe„0, Spinelx i-x 2 4

System : P. Muthukumarasamy,T. Nagarajan and A. Narayanasamy. 577

=1=20. Mossbauer Studies on Disordered Binary Alloys :

A. Narayanasamy, T. Nagarajan, P. Muthu¬

kumarasamy and T. S. Radhakrishnan, 578

21. Measurement of Quadrupole Splitting in Some

Non Cubic Iron Based Alloys : V. Anila,

H. C. Verma, D. K. Gupta and G.N. Rao. 579

57 -•

22. Study of Quadrupole Interaction at Fe in Zir¬

conium Metal : H. C. Verma and G. N. Rao. 583

23. Measurement of Quadrupole Interaction

Frequencies (QIF) of 5'Fe in Non-Cubic Host

Metals : V. Anila, H. C. Verma, D.K. Gupta

and G.N. Rao. 583

24. Study of Quadrupole Interaction in Ferrite Spinel

CdFe O : S. H. Devare and H. G. Devare. 5882 4

181*25, Quadrupole Interaction at.. Ta in Te Metal :

S. H. Devare and H. G. Devare. 590

-XX-

*26. Magnetic Susceptibilities of RFe O Systems

(R = Ho, Er, Tm, Yb, 2Y, Luf2 : Paul

Baynes, B. Viswanathan, A, Narayanasamy,

N. Kimizuka, N. K. Appanraj and

T. Nagarajan. 592

"27. Ferromagnetic Form Factor in the Canted

Antiferromagnet YbFe_ gjCo ggC>3 :

S.K. Paranjpe and R.'j. Begum, 593

"28. Exchange Constants in Yttrium and Gaddlinium

Garnets : R. Aiyar and C. Srinivasan. 595

"29. Study of Spin-Wave Line-Width of Yttrium

Aluminium Garnets : Om Prakash,

G. Srinivasan and C. M. Srivastava. 599

"30, Low D imensional Magnetic' Behaviour of some

Metal Oxides with K2 NiF4 Structure :

P. Ganguly, S. Koilali and C. N. R. Rao. 603

"31. Magnetic Thermal and Hyperflne Properties of

Ho^+ Ion in Hexagonal Sites in LaCl, : D. Neogy and

A. Chatterji. 607

"32. Magnetic Measurement on Ytterbium Selenate

Octahydrate and a Theoretical Study of its Magneticand Thermal Behaviour : D. Neogy and J. Nandi, 610

3+"33. A Study of the Behaviour of Nd Ion in Lead

Molybdate : D. Neogy and J. Nandi. 613

"34. Electrical Resistivity of Au._ Cu Alloys with Fe

Impurities at Low Temperatures : Girish Chandra,A. W. Shaikh and CM. Srivastava. 616

"35. Hyperfine Studies of Site Occupation in Co.,FeAl and

Fe2CoAl : A. K. Grover, R, G. PiUay, V. Nagarajanand P.N. Tandon. 619

"36. Mossbauer and NMR Studies in FerromagneticRh2MnPb : R. G. PiUay, A.K. Grover, P.N. Tandon

and Le Dang Khoi. 622

"37. NMR Studies on the Antiferromagnetic EuB3 :

M, M. Bajaj and M, Kasaya. 625

-XXX-

Photomagnetic Susceptibility in Bismuth-

Activated CaSO Samples : M. R. Mulla,S. G. Sabais and S. H. Pawar.

Pag

629

Low Temperature Mossbauer Study of Zn Fe-, 0.

System : CM. Srivastava, S. N. Shringi and

M. Vijaya Babu. 632

Mossbauer and Magnetic Susceptibility Studies of

FeQ M Sn/M= Fe, Mn, Co and Nl :

S.K. Kulshreshtha and P. Raj. (Presented byN.K. Jaggi) 637

Experimental Investigation 'of some Coordination

Complexes Using the Eu^l Mossbauer Resonance :

Asharfi Lai. K. Rama Reddy, Arvind and Naseer

Ahmad, 641

Mossbauer Study of Some Trinuclear Iron (III)Benzoate Complexes : D. C, Gupta • N. Nath and

D. M. Puri. (Presented by D.K. Kaushik) 645

Mossbauer Study of Gamma-Induced Polymerisationof Iron Methacrylate : P. R. Sarma. K. C Tripathiand H. M. Gupta. 648

57Resonance Studies of Vacancy Trapeed Fe

Impurity in Solid Solution : Arun K. Tewari,S. K. Roy and D. L, Bhattacharya. 651

Frequency Shift of the Resonance Line for Cubic

Metals Containing Substitutional Impurities :

Arun K. Tewari, S.K. Roy and D. L. Bhattacharya. 652

57Mossbauer Spectra of Co Doped Lanthanum Hexa-

boride : P. S. Joag and A S. Nigavekar. 653

On the Distortion of Fe Octahedra in Mana-

gaaophyllite : R. P. Tr-rpathi, Anjali, Krishna-

murthy and S. Lokanathan. 655

EPR Study of Cu2+ Doped Zinc Malonate Dihydrate :

S. Ojha, K. K. Surendran, R. Rajan, K, V. Lingam

and B.N. Bhattacharya. 656

-xxii-

Page

49, EPR Study of VO Doped Zinc Malonate Dihy-

ydrate : S. Ojha, R. Rajan, K. V. Lingam and

B. N. Bhattacharya. 660

2+

*50. Temperature Dependent ESR of MnTin Zinc Tris-

Ethylenedlamine Nitrate : S. G. Sastry, M. J. Rao,

K. V. Lingam and B. N. Bhattacharya. 663

*51. ESR of Cu in Cadmium Tris-Ethylenediamine

Chloride-A Possible Case of Compressed Octa¬

hedron : S, G. Sastry, M. J. Rao, K. V. Lingam

and B. N. Bhattacharya. 664

*52. NOZ+ Radical : ESR Study in Irradiated Rubidium

Uranyl nitrate : M. V. V. S. Reddy, T. K. Gundu Rao,

K. V. Lingam, M.J. Rao and B.N. Bhattacharya. 666

#53. ESR Study of Mn++ Doped in Cadmium (Imidazole).

(NO )2 : R. K. Sharma, K. V. Lingam, M.J. Rao

and B.N. Bhattacharya. 668

#54, Paramagnetic Resonance Studies of a DifferentiallyColoured Gamma-Irradiated Natural Quartz Crystal :

Harish Bahadur and R. Paxshad, 669

*55. Study of the Paramagnetic Species of Gamma

Irradiated Chloramphenicol : Bijay Bal,

A,K. Roy and Soumen Sarkar. 671

*56. Electronic Structure of Radiation Damage Centre in

Zinc Silicate from ESR Hyperfine Data : C Prasad

and Sulata Chakravarty, 672

57. Proton Spin Lattice Relaxation Studies in Lithium

Ammonium Sulfate, LiNH.S04 : R. K. Shenoy and

J. Ramakrishna. 673

58. Proton Spin Lattice Relaxation Investigations in Sodium

Ammonium Selenate Dihydrate : R. K. Shenoy and

J. Ramakrishna. 676

*59. Nuclear Quadrupole Resonance in 2, 5 Dichloro-

phenol Study of Intramolecular Hydrogen Bonding :

A. Indumathy and J. Ramakrishna. 678

-xxiix-

Page

*60, Bromine Nuclear Quadrupole Resonance of Cyclo-phosphazene Derivatives : R. K. Sridharan,J. Ramakrishna, S. S, Krishnamurthy and

M. N, Sudheendra Rao. 679

*6l. Observation of a Phase Transition ; NQR in

3, 5-Dichloropyridine : S, P. Basavaraju, N. Devaraj,K.R. Sridharan and J. Ramakrishna. 680

35*62. Effect of Impurity on CI NQR in Potassium

Chlorates : S, Aithal, J. Uchil and D. L. R. Setty. 682

*63. Nuclear Quadrupole Resonance in 4, 2-Chloronitro-

toluens : J. Uchji, S. Aithal and D. L. R. Setty. 683

79*64. A Zeeman Study of 7Br NQR Line in Cadmium

Brornate DLhydrate : R. Valli and K. V. S. Rama Rao 685

*65. 59Co NMR Study of Na Co(NO) : M. Bose,

A. Ghosh Roy, A. Basu and K. Roy. 687

*66, llB NMR Studies of Some Rare-Earth Hexaborides :

M. Bose, K. Roy and A. Basu. 688

67. EPR Study of Hyperfine and Quadrupole Interactions

of Cu2+ in Trimethyl Ammonium Cadmium Sulphate :

K. K. Surendran, K. V. Lingam, M.J. Rao and

B.N. Bhattacharya. 689

*68. ESR of V02+ in (NH4)2 (CO) (S04)3 :

B. Jayaram, A. Kumaraswamy, N, Hariharan

and J. Sobhanadri. 692

VI. PHASE TRANSITIONS

1. Phase Transitions in the Compounds, p-n-Alkoxy-benzylidene-p-Amino Benzoic Acids :

A. S. Paranjpe, E. B. Mirza, P. S. 'Parvathanathan,A. L Mehta and K. Usha Deniz. 693

2. Determination of Symmetry and Domain Structures

in Ferroelectric Lithium Ammonium Tartrate

Monohydrate : Akhilesh Kumar Jain and

G. C. Upreti. (Presented by S. D, Pandey). 697

-XXXV-

page

3. Study of Order-Disorder Transition in Nickel-

Iron Alloys by Positron Annihilation :

S. Ramasamy, A. Narayanasamy, T. Nagarajan,

K. P. Gopinathan, C. S. Sundar and B. Viswanathan. 700

4. Infrared Spectroscopic. Study of the Phase Transi¬

tions in CSN03, RBN03 and NH4N03 : J. R. Fernandes,

Somnath Ganguly and C.N.R. Rao. 704

5. Detection of Phase Transition in Insulators by TSC

Technique : S. J. Walzade, J. P. Jog and

S. V. Bhoraskar. 708

6. Transitions in Thiourea-Formaldehyde Resins :

A Study on Electrical and Thermal Properties :

H. S. Nalwa, U. S. Tewari, K. L. Taneja and

P. Vasudevan. 712

*7. Effects of Pressure on Electrical Resistivity of

NbO and Nb02 : S.N. Vaidya, D.K. Joshi and

M. D. Karkhanavala. 715

*8. Effect of Pressure on the Critical Exponent in the

Binary Liquid System CSZ + CHjCN ; K. K. Tiwari,S. Jyothi, S. T. Lakshikumar and P.P. Krishnapur. 716

9. Gyrotropy ; V. K. Wadhawan. 717

10. Group Theoretical Analysis of Second Order Phase

Transitions in UI3 : M. K. Slkdar and P. Rudra. 720

11. Is the Universal Behaviour of Transport Coeffi¬

cient Anomaly Breaking Down in Critical Binary

Liquid Systems ? r Anil Kumar, Chandrasekhara

Shetty and E. S. R. Gopal. 723

12. Fluctuation Approach to Ultrasonic Anomaly In

VgSi : 5. Dattagupta and G. Venkataraman, 727

13. Phase Tradition and Structure Dependence of the

Potential Parameters for Group IV Elements :

A. Ghosh and A.N. Basu. 730

14. High Temperature Expansion of ThermodynamicQuantities : Y. S. T. Rao. 734

-XXV-

Page

15, Shape of the Critical Nucleus during First

Order Phase Transition ' S. Vaaudevan.

S. Nagalingam, P. Ramaswamy and G. S. Laddha. 737

VIL RADIATION AND DAMAGE STUDIES

1. Theoretical Investigation of Deviations from Statistical

Equilibrium in Planar Channelling : S. G. Gaonkar

and A. G. Wagh. 740

2. Planar Oscillations in the Energy Spectra of He

Ions Backscattered from Impurity Atoms

A. G. Wagh, J. S. Williams and E. Uggerhj. 744

3. Channeling in Thin Lead Sulphide Films :

A. G. Wagh. 746

4. Blistering and Exfoiiatinn of Zirconium, Inconel-718,

Stainless Steel-316 and Aluminium by 2 MeV He

Beam ; D. K. Sood, M. Sundararaman, S.K. Deb,

R. Krishnan and M.K. Mehta. 747

5. A New Model for Blister Exfoliation : S. K. Deb

and D.K. Sood, 748

6. Interfacial Segregation in Au-Ni Alloys : Vijay Kumar 749

7. Design, Fabrication and Performance of a 200 KeV

Ion Implantation System : S. B. Ogale, M. R. Bhiday,

A.S. Ogale and V.N. Bhoraskar. 752

*8. Some Characteristics of a Versatile Indigenous Ion

Source : G. S. Virdi, M. D. Aggarwal, V. K, Mathur,

S.K. Chattopadhyaya and Narendra Nath. 7 56

9. Proton Diffusion in Metals : S. Prakash. 757

10. Thermal Migration of Iron Implanted in Aluminium

at High Doses: V. K. Asundi, M. C. Joshi, S.K. Deb,

V. N. Kulkarni, D. K. Sood and M. Sundararaman. 761

U. Computer Simulation of Sputtering of Argon Ions from

Various Targets : R. Shanta.765

12. Small Vacancy Clusters in Mg : Lattice Static

Results by Computer Simulation : K. Krishan.

S. Srinivasan and H.K. Sahu. 768

-XXVI

Paffe

Statistical Description of Dislocation Dynamics -

Application to Creep in LiF : D. Sahoo and

G. Ananthakrishna. (Presented by V. Balakrishnan) 771

A Dislocation Model of Work Hardening - Appli¬

cation to Creep in LiF : G. Ananthakrishnan and

D. Sahoo. (Presented by V. Balakrishnan) 775

Reactive-Diffusive Model for Vacancy Contribution

to Resistivity : V. Balakrishnan and N. K. Bansal. 779

Models for Defect Production By Irradiation :

Exact Solutions and Implication of Stability, Pulsed

Irradiation and Fluctuations : K. Krishan. 7 82

Radiation Damage in Some EN Steels : Manik

Nandanpawar and S. Rajagopalan. 785

Dislocation in Crystalline Solid Studied byMossbauer Effect ; D, Bhattacharya and S, Mitra. 787

INSTRUMENTATION FOR SOLID STATE STUDIES

Thin Film Thickness Monitor Using a Dobly OsciLlat-

ing Quartz Crystal : D.K. Kaushik, S. K. Chattopadhyayaand N. Nath. 788

An Automated Rotary Crystallizer : R. Krishna-

swamy. 791

Thermoluminescence Unit for Radioactive Samplesin the Temperature Range 100-750°K : A. G. I.

Dalvi, M. D. Sastry and B. D. Joshi. 794

New Preparation Method which might Replace Hot

Pressed Garnets : N. G. Nanadikar and V. R. Palkar. 797

A Simple TecUiique for the Growth of Fluorite

Crystals and Their Whiskers : C. C Desai and

V. John. 800

Switching Characteristics of Ferroelectrics :

Ramanath Ravi, K. S. Sangunni and P. S. Narayanan. 801

-xxvxx-

Page

*7. Design of AC Cycle Controller for Measurement

of the Surge Forward Voltage Drop and TemperatureRise of Silicon Diodes : S. B. Bhosaie and

K. Ramani. 802

*8. Design and Fabrication of a Single Crystal GrowingUnit and Growth of a Zinc Single Crystal :

A. Ramchandra Reddy, B. D. Singh and

V. Venkateswar Rao. 803

9. Some Simple Industrial Applications of Mossbauer

E«ect : N. K. Jaggi and K. R. P. M. Rao. 804

*10. A Constant Velocity Mossbauer Spectrometer Free of

Long-Term Instrumental Drifts in the Count Rate :

P. R, Sarma, A. K. Sharma and K. C. Tripathi. 807

11. An Exact Solution Technique for Determining the

Dielectric and Magnetic Susceptibility of Low Loss

Microwave Materials : N. S. Hanumantharao and

M. J. Patni. 808

12. A NQR Spectrometer with AGC and Sideband

Suppression : K. Rukmani, J. Ramakrishna and

S. L. V. Chary. 811

13. A Single Klystron Superhet ESR Spectrometer for

Low Level and Low Frequency Modulation :

C. V. Manjunath, N. C Mishra, S, Sinha,

R. Srinivasan and P. Venkatarathnam. 814

14. Ratio Transformer Impedance Bridge for the

Measurement of Very Small Capacitances :

B. R. Madhu, Ramnath Ravi, H. L. Bhat and

P. S. Narayanan. 817

*15. An Inexpensive Solid State Receiver for Pulsed NMR

Spectrometer : P. Narasimha Reddy and

B, P. Nagi Reddy. 820

16. Characteristics of 5T-Superconductivity Solenoid

with Detachable Current Leads : V. Chopra,

G. Dharmadurai and N. S. Satya Murthy. 821

17. Design and Fabrication of a High Homogeneity

High Field Superconducting Magnet, a Metal Cryostat

and a High Stability Energiser at NPL : V. G. Bhide,

S. N. Ekbote, A. K.Gupta, A, V. Narlikar, R. G. Sharma,

V. S. Yadav, G. S. Swaminathan and G. S. Vaidyanathan. 824