162 Abstracts

both in respect to its composition and particle size. Examples of similar reactions for the synthesis of pyrochlor~, perovskite and stabilized zirconia phases will also be described.

Ion Exchange Reactions of Potassium Titanyl Phosphate _Riql~rfi H. Tin'man. Amoco Technology Co.,USA.

In order to modify the optical properties of potas- sium titanyi phosphate (KTiPO4), an important component in nonlinear optical systems, it is desirable to substitute the potassium ions which occupy sites in channels with windows defined by six oxygen atoms. In the course of ion-exchange reactions using molten salts containing sodium, lithium and hydrogen ions, a number of reactior~ were observed which led to compounds other than those expected from mere ion-exchange. The nature of the~e reactions is discussed in terms of the heats of formation of the compounds involved.

The Preparation and Properties of the High-Tc Superconductor Ba2Y1CuaO6.gFy liang Anren, Zhou Qinwei and Peng Ying, Fudan University, P. R. China

It's a significant job to increase the zero resistance temperature of high-Tc superconductor. To in- crease Tc we try to increase the amount of Cu 3+ by adding fluorine to the oxygen vacancies of the Ba2Y1Cu306.9 structure. The new high-Tc super- conductor Ba2YICu306.9Fy was obtained by letting the sample of Ba2YICu306.9 absorb F2 gas at 150°C ~or 30 rains. The Tc of Ba2YiCu306.9Fyis 92 K (about 3 K higher than that of Ba2YICu306.9) and the amount of F(expressed as y) is 0.5-1.0 measured by chemical analysis. Ac:ording to the results of TG, TPD experiments, the Ba2YICu306.9 samples before and after fluoridation release the same amount of oxygen. It can be proved that the reac- tion of F2 with Ba2YICu306.9 is an addition reac- tion. XRD diagrams showed the structure of Ba2YICu306.9F,, is similar to that of Ba2YICu306.9.

Pillared Clays and Micas Iack W. iohnson and John F. Research and Engineering, USA.

Brody, Exxon

Materials wi~h zeolite-like pores in the 10 A range can be synthesized by intercalating large polyoxo-

cations between the layers of smectite clays. Subsequent calcination dehydrates the cations and converts them into oxide pillars that prop the clay layers apart, resulting in permanent microporosity in the interlayer- region. Pillared clays have been studied extensively during the last decade due to their potential use in petroleum processing as cracking and hydrocracking catalysts. Previous workers have primarily utilized smectite clays such as montmorillonite and hectorite as the starting layered material for pillared clay. We have found that synthetic fluoromicas, clay-like materials of layer charge density higher than that of smectites, can also be pillared with polyoxoaluminum cations of a luminum and zirconium to form pillared fluoromicas that are stable up to 700°C in the presence of steam. The synthesis of these new materials and the characterization of their pore structure and addity will be discussed.

Vibrational Spectra of Molte~l and Glassy GeS% Rajiv K. Kali@, P. Vashishta, Argonne National Lab., USA, and I. Ebbsj6, Studsvik Neutron Research Lab., Sweden

Vibrational density of states of molten and vitre- ous GeSe 2 is calculated from the fourier transform of the velocity autc,-correlation functions, and the equation of motion method. Effective interionic potentials are used in the molecular dynamics study. The calculated phonon density of states in the glass shows peaks at 8.0, 10.8, 26.4, 34.4, and 37.2 rneV, which are in good agreement with inelastic neutron scattering experiments. In addition, the companion line (AIc) of the symmetric breathing mode A~ (26.4 meV) is identified with a feature at 27.8 meV. Weaker features are found at 12.6, 17.2, and 22.0 meV, in agreement with neutron and Raman sca~qering experiments.

Oxidative Inte.rcalation of Conducting Polymers in Layered Inorganic Matrices M. G. Kanatzidis*, H. O. Marcy, M. Hubbard, C. R. Kannewurf, and T. J. Marks, Northwestern University (*Michigar~ State University), USA.

The redox intercalation reactions of several thio- phenes, pyrroles and their derivatives with FeOCI are presented. The new compounds obtained are among the most electrically conductive FeOCl compounds known. On the basis of analytical, spectroscopic, X-ray diffractometric, charge trans-