EUROMET PROJECT nº 732 “Towards more accurate fixed

points”:

Progress of CEM Works in the Triple Point of Mercury

The mercury: supplied by the Almaden mine (Spain).

The materialThe material: Borosilicate glass.

460 mm

232 mm

10 mm6 mm

6 mm

50 mm

6 mm

Cells assembly

Cells assembly

The cleaning: 1 day NO3H + rinsed with distilled water + 3 days steam cleaning + drying: heated in vacuum

The set upThe set up:: a distillation + vacuum system .

Cells filling

A1P1A1P1 Hg directly Hg directly poured from the poured from the bottlebottle

A1P2D2A1P2D2

A1P4D1A1P4D1

1 distillation1 distillation

2 distillation2 distillation

A1P4D2A1P4D2 2 distillation2 distillation

Distillation process

6 kg 2 ampoules2 ampoules 1 big cell1 big cell 2 ampoules2 ampoules

1 reservoir1 reservoir2 ampoules2 ampoules1 reservoir1 reservoir

2,5 kg

1 ampoule1 ampoule 1 big cell1 big cell 1 small cell1 small cell

1 reservoir1 reservoir

(Big) Cells filled

A1P1A1P1 Hg (from the bottle): Purity: 99,999 939 0 % Isotopic composition: in process

A1P2D2A1P2D2

A1P4D1A1P4D1

Hg (1 distillation): Purity: 99,999 999 5 % Isotopic composition: in process

Hg (2 distillation): Purity: in process Isotopic composition: in process

Chemical Analysis

Element ResultDetection

Limit Weight x i ResultDetection

Limit Weight xii ng/g <ng/g % ng/g <ng/g %

Ag 565 3 5,65E-05 1,05066E-06 1 1 1,00E-07 1,85958E-09Al 2 8 2,00E-07 1,48687E-08 0,06 2 6,00E-09 4,46061E-10As 0,08 3 8,00E-09 2,14186E-10 1 1 1,00E-07 2,67733E-09Ba 0,3 0,2 3,00E-08 4,38202E-10 0,2 0,2 2,00E-08 2,92135E-10Be 0,3 0,3 3,00E-08 6,67729E-09 0,1 0,1 1,00E-08 2,22577E-09Cd 1,9 0,3 1,90E-07 3,39042E-09 0,04 0,04 4,00E-09 7,13774E-11Co 0,2 2 2,00E-08 6,80736E-10 0,4 0,4 4,00E-08 1,36147E-09Cr 0,3 2 3,00E-08 1,15734E-09 0,4 0,4 4,00E-08 1,54312E-09Cu 3 3 3,00E-07 9,46983E-09 0,08 1 8,00E-09 2,52529E-10Fe 29 8 2,90E-06 1,04165E-07 0,4 0,4 4,00E-08 1,43676E-09Mn 0,2 2 2,00E-08 7,30336E-10 0,4 0,4 4,00E-08 1,46067E-09Ni 0,1 3 1,00E-08 3,41759E-10 0,08 1 8,00E-09 2,73407E-10Pb 1,2 2 1,20E-07 1,16172E-09 0,4 0,4 4,00E-08 3,87239E-10Sb 3 3 3,00E-07 4,94226E-09 0,08 1 8,00E-09 1,31794E-10V 2 2 2,00E-07 7,8753E-09 0,04 0,4 4,00E-09 1,57506E-10Zn 0,8 4 8,00E-08 2,45407E-09 0,08 0,4 8,00E-09 2,45408E-10

Hg 99, 999 939 1 99, 999 999 5

x = 1,20923E-06 x = 1,8533E-08T OME= x/A = 0,241 mK T OME= x/A = 0,004 mK

FIRST FLASK SECOND FLASK

Cells characterization

A1P1

-1

0

1

0,0 0,2 0,4 0,6 0,8 1,0

F

T/m

K

Melting after fast freezing (22 h)Melting after slow freezing(24 h)

A1P2D2

-1

0

1

0 0,2 0,4 0,6 0,8 1

F

T/m

K

Melting after fast freezing (22 h)Melting after slow freezing (24 h)

A1P4D1

-1

0

1

0 0,2 0,4 0,6 0,8 1

F

T/m

K

Melting after fast freezing (20 h)Melting after slow freezing (20 h)

Cells comparisonAlcohol bath.2 cells at the same time.Differences estimated by W (0 mA)Differences measured with respect

to the cell A1P2D2.

Differences measured

-0,4

0,0

0,4

A1P1 A1P2D2 A1P4D1

mK

Future works

Calorimeter for small cells.Study of the impurities influence

doping small cells.

Thanks for your attention