TITLE

Synthesis of metal hydrides and in situ resistance measurements in a high-pressure diamond anvil cell

AUTHOR(S)
Hemmes, H.; Driessen, A.; Kos, J.; Mul, F. A.; Griessen, R.; Caro, J.; Radelaar, S.
PUB. DATE
March 1989
SOURCE
Review of Scientific Instruments;Mar89, Vol. 60 Issue 3, p474
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have constructed a diamond anvil cell and a cryogenic system for high-pressure experiments at temperatures down to 1.5 K. A new mechanism is used to apply the force, and the body of the cell contains a heat-exchanger for use with liquid helium or liquid nitrogen. With the press, a maximum force of 30 000 N can be applied to the diamonds. The force can be changed at any temperature from outside the cryostat. We describe a technique to load metal samples with hydrogen at high pressures and do in situ resistance measurements. With this technique, we have synthesized stoichiometric PdH and PdD at a pressure of ∼4 GPa. We also have measured the pressure dependence of their superconducting transition temperatures. For PdH we find Tc=8.8 K and ∂ ln Tc/∂P=-6.8×10-2 GPa-1, and for PdD we find Tc=11.05 K and ∂ ln Tc/∂P=-5.0×10-2 GPa-1.
ACCESSION #
9785037

 

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