Thermal expansion and lattice anharmonicity of Pd-H and Pd-D alloys
- 1 March 1980
- journal article
- Published by IOP Publishing in Journal of Physics F: Metal Physics
- Vol. 10 (3) , 353-366
- https://doi.org/10.1088/0305-4608/10/3/006
Abstract
The authors have made thermal expansion measurements on Pd-H and Pd-D alloys. The measurements were performed between 9 and 270K, and with H(D) concentrations ranging from 0.69 to 0.82 H(D)/Pd atom ratios. Above 80K (in pure beta phase), the thermal expansion of Pd-H and Pd-D is increased compared with that of pure Pd, for comparable concentrations, D-doped samples have a larger expansion than those doped with H. For PdH0.7(PdD0.7), the authors find an essentially isotope-independent Gruneisen constant gamma H=3.0+or-0.7 for the optical phonons and a Gruneisen constant gamma ac=3.0+or-0.5 for the acoustic phonons.Keywords
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