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Ultrasonic relaxation rates in palladium hydride and palladium deuteride

Physical Review B, ISSN: 0163-1829, Vol: 33, Issue: 12, Page: 8325-8328
1986
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Ultrasonic attenuation measurements were performed on single-crystal samples of PdH0.67 and PdD0.67 over the temperature range of 77 300 K. The measured relaxation rates for hydrogen (deuterium) motion exhibit an inverse isotope effect, in agreement with long-range diffusion experiments. While the measured activation energies for hydrogen and deuterium are in good agreement with previous experiments, the attempt frequencies are not. The present attempt frequencies are in good agreement with those expected from the optic-mode frequencies; the previous values were anomalously low. © 1986 The American Physical Society.

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