Relaxation, Electronic and Volume Expansion Contributions to the Elastic Constant Changes Induced by Hydrogen and Deuterium in Nb
The high frequency moduli and acoustic attenuation have been measured in Nb-H(D) alloys over a wide range of H/Nb and temperatures. An anelastic relaxation has been investigated, whose strength depends on T according to a Curie-Weiss type of relationship. This relaxation effect only partly accounts for the softening of the elastic constants C’ and C induced by hydrogen or deuterium. The moduli are also affected by a positive electronic contribution and a negative contribution due to the volume expansion.
KeywordsElastic Constant Isotope Effect Relaxation Effect Ultrasonic Attenuation Relative Volume Change
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