The anelastic spectrum of two intermetallic polycrystalline ZrV2Hx samples (0 ? x ? 0.09) has been investigated from 1 to 600 K in the frequency range 250 kHz. Besides the well-known martensitic phase transformation around 120 K, two thermally activated peaks are detected in the H doped alloys around 230 and 410 K at a vibration frequency of about 3 kHz. The process at the lower temperature is due to the jumps of H atoms likely among tetrahedral interstitial sites in the cubic lattice of the Laves phase. The profile can be satisfactorily fitted with the superposition of two peaks, broader than single time Debye relaxations, with activation enthalpies of 0.33 and 0.41 eV. ... ...
Anelastic relaxation in ZrV2Hx intermetallic compounds
Cordero F;
2006
Abstract
The anelastic spectrum of two intermetallic polycrystalline ZrV2Hx samples (0 ? x ? 0.09) has been investigated from 1 to 600 K in the frequency range 250 kHz. Besides the well-known martensitic phase transformation around 120 K, two thermally activated peaks are detected in the H doped alloys around 230 and 410 K at a vibration frequency of about 3 kHz. The process at the lower temperature is due to the jumps of H atoms likely among tetrahedral interstitial sites in the cubic lattice of the Laves phase. The profile can be satisfactorily fitted with the superposition of two peaks, broader than single time Debye relaxations, with activation enthalpies of 0.33 and 0.41 eV. ... ...I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
