Vibrational density of states measurement of hydrogen trapped at dislocations in deformedPdH0.0008

Abstract

The vibrational density of states (DOS) of hydrogen trapped at dislocations in deformed ${\text{PdH}}_{0.0008}$ has been measured at 4 and 295 K with incoherent inelastic neutron scattering. The vibrational DOS at 4 K exhibits features characteristic of the low-temperature $\ensuremath{\beta}$-Pd hydride phase while the characteristic peak in the 295 K DOS corresponds to the solid-solution $\ensuremath{\alpha}$-Pd phase. This is evidence of a $\ensuremath{\alpha}\ensuremath{\rightarrow}\ensuremath{\beta}$ transition at low temperature within the distorted environment of dislocations.