Abstract
In situ x-ray diffraction on Pd hydride under 5 GPa of hydrogen pressure show that lattice contraction due to vacancy formation occurs in 2-3 h at 700-800 °C, and two-phase separation into PdH and a vacancy-ordered phase of Au structure () on subsequent cooling. After recovery to ambient conditions and removal of hydrogen, the vacancy concentration in Pd metal was determined by measuring density and lattice parameter changes to be 18 ± 3 at.%. This procedure provides a new method of introducing superabundant vacancies in metals.
- Received 6 April 1994
DOI:https://doi.org/10.1103/PhysRevLett.73.1640
©1994 American Physical Society