Effect of Pressure on Vacancy Concentrations in Platinum

The excess electrical resistivity quenched into platinum as a function of pressure (up to 6 kbar) and of quench rate has been measured. The activation volume for the formation of vacancies was found to be 6.4 ± 0.7 ${\mathrm{cm}}^3$/mole (0.70 atomic volume). Preliminary results on fractional vacancy loss during quench as a function of quench rate are consistent with previous conclusions that vacancy clustering is negligible in platinum.