Structural and electrical properties of PbMoO₄ under high pressure

High pressure Raman spectra and in situ electrical conductivity measurement of scheelite-structure PbMoO 4 have been conducted using a diamond anvil cell (DAC). The Raman spectra of powdered PbMoO 4 were determined up to 26.5 GPa under nonhydrostatic conditions. The results indicate that PbMoO 4 undergoes a transition from crystal to amorphous phase with increasing pressure, and the phase-transition pressure was about 12.5 GPa. The electrical conductivity of PbMoO 4 as a function of pressure and temperature was studied using a designed DAC. The experimental results show that the electrical conductivity of PbMoO 4 increases with increasing pressure and temperature. Compared with the electrical conductivity value of PbMoO 4 at 7.4 GPa and 430 K, it increases by about two orders of magnitude at 26.5 GPa and 430 K.