Abstract:
Phase transitions of Pb0.8Sn0.2Te crystal have been observed by X-ray powder diffraction technique with a diamond anvil cell (DAC) at pressures up to 25.2 GPa. At ambient pressure, Pb0.8Sn0.2Te crystal has fcc structure. Based on our experimental results, we observed that there exist two phase transitions in Pb0.8Sn0.2Te crystal. One appears at the pressure of 6.1 GPa, and the other at the pressure of 14.9 GPa. The former phase transition is concerned with metallization of Pb0.8Sn0.2Te crystal. Both phase transitions are reversible.