Abstract：In order to investigate the grain boundary effects on the electrical transport property and phase transition of powdered CdTe under high pressure,the impedance spectroscopy of CdTe was measured by using the diamond anvil cells. The results show that in the studied frequency range the electrical transport of CdTe occurs in both grain interiors and grain boundary under high pressure. The pressure dependence of grain resistance is obtained by using equivalent circuit method. Combined with the direct current measurement results,it is concluded that grain boundary has an obvious effect on the measured resistance but hardly affects the pressure where the phase transition occurs. The structure phase transition from rock-salt to Cmcm does not cause significant change of the electrical property,and the transportation method of carriers does not change obviously.

Keyword：alternating current impedance spectroscopy;phase transition under high pressure;electrical transport property;the grain boundary;