摘要
利用集成在金刚石对顶砧上的测量微电路研究了CdSe粉末在高压条件下的交流阻抗谱,在低于2.8GPa时显示出两个交叠的半圆弧,在高于2.8GPa时显示出一个不完整的半圆弧和一个压缩的半圆弧,这表明在高压条件下CdSe粉末中始终存着两个电传导过程,分别对应于晶体内传导过程和晶界传导过程.运用等效电路法我们获得了CdSe晶体体电阻随压力的变化关系,分别在2.8GPa,10.0GPa和17.0GPa附近观察到了体电阻的异常变化,这些异常变化源于CdSe在高压条件下的结构相变和电子相变.
By using the microcircuit integrated on diamond anvil, we measured the alternating current impedance spectroscopy of CdSe powder under high pressure. The impedance spectroscopy shows two overlapped semicircle arcs below 2.8 GPa, while at pressure above 2.8 GPa, one incomplete semicircle arc and one suppressed semicircle are were observed. This indicated that under high pressure there were two conduction processes in CdSe powder all the time, that is to say, grain interior and grain boundary conduction processes. By using the equivalent circuit method, the pressure dependence of grain bulk resistance was obtained. Three abnormal changes of resistance were observed, occurring at 2.8 GPa, 10.0 GPa and 17.0 GPa, which are attributed to the structural and electronic phase transitions of CdSe.
出处
《河南师范大学学报（自然科学版）》
CAS
北大核心
2014年第3期43-47,共5页
Journal of Henan Normal University(Natural Science Edition)
基金
国家自然科学基金(11204067
11304081
11204068)
河南省教育厅自然科学基金(12B140008
12B140009)
河南理工大学博士基金(648443
648428)
河南理工大学青年基金(Q2012-48)
关键词
金刚石对顶砧
交流阻抗谱
硒化镉
相变
diamond anvil cell
alternating current impedance spectroscopy
CdSe
phase transition
