MoO_3高压电输运性能研究  

Electrical Transportation Property of MoO_3 under High Pressure

作　　者：高春晓[1] 都丽佳 

机构地区：[1]吉林大学超硬材料国家重点实验室,吉林长春130012

出　　处：《吉林师范大学学报（自然科学版）》2015年第4期1-4,共4页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)(2011CB808204);国家自然科学基金项目(11374121)

摘　　要：利用DAC原位测量技术,研究了Mo O3电阻率和高压阻抗随压力的变化规律.电阻率在10.6 GPa和20.8 GPa时出现不连续变化,对应着Mo O3由正交相到单斜相(P21/m)再到单斜相(P21/c)的结构相变.压力低于10.6 GPa时,电阻率随着压力的增大而减少;单斜相(P21/m)的电阻率随压力增加而增加;压力高于20.8GPa时,电阻率随压力增加而减小.通过拟合复阻抗谱,得到了晶粒电阻随压力的变化规律.晶粒电阻在10.6GPa出现不连续变化,对应着Mo O3由正交相到单斜相(P21/m)的结构相变.正交相晶粒电阻随着压力的增大而减少.In this letter,in situ resistivity and impedance spectroscopy measurement of Mo O3 were conducted using diamond anvil cell. The electrical resistivity changed discontinuously at 10. 6 and 20. 8 GPa. These discontinuities correspond to the phase transitions of Mo O3 from orthorhombic to monoclinic（ P21 / m）,then to monoclinic（ P21 / c）. Before 10. 6 GPa,the resistivity decreased with pressure increasing; the resistivity of monoclinic（ P21 / m） phase increased with pressure increasing; after 20. 8 GPa,the resistivity decreased with pressure increasing. By fitting the plots of impedance spectroscopy,the grain resistance of Mo O3 under high pressure was obtained. The grain resistance changed discontinuously at 10. 6 GPa,corresponding to the phase transition of Mo O3 from orthorhombic to monoclinic（ P21 / m）. The grain resistance of orthorhombic phase decreased with pressure increasing.

关 键 词：阻抗谱 高压 电输运 

分 类 号：O521.3[理学—高压高温物理]