Electrical Characterization in the Phase Transition between Cubic PbCrO_(3) Perovskites at High Pressures  

作　　者：WANG Wen-Dan HE Duan-Wei XIAO Wan-Sheng WANG Shan-Min XU Ji-An 王文丹;贺端威;肖万生;王善民;徐济安(Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065;Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640;Institute of Fluid Physics and National Key Laboratory of Shockwave and Detonation Physics,China Academy of Engineering Physics,Mianyang 621900)

机构地区：[1]Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065 [2]Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640 [3]Institute of Fluid Physics and National Key Laboratory of Shockwave and Detonation Physics,China Academy of Engineering Physics,Mianyang 621900

出　　处：《Chinese Physics Letters》2013年第11期160-163,共4页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Program of China under Grant No 2011CB808200;the National Natural Science Foundation of China under Grant No 11027405;the National Natural Science Foundation of China under Grant Nos 10976018 and 11179030;the Foundation of LSD under Grant No 9140C670203110C6705.

摘　　要：By in situ x-ray diffraction,an isostructural phase transition between two kinds of the cubic PbCrO_(3) perovskites at around 1.6 GPa and room temperature with a 9.8%volume change is discovered.Recently,we have synthesized this cubic PbCrO_(3)perovskite successfully.Here we report our high-pressure in situ electrical resistance measurements up to 4.1 GPa for this perovskite sample.At room temperature,the resistance shows special changes at 1.2 and 2.7 GPa.They may indicate the starting and ending points of this transformation.At 4.1 GPa,the negative temperature resistance coefficient is observed,which means that phase Ⅱ could be considered as a semiconductor according to our present measurement.

关 键 词：RESISTANCE PEROVSKITE CUBIC 

分 类 号：TG1[金属学及工艺—金属学]