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 synthe...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.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2011CB808200the National Natural Science Foundation of China under Grant No 11027405+1 种基金the National Natural Science Foundation of China under Grant Nos 10976018 and 11179030the Foundation of LSD under Grant No 9140C670203110C6705.
文摘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.
