IN-SITU HVEM STUDY ON PHASE TRANSITION OF YBa2Cu3O7-x SUPERCONDUCTING COMPOUND IN PROCESS OF HEATING
来源期刊：Journal of Rare Earths1990年第2期
论文作者：王瑞坤 邸秀萱 王振海 贺庆 俞定安 周和平 王英
文章页码：99 - 103
摘 要：<正> In-situ HVEM observation on phase transition of the YBa2Cu3O7-x superconducting compound in pro-cess of heating was carried out,and high temperature X-ray diffraction analysis in air and X-ray diffractionphase analysis for the sample treated in vacuum condition were made.The results showed that the temperatureof phase transition is related to oxygen content in the sample and in general,is 100℃ to 120℃ lower in vacu-um condition than in air.At 320℃ to 350℃ twin bands begin to disappear,and some Cu2O are formed on thesurface of the sample and transit from orthorhombic YBa2Cu3O7-x to arthorhombic Y2BaCuO5 compound.This transition was completed at about 500℃.Above 900℃,this compound consists of the Y2BaCuO5,BaCuO2,Y2O3 and some other minor compounds.No phase transition was observed during cooling thesample.
王瑞坤，邸秀萱，王振海，贺庆，俞定安，周和平，王英
摘 要：<正> In-situ HVEM observation on phase transition of the YBa2Cu3O7-x superconducting compound in pro-cess of heating was carried out,and high temperature X-ray diffraction analysis in air and X-ray diffractionphase analysis for the sample treated in vacuum condition were made.The results showed that the temperatureof phase transition is related to oxygen content in the sample and in general,is 100℃ to 120℃ lower in vacu-um condition than in air.At 320℃ to 350℃ twin bands begin to disappear,and some Cu2O are formed on thesurface of the sample and transit from orthorhombic YBa2Cu3O7-x to arthorhombic Y2BaCuO5 compound.This transition was completed at about 500℃.Above 900℃,this compound consists of the Y2BaCuO5,BaCuO2,Y2O3 and some other minor compounds.No phase transition was observed during cooling thesample.
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