WANG Genmiao ZHANG Han ZHANG Qirui WU Yonghua University of Science and Technology of China
,
Hefei
,
China
金属学报(英文版)
Mssbauer spectra measurements reveal that Sn exists in YBa_2Cu_(3_x)Sn_xO_(7_y) system (x=0.05,0.10,0.20,0.30 and 0.40)in form of Sn~(4+) and occupies Cu(1)and Cu(2)sites.The relative rate at which Sn~(4+) occupies Cu(1)or Cu(2)sites varies with x.The superconductivity transition temperature,T_c,depresses slightly due to the substitution of Cu for Sn.
关键词:
Y-Ba-Cu-O system
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null
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null
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null
王根苗
,
张酣
,
张其瑞
,
吴泳华
金属学报
通过透射Mossbauer谱的测量,确定了高温超导体YBa_? Cu_(3-x)Sn_xO_(7-y)体系中(x=0.05,0.10,0.20,0.30,0.40),掺入的Sn以Sn~(4+)离子的形式存在,并在体系中分别占据着Cu(Ⅰ)和Cu(Ⅱ)两种位置,二者位置的相对比例随Sn的掺入量(x)而变化,超导转变温度(T_c)的测量表明,少量Sn的掺入使T_c略有降低。
关键词:
Y-Ba-Cu-O体系
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Mossbauer spectrum
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superconductivity transition temperature
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substitution
