WANG Genmiao ZHANG Han ZHANG Qirui WU Yonghua University of Science and Technology of China
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Hefei
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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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