| Bi2（Sr,Ca）3Cu2Oy超导体的EXAFS研究 |
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| 引用本文： | 赵贵文,孙红茂.Bi2（Sr,Ca）3Cu2Oy超导体的EXAFS研究[J].中国科学技术大学学报,1994,24(1):33-37. |
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| 作者姓名： | 赵贵文 孙红茂 |
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| 基金项目： | 国家自然科学基金,博士点基金 |
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| 摘 要： | 利用扩展Ｘ射线吸收精细结构（ＥＸＡＦＳ），研究了Ｂｉ２（Ｓｒ，Ｃａ）２Ｃｕ２Ｏｙ超导体中Ｃｕ原子与Ｂｉ原子的局域结构．结果表明：Ｃｕ原子第一配位层是五配位的氧原子，第二配位层是四配位的Ｃａ原子和一配位的Ｃｕ原子，但不含Ｓｒ原子的结构信息，这是Ｓｒ－Ｏ层与Ｃｕ－Ｏ层层间距较大所致；同时测定Ｂｉ原子第一配住层含有２．３个氧原子，用非公度调制结构模型解释了Ｂｉ原子的配位状况．
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| 关 键 词： | Bi_2（Sr，Ca）_2Cu_2Oy，超导体，EXAFS，键价理论 |
EXAFS Study on Bi_2 (Sr, Ca)_3Cu_2O_y Superconductor |
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| Zhao Guiwen,Sun Hongmao.EXAFS Study on Bi_2 (Sr, Ca)_3Cu_2O_y Superconductor[J].Journal of University of Science and Technology of China,1994,24(1):33-37. |
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| Authors: | Zhao Guiwen Sun Hongmao |
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| Institution: | Department of Applied Chemistry |
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| Abstract: | EXAFS has been applied to study the local structure of Cu and Bi atoms in Bi2 (Sr,Ca)3Cu2Oy superconductor with Tc=72. 8K. The results have shown that Cu is five O atoms coordinated at the firSt shell, and four Ca atoms and one Cu atom surrounded at the second Shell, but no information of Sr atom included in this shell ; It is supposed that the phenomina be attributed to the iong distance between Cu-O and Sr-O layers; At the first Shell of Bi atom, the average coordinate number is 2. 3 for O atoms, which is accordance with BVS model and M. B. Wailer's incommensurate modulated structure. |
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| Keywords: | Bi_2 (Sr Ca)_3Cu_2Oy superconductor EXAFS bond-valence-sum |
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