| 高温超导体(La1-xMx)2CuO4(M=Ba，Sr)的化学键性质和M(o^)ssbauer谱研究 |
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| 引用本文： | 谢丹阳,黄梅丽,高发明.高温超导体(La1-xMx)2CuO4(M=Ba，Sr)的化学键性质和M(o^)ssbauer谱研究[J].燕山大学学报,2003,27(2). |
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| 作者姓名： | 谢丹阳 黄梅丽 高发明 |
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| 作者单位： | 燕山大学环境与化学工程系,秦皇岛 066004 |
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| 摘 要： | 利用复杂晶体化学键电介质的平均能带模型研究了(La_(1-x)M_x)_2CuO_4(M=Ba,Sr)的化学键特性,得到Cu-O键的平均共价性为0.3,La-O键的平均共价性为0.03。应用由共价性和极化率定义的化学环境因子计算了~(57)Fe在La_2CuO_4中的Mossbauer同质异能位移,确定了~(57)Fe在La_2CuO_4中的价态和占位情况。
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| 关 键 词： | 超导体 稀土氧化物 化学键 Mossbauer效应 |
Chemical Bond Properities of (La1-xMx)2CuO4(M=Ba,Sr)and its Mossbauer Spectroscopy |
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| ,.Chemical Bond Properities of (La1-xMx)2CuO4(M=Ba,Sr)and its Mossbauer Spectroscopy[J].Journal of Yanshan University,2003,27(2). |
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| Authors: | , |
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| Institution: | (Xie Danyang),(Huang Meili),(Gao Faming)(The Department
of Environment and Chemical Engineering,Yanshan University. Qinhuangdao 066004) |
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| Abstract: | By using the average band-gap model, the chemical bond properties of (La1-xMx) 2CuO4 (M=Ba, Sr) werecal-culated . The calculated covalencies for Cu-O and La-O bond in the compounds are 0.3 and 0.03 respectively. Mo ssbauer isomer shifts of57Fe doped in La2CuO4was calculated by using the chemical surrounding factor, h, defined by co-valency and electronic polarizability . Four valence state tin and three valence iron sites was identified in "Fe doped La2CuO4 superconductor. |
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| Keywords: | superconductor rare earth oxide chemical bond Mossbauer effect |
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