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  5. Chemical bond properties and Mossbauer spectroscopy in (La1-xMx)2CuO4 (M=Ba, Sr)

Chemical bond properties and Mossbauer spectroscopy in (La1-xMx)2CuO4 (M=Ba, Sr)

来源 :稀有金属 | 被引量 : 0次 | 上传用户：JIADOS
【摘 要】
：
By using the average band-gap model, the chemical bond properties of (La1-x Mx)2CuO4(M=Ba, Sr) were calculated . The calculated covalencies for Cu(O and La(O bo
【作 者】
：
GAO Faming LI Dongchun XIE Dia 
【机 构】
：
College of Materials Science and Chemical Engineering,Laboratory of Rare Earth Chemistry and Physics
【出 处】
：
稀有金属
【发表日期】
：
2004年期
【关键词】
：
superconductor rare earth oxide chemical bond M?ssbauer effect 
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By using the average band-gap model, the chemical bond properties of (La1-x Mx)2CuO4(M=Ba, Sr) were calculated . The calculated covalencies for Cu(O and La(O bond in the compounds are 0.3 and 0.03 respectively. M?ssbauer isomer shifts of 57Fe doped in La2CuO4 and 119Sn doped in La2CuO4 were calculated by using the chemical surrounding factor defined by covalency and electronic polarizability. Four valence state tin and three valence iron sites were identified in 57Fe and 119Sn doped La2CuO4.
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