THE CRYSTAL-STRUCTURE OF (PB0.5CD0.5)SR2(Y1-XCAX)CU2O7

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	THE CRYSTAL-STRUCTURE OF (PB0.5CD0.5)SR2(Y1-XCAX)CU2O7
	J. R. Min; J. K. Liang; X. L. Chen; C. Wang; C. Dong; G. H. Rao
	1994
发表期刊	Physica C-Superconductivity and Its Applications
ISSN	0921-4534
卷号	230 期号:3-4 页码:389-396
摘要	The crystal structures of (Pb0.5Cd0.5)Sr2YCu2O7, (Pb0.5Cd0.5)Sr2(Y0.6Ca0.4)Cu2O7 and (Pb0.5Cd0.5)Sr2(Y0.5Ca0.5)Cu2O7 have been refined by the Rietveld method for the X-ray diffraction data. The refinement results indicate that both Pb and Cd atoms in the (Pb, Cd)O layers and O(3) atoms are displaced from their ideal sites, and that there is a complicated occupation in the (Pb, Cd)O layers, i.e., other cations, such as Sr2+, Cu2+ and Ca2+, can occupy the (Pb, Cd) site for these samples. This may be the reason why the lattice constants do not vary monotonically with the calcium content, and why there exist broad superconducting transitions in the system (Pb0.5Cd0.5)Sr2(Y1-xCax)Cu2O7. The refinement results also indicate that, as the calcium content increases, the O(2) atoms move close to the CuO2 planes and far from the (Pb, Cd)O layers. Thus, the increase of calcium content results in charge transfer from the charge reservoir layer (Pb, Cd)O to the CuO2 planes. This result is consistent with the bond valence sums of the Cu ions in the CuO2 planes.
部门归属	acad sinica,int ctr mat phys,shenyang 110015,peoples r china. chinese acad sci,natl lab superconduct,inst phys,beijing 100080,peoples r china.;min, jr (reprint author), chinese acad sci,inst phys,beijing 100080,peoples r china
关键词	Cu-o Superconductivity System Family Oxygen Optimization Temperature Transition Oxides Member
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38898
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. R. Min,J. K. Liang,X. L. Chen,et al. THE CRYSTAL-STRUCTURE OF (PB0.5CD0.5)SR2(Y1-XCAX)CU2O7[J]. Physica C-Superconductivity and Its Applications,1994,230(3-4):389-396.
APA	J. R. Min,J. K. Liang,X. L. Chen,C. Wang,C. Dong,&G. H. Rao.(1994).THE CRYSTAL-STRUCTURE OF (PB0.5CD0.5)SR2(Y1-XCAX)CU2O7.Physica C-Superconductivity and Its Applications,230(3-4),389-396.
MLA	J. R. Min,et al."THE CRYSTAL-STRUCTURE OF (PB0.5CD0.5)SR2(Y1-XCAX)CU2O7".Physica C-Superconductivity and Its Applications 230.3-4(1994):389-396.