Phase composition and crystal structure of (La2-yNdy)(1-x/2)Sr1+xCu2O6 (0 <= x <= 1; 0 <= y <= 2)
文献类型：期刊论文
| 作者 | Deng, H ; Dong, C ; Shen, JC ; Chen, H ; Wu, F ; Zhou, YR |
| 刊名 | JOURNAL OF ALLOYS AND COMPOUNDS
 |
| 出版日期 | 1999 |
| 卷号 | 289期号:1-2页码:48 |
| 关键词 | DEFECT PEROVSKITE LAYERS TRANSPORT-PROPERTIES COPPER-OXIDES SRO LAYERS OXYGEN SYSTEM SUPERCONDUCTIVITY INTERGROWTHS CUPRATE EXCESS |
| ISSN号 | 0925-8388 |
| 通讯作者 | Deng, H (reprint author), Chinese Acad Sci, Natl Lab Superconduct, Inst Phys, Beijing 100080, Peoples R China. |
| 中文摘要 | In this paper the phase composition and crystal structure of (La2-yNdy)(1-x/2)Sr1+xCu2O6 were investigated and discussed based on the synthesis and powder X-ray diffraction studies of three series of Nd2-xSr1+xCu2O6 (0 less than or equal to x less than or equal to 1), La2-xSr1+xCu2O6 (0 less than or equal to x less than or equal to 1) and (La2-yNdy)SrCu2O6 (0 less than or equal to y less than or equal to 2). The solid solubility of Nd2+xSr1+xCu2O6 and La2-xSr1+xCu2O6 was determined as 0.08 less than or equal to x less than or equal to 0.3 and 0 less than or equal to x less than or equal to 0.25, respectively. The phase relations in (La2-yNdy)(1-x/2)Sr1+xCu2O6 were also given according to the above results. The existence of three sub-lattices as La2.1.3Nd0-0.7Sr1-1.25Cu2O6, La1.2-0.5Nd0.8-1.5Sr1-1.25Cu2O6 and Nd1.6-1.92La0.4 0Sr1+delta-1.2Cu2O6 (0 < delta less than or equal to 0.08) was supposed and this consideration was demonstrated by the structural refinements for the three ended compositions of La2SrCu2O6, LaNdSrCu2O6 and Nd1.8Sr1.2Cu2O6 using powder X-ray diffraction data. It can be concluded that the lattice of (La, Nd)(2-x)Sr1+xCu2O6 is very sensitive to the ionic size of rare-earth elements. Different rare-earth elements (such as La3+, Nd3+ and La3++Nd3+) may cause rather different distributions of RE3+ and Sr2+ in the lattices and thus give a series of sub-lattices. On the other hand, stabilizing this type of the lattice is indeed the combined effect of ionic size and ionic charge valence. The different solid solubility and ionic occupations of La2-xSr1+xCu2O6 and Nd2-xSr1+xCu2O6 can be explained using the concept of the combined effect. The chemical complexity of RE2MCu2O6 (RE=Rare-earth, M=Alkaine-earth) may help understanding the different conducting abilities of these compounds. The structural refinements on NdSr2Cu2O6 and LaSr2Cu2O6 give another example for the chemical complexity of RE-M-Cu-O system. (C) 1999 Elsevier Science S.A. All rights reserved. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/50712]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Deng, H,Dong, C,Shen, JC,et al. Phase composition and crystal structure of (La2-yNdy)(1-x/2)Sr1+xCu2O6 (0 <= x <= 1; 0 <= y <= 2)[J]. JOURNAL OF ALLOYS AND COMPOUNDS,1999,289(1-2):48. |
| APA | Deng, H,Dong, C,Shen, JC,Chen, H,Wu, F,&Zhou, YR.(1999).Phase composition and crystal structure of (La2-yNdy)(1-x/2)Sr1+xCu2O6 (0 <= x <= 1; 0 <= y <= 2).JOURNAL OF ALLOYS AND COMPOUNDS,289(1-2),48. |
| MLA | Deng, H,et al."Phase composition and crystal structure of (La2-yNdy)(1-x/2)Sr1+xCu2O6 (0 <= x <= 1; 0 <= y <= 2)".JOURNAL OF ALLOYS AND COMPOUNDS 289.1-2(1999):48. |
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来源：物理研究所
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