An X-ray powder diffraction study of Sr(2)LnTaCu(2)O(8), Ln=Nd,Sm,Eu,Gd

被引：3
|
作者：
Grzeta, B [1 ]
Toraya, H [1 ]
Brnicevic, N [1 ]
Basic, I [1 ]
Planinic, P [1 ]
机构：
[1] NAGOYA INST TECHNOL,CERAM RES LAB,TAJIMI,GIFU 507,JAPAN
来源：
JOURNAL OF APPLIED CRYSTALLOGRAPHY | 1996年 / 29卷 / pt 1期
关键词：
D O I：
10.1107/S002188989500879X
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A series of oxides of the composition Sr(2)LnTaCu(2)O(8), Ln=Nd Sm, Eu, Gd has been prepared and characterized by X-ray powder diffraction. Samples are tetragonal, space group P4/mmm and isostructural with a perovskite-like phase Ba2LaTaCu2O8. The unit-cell parameters have been determined using Mo or Si as internal standard. The structure of Sr2SmTaCu2O8 has been refined by the Rietveld method. X-ray diffraction patterns of the samples and the crystal structure of Sr2SmTaCu2O8 showed ordering of Ta and Cu ions: the octahedrally coordinated Ta ion is on the Cu(1) site, while Cu ions remain on the Cu(2) sites of the Ba2YCu3O7-delta-type structure. (Powder Diffraction File Nos. 46-1490 for Sr2NdTaCu2O8, 46-1489 for Sr2SmTaCu2O8, 46-1488 for Sr2EuTaCu2O8 and 46-1487 for Sr2CdTaCu2O8.
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页码：37 / 41
页数：5
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