ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
A series of oxides of the composition Sr2LnTaCu2O8, 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−δ-type structure. (Powder Diffraction File Nos. 46–1490 for Sr/NdTaCu2O8, 46-1489 for Sr2SmTaCu2O8, 46-1488 for Sr2EuTaCu2O8 and 46-1487 for Sr2CdTaCu2O8.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S002188989500879X
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