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Crystalline structure of Ba2YCu0.25W0.75O6: A member of the new set of Ba2YzCuxW1−xO6 solid solutions

Published online by Cambridge University Press:  10 January 2013

Bokhimi ,
A. Morales  and
A. Garci´a-Ruiz
Bokhimi
Affiliation:
Institute of Physics, National University of Mexico (UNAM), a.p. 20-364, 01000 México D. F., Mexico
A. Morales
Affiliation:
Institute of Physics, National University of Mexico (UNAM), a.p. 20-364, 01000 México D. F., Mexico
A. Garci´a-Ruiz
Affiliation:
UPIICSA, COFAA, National Polytechnic Institute (IPN), Té 950, Esq. Resina, 08400 México D. F., Mexico
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Abstract

A model for the crystalline structure of Ba2YCu0.25W0.75O6 solid solution is given. The model proposed a perovskite ordered structure, with a cubic unit cell made from eight perovskite-like units and having a symmetry described by the space group Fm3m. The crystalline structure was refined by the Rietveld technique, giving RF=0.048 for 82 reflections. The solid solution was characterized by the following parameters: Z=4, Mr=613.2, a=8.43630(8) Å, V=600.42(1) Å3, Dx=6.78 g cm−3, μ=209.04 mm−1, and F(000)=1047. The model assumed that copper and tungsten atoms, which were ordered with Y atoms, had the same local environment. Therefore, it was only a first approximation to the crystalline structure.

Type
Research Article
Information
Powder Diffraction , Volume 11 , Issue 1 , March 1996 , pp. 42 - 44
Copyright
Copyright © Cambridge University Press 1996

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