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Solid solutions in the Ba2Y1−xCuxWO6−y system

Published online by Cambridge University Press:  29 June 2016

A. García-Ruiz ,
Bokhimi  and
M. Portilla
A. García-Ruiz
Affiliation:
Instituto de Física, Universidad Nacional Autónoma de México, a.p. 20-364, 01000 México D. F., Mexico
Bokhimi
Affiliation:
Instituto de Física, Universidad Nacional Autónoma de México, a.p. 20-364, 01000 México D. F., Mexico
M. Portilla
Affiliation:
Facultad de Química, Universidad Nacional Autónoma de México, a.p. 70-197, 01000 México D.F., Mexico
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Abstract

The crystalline structure of the Ba2Y1−xCuxWO6−y system was obtained from x-ray diffraction measurements as a function of copper concentration. Five different x regions are observed, four of which correspond to solid solutions and lie at x ≤ 0.75. The crystalline structure of the phases at these copper concentrations has cubic symmetry with lattice parameters between 0.8382 and 0.8275 nm. At 0.75 < x ≤ 1.0 the samples are a mixture of two phases. In this study we have identified the existence of only two stoichiometric compounds: Ba8Y3CuW4O24 with a cubic crystalline structure with space group Pm3m and lattice parameter of 0.8350(1) nm, and Ba2CuWO6 with a crystalline tetragonal structure and space group I4/mmm and lattice parameters a = 0.5566(1) nm and c = 0.8634(1) nm. The crystalline structure at all copper concentrations is based in the ordered perovskite structure. The samples show electrical insulator behavior.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 1 , January 1992 , pp. 24 - 28
Copyright
Copyright © Materials Research Society 1992

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References

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