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Structural Disorder and Thermal Dilatation Behavior in Cr-DopedMullite

Published online by Cambridge University Press:  21 February 2011

M.P. Villar ,
J.M. Geraldia  and
L. Gago-Duport
M.P. Villar
Affiliation:
Dept. de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Universidad de Cádiz, Apartado 40, Puerto Real (Cádiz), Spain
J.M. Geraldia
Affiliation:
Dept. de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Universidad de Cádiz, Apartado 40, Puerto Real (Cádiz), Spain
L. Gago-Duport
Affiliation:
Dept. de Estructura y Propiedades de los Materiales, Universidad de Cádiz, Apartado 40, Puerto Real (Cádiz), Spain
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Abstract

Lattice parameters of some different chromium-doped mullites obtained by asol-gel route and sintered at 1650° C have been determined from X-RayDiffraction data as a function of both temperature and Cr contents. Profilerefinements on the X-ray diffraction diagrams have been carried out, showingthat, at temperatures between 800° and 1535° C, an anisotropic thermalexpansion takes place for the a and blattice parameters of the Cr-doped mullite. We show that this anisotropicexpansion is dependent on the temperature increase and the chromium contentfor the different compositions of the mullite crystals.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 757
Copyright
Copyright © Materials Research Society 1998

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References

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