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Structural Disorder and Thermal Dilatation Behavior in Cr-Doped Mullite

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 a sol-gel route and sintered at 1650° C have been determined from X-Ray Diffraction data as a function of both temperature and Cr contents. Profile refinements on the X-ray diffraction diagrams have been carried out, showing that, at temperatures between 800° and 1535° C, an anisotropic thermal expansion takes place for the a and b lattice parameters of the Cr-doped mullite. We show that this anisotropic expansion is dependent on the temperature increase and the chromium content for the different compositions of the mullite crystals.

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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