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High-temperature X-ray powder diffraction study of the tetragonal-cubic phase transition in nanocrystalline, compositionally homogeneous ZrO2–CeO2 solid solutions

Published online by Cambridge University Press:  06 March 2012

L. M. Acuña,
R. O. Fuentes,
D. G. Lamas,
I. O. Fábregas,
N. E. Walsöe de Reca and
A. F. Craievich
L. M. Acuña
Affiliation:
Centro de Investigaciones en Sólidos (CINSO), Instituto de Investigaciones Científicas y Técnicas de las Fuerzas Armadas-Consejo Nacional de Investigaciones Científicas y Técnicas (CITEFA-CONICET), J.B. de La Salle 4397, 1603 Villa Martelli, Pcia. de Buenos Aires, Argentina
R. O. Fuentes
Affiliation:
Centro de Investigaciones en Sólidos (CINSO), Instituto de Investigaciones Científicas y Técnicas de las Fuerzas Armadas-Consejo Nacional de Investigaciones Científicas y Técnicas (CITEFA-CONICET), J.B. de La Salle 4397, 1603 Villa Martelli, Pcia. de Buenos Aires, Argentina
D. G. Lamas
Affiliation:
Centro de Investigaciones en Sólidos (CINSO), Instituto de Investigaciones Científicas y Técnicas de las Fuerzas Armadas-Consejo Nacional de Investigaciones Científicas y Técnicas (CITEFA-CONICET), J.B. de La Salle 4397, 1603 Villa Martelli, Pcia. de Buenos Aires, Argentina
I. O. Fábregas
Affiliation:
Centro de Investigaciones en Sólidos (CINSO), Instituto de Investigaciones Científicas y Técnicas de las Fuerzas Armadas-Consejo Nacional de Investigaciones Científicas y Técnicas (CITEFA-CONICET), J.B. de La Salle 4397, 1603 Villa Martelli, Pcia. de Buenos Aires, Argentina
N. E. Walsöe de Reca
Affiliation:
Centro de Investigaciones en Sólidos (CINSO), Instituto de Investigaciones Científicas y Técnicas de las Fuerzas Armadas-Consejo Nacional de Investigaciones Científicas y Técnicas (CITEFA-CONICET), J.B. de La Salle 4397, 1603 Villa Martelli, Pcia. de Buenos Aires, Argentina
A. F. Craievich
Affiliation:
Instituto de Física, Universidade de São Paulo, Rua do Matão Travessa R 187, 05508-900 São Paulo, São Paulo, Brazil
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Abstract

Crystal structure of compositionally homogeneous, nanocrystalline ZrO2–CeO2 solutions was investigated by X-ray powder diffraction as a function of temperature for compositions between 50 and 65 mol % CeO2. ZrO2-50 and 60 mol % CeO2 solid solutions, which exhibit the t′-form of the tetragonal phase at room temperature, transform into the cubic phase in two steps: t′-to-t″ followed by t″-to-cubic. But the ZrO2-65 mol % CeO2, which exhibits the t″-form, transforms directly to the cubic phase. The results suggest that t′-to-t″ transition is of first order, but t″-to-cubic seems to be of second order.

Keywords

nanocrystalline powderszirconia-ceriahigh-temperature X-ray powder diffractionsynchrotron radiation

Information

Type
Technical Articles
Information
Powder Diffraction , Volume 23 , Special Issue S1 , March 2008, pp. S70 - S74
Copyright
Copyright © Cambridge University Press 2008

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