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Crystal structure and local order of nanocrystalline zirconia-based solid solutions

Published online by Cambridge University Press:  06 March 2012

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
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
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
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
M. C. A. Fantini
Affiliation:
Instituto de Física, Universidade de São Paulo, Rua do Matão Travessa R 187, 05508-900 São Paulo, São Paulo, Brazil
R. J. Prado
Affiliation:
Departamento de Física, Instituto de Ciências Exatas e da Terra, Universidade Federal de Mato Grosso, Av. Fernando Corrêa s/n, Coxipó, 78060-900 Cuiabá, Mato Grosso, Brazil

Abstract

Crystal and local structures (long- and short-range order, respectively) of four nanocrystalline zirconia-based solid solutions—ZrO2-6 and 16 mol % CaO and ZrO2-2.8 and 12 mol % Y2O3—synthesized by a pH-controlled nitrate-glycine gel-combustion process were studied. These materials were characterized by synchrotron X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS) spectroscopy. Our XRD results indicate that the solid solution with low CaO and Y2O3 contents (6 and 2.8 mol %, respectively) exhibit a tetragonal crystallographic lattice, and those with higher CaO and Y2O3 contents (16 and 12 mol %, respectively) have a cubic lattice. Moreover, our EXAFS study demonstrates that the tetragonal-to-cubic phase transitions, for increasing CaO and Y2O3 contents, are both related to variations in the local symmetry of the Zr–O first neighbor coordination sphere.

Type
Technical Articles
Copyright
Copyright © Cambridge University Press 2008

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