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Structural Characterization and Ionic Conductivity of Metastable Gd2(Ti0.65Zr0.35)2O7 Powders Prepared by Mechanical Milling

Published online by Cambridge University Press:  26 February 2011

Antonio F. Fuentes ,
Karla J. Moreno ,
Jacobo Santamaria ,
Carlos Leon  and
Ulises Amador
Antonio F. Fuentes
Affiliation:
antonio.fernandez@cinvestav.edu.mx, Cinvestav, Unidad Saltillo, Carretera Saltillo-Monterrey Km. 13, Ramos Arizpe, Coahuila, 25900, Mexico
Karla J. Moreno
Affiliation:
karla.moreno@cinvestav.edu.mx, Cinvestav, Unidad Saltillo, Carretera Saltillo-Monterrey Km. 13, Ramos Arizpe, Coahuila, 25900, Mexico
Jacobo Santamaria
Affiliation:
jacsan@fis.ucm.es, Facultad de Fisica, Universidad Complutense, Departamento de Fisica Aplicada III, Madrid, 28040, Spain
Carlos Leon
Affiliation:
carletas@fis.ucm.es, Facultad de Fisica, Universidad Complutense, Departamento de Fisica Aplicada III, Madrid, 28040, Spain
Ulises Amador
Affiliation:
uamador@ceu.es, Facultad de Farmacia, Universidad San Pablo-CEU, Departamento de Quimica, Boadilla del Monte, Madrid, 28668, Spain
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Abstract

We analyze in this work the influence of ordering on the oxygen ion dynamics in the ionic conductor Gd2(Ti0.65Zr0.35)2O7, prepared by mechanical milling. As-prepared powder phase presents a metastable anion deficient fluorite-type of structure below 800°C becoming a disordered pyrochlore above this temperature. Such phase transformation implies a significant increase in the ionic conductivity of this material as a result of a systematic decrease in the activation energy for the dc conductivity, from 1.23 to 0.78 eV. Electrical conductivity relaxation is well described by the Kohlrausch-Williams-Watts (KWW) stretched exponential function with the fractional exponent n decreasing systematically with increasing sintering temperature (increasing ordering) as a result of decreasing ion-ion interactions in better ordered samples.

Keywords

ionic conductormechanical alloyingx-ray diffraction (XRD)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA09-04
Copyright
Copyright © Materials Research Society 2007

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References

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