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Aspects of solid state formation and properties of Sn0.9Ti0.1O2 system doped with CoO and Nb2O5

Published online by Cambridge University Press:  06 March 2012

Daniela Russo Leite ,
Márcio de Sousa Góes ,
Paulo Roberto Bueno ,
José Arana Varela ,
Carlos de Oliveira Paiva-Santos  and
Mario Cilense
Daniela Russo Leite
Affiliation:
Departamento de Físico Química, Instituto de Química, Universidade Estadual Paulista, Rua Prof. Francisco Degni s/n, Quitandinha, 14800-900 Araraquara, São Paulo, Brazil
Márcio de Sousa Góes*
Affiliation:
Departamento de Físico Química, Instituto de Química, Universidade Estadual Paulista, Rua Prof. Francisco Degni s/n, Quitandinha, 14800-900 Araraquara, São Paulo, Brazil
Paulo Roberto Bueno
Affiliation:
Departamento de Físico Química, Instituto de Química, Universidade Estadual Paulista, Rua Prof. Francisco Degni s/n, Quitandinha, 14800-900 Araraquara, São Paulo, Brazil
José Arana Varela
Affiliation:
Departamento de Físico Química, Instituto de Química, Universidade Estadual Paulista, Rua Prof. Francisco Degni s/n, Quitandinha, 14800-900 Araraquara, São Paulo, Brazil
Carlos de Oliveira Paiva-Santos
Affiliation:
Departamento de Físico Química, Instituto de Química, Universidade Estadual Paulista, Rua Prof. Francisco Degni s/n, Quitandinha, 14800-900 Araraquara, São Paulo, Brazil
Mario Cilense
Affiliation:
Departamento de Físico Química, Instituto de Química, Universidade Estadual Paulista, Rua Prof. Francisco Degni s/n, Quitandinha, 14800-900 Araraquara, São Paulo, Brazil
*
a)Author to whom correspondence should be addressed. Electronic mail: marcgoes@iq.unesp.br; Tel +55 16 33016640; Fax: +55 16 33227932
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Abstract

The effect of calcination temperature during the formation of the solid solution Sn0.9Ti0.1O2 doped with 1.00 mol % CoO and 0.05 mol % Nb2O5 is presented. The structural characteristics of this system were studied using X-ray diffraction, and the changes in phase formation were analyzed using the Rietveld method. With an increase in calcination temperature, there is increasing miscibility of Ti into the (Ti,Sn)O2 phase and near 1000 °C, and the remaining TiO2 (anatase) was transformed into the rutile phase. The sintering process, monitored using dilatometry, suggests two mass transport mechanisms, one activated close to 900 °C associated with the presence of TiO2 (anatase) and the second mechanism, occurring between 1200 and 1300 °C, is attributed to a faster grain boundary diffusion caused by oxygen vacancies.

Keywords

electronic materialsSnO2TiO2X-ray diffractionRietveld refinement
Type
Technical Articles
Information
Powder Diffraction , Volume 23 , Special Issue S1 , March 2008 , pp. S65 - S69
Copyright
Copyright © Cambridge University Press 2008

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