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Effect of CeO2 on the reaction kinetics for the formation of Sr0.5Ba0.5CexNb2O6+δ

Published online by Cambridge University Press:  31 January 2011

Jyh-Tzong Shiue  and
Tsang-Tse Fang
Jyh-Tzong Shiue
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan
Tsang-Tse Fang
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan
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Abstract

The solid-state reaction of SrNb2O6, BaNb2O6, and CeO2 to form Sr0.5Ba0.5CexNb2O6+δ at different temperatures and heating rates was investigated. A nonisothermal kinetic empirical model was used to evaluate the activation energy and rate constant of Sr0.5Ba0.5CexNb2O6+δ. The values of the activation energy evaluated from the slopes are 762, 800, and 844 kJ/mol, respectively, for S50, 1CeS50, and 2CeS50, which increase with the increase in Ce doping. The order of reaction was found to decrease with the increase of the Ce doping. A kinetic equation was developed based on the parameters evaluated from the nonisothermal reaction model, which was successfully used to predict the isothermal reaction of Ce-doped strontium barium niobate.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 11 , November 2003 , pp. 2594 - 2599
Copyright
Copyright © Materials Research Society 2003

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