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Kinetic Analysis of PbTiO3 Phase Formation Via Diffusion Couple Method

Published online by Cambridge University Press:  21 March 2011

Yun-Mo Sung  and
Woo-Chul Kwack
Yun-Mo Sung
Affiliation:
Department of Materials Science & Engineering, Daejin University Pochun-koon, Kyunggi-do 487-711Korea(South)
Woo-Chul Kwack
Affiliation:
Department of Materials Science & Engineering, Daejin University Pochun-koon, Kyunggi-do 487-711Korea(South)
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Abstract

A detail kinetic analysis was performed on the PbTiO3 phase formation reaction occurring via PbO-TiO2 diffusion couple experiments. The diffusion model of Pb2+ and O2− ions was used to derive the kinetics equation of PbTiO3 phase formation reaction. From the parabolic kinetics between the thickness of PbTiO3 layer and time, the reaction rate constant for PbTiO3 formation was determined to be a function of the average diffusion coefficient of Pb2+ ions. By substituting the diffusion couple experimental results into the present kinetics equation, average diffusion coefficient values of Pb2+ ions in PbTiO3 layer were calculated according to temperature values. The activation energy value for the diffusion of Pb2+ ions was estimated for PbTiO3 formation using Arrhenius plot and the equation for the diffusion coefficient of Pb2+ ions was determined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 666: Symposium F – Transport and Microstructural Phenomena , 2001 , F7.5
Copyright
Copyright © Materials Research Society 2001

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References

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