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Kinetics of PbTiO3 perovskite phase formation via an interfacial reaction

Published online by Cambridge University Press:  31 January 2011

Yun-Mo Sung ,
Woo-Chul Kwak  and
Sungtae Kim
Yun-Mo Sung*
Affiliation:
Advanced Nonomaterials Laboratory (ANL), Department of Materials Science and Engineering, Daejin University, Pochun-koon, Kyunggi-do 487–711, Korea (South)
Woo-Chul Kwak
Affiliation:
Advanced Nonomaterials Laboratory (ANL), Department of Materials Science and Engineering, Daejin University, Pochun-koon, Kyunggi-do 487–711, Korea (South)
Sungtae Kim
Affiliation:
Department of Materials Science & Engineering, University of Wisconsin—Madison, Madison, Wisconsin 53706
*
a) Address all correspondence to this author. e-mail: ymsung@road.daejin.ac.kr
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Abstract

The kinetics of the formation of PbTiO3 at the PbO/TiO2 interface has been analyzed. The flux of Pb2+ and O2− ions through the PbTiO3 layer was used to derive the kinetics equation for the formation of the PbTiO3 phase. On the basis of the parabolic growth kinetics of the PbTiO3 interlayer, the reaction rate constant (k) for PbTiO3 formation was determined as a function of the average diffusion coefficient of the Pb2+ ions (DPb2+). By employment of the data from diffusion couple experiments and the free energy values for the formation of the PbTiO3 phase () into the present kinetics equation, DPb2+ in the PbTiO3 interlayer was calculated with respect to the corresponding temperature. The activation energy for diffusion (Q) and the diffusion constant (D0) of Pb2+ ions in the PbTiO3 layer could be evaluated from the Arrhenius plot of DPb2+.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 2 , February 2002 , pp. 407 - 412
Copyright
Copyright © Materials Research Society 2002

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References

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