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Elastic Heterophase Domains in Ferroelectric Epitaxial Films

Published online by Cambridge University Press:  28 October 2011

A. L. Roytburd ,
J. Ouyang ,
B. M. Boyerinas ,
H. A. Bruck ,
J. Slutsker  and
A. Artemev
A. L. Roytburd*
Affiliation:
University of Maryland, College Park, MD 20742, U. S. A.
J. Ouyang*
Affiliation:
Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials (Ministry of Education), Engineering Ceramics Laboratory, School of Materials Science and Engineering, Shandong University, Jinan, Shandong 250061, People’s Republic of China
B. M. Boyerinas
Affiliation:
University of Maryland, College Park, MD 20742, U. S. A.
H. A. Bruck
Affiliation:
University of Maryland, College Park, MD 20742, U. S. A.
J. Slutsker
Affiliation:
University of Maryland, College Park, MD 20742, U. S. A.
A. Artemev
Affiliation:
Carleton University, Ottawa, ON KIS 5B6, Canada.
*
*Corresponding authors: [email protected], [email protected].
*Corresponding authors: [email protected], [email protected].
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Abstract

A heterophase polydomain structure has been recently discovered in BiFeO3 epitaxial ferroelectric films, which provides large electromechanical responses. In this work, the formation of such a microstructure is explained by theory of elastic domains. The thermodynamics of the heterophase polydomain microstructure is analyzed to predict the equilibrium volume fraction of domains at different film-substrate lattice misfits. Extrinsic mechanical and piezoelectric properties are discussed for the heterophase polydomains. It is shown that an applied electric field, which increases electrostatic interaction between domains, may lead to dramatic increase of piezo response. The results of this work are in good agreement with experimental data for BiFeO3.

Keywords

epitaxyferroelectricthin film
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1369: Symposium XX – Computational Studies of Phase Stability and Microstructure Evolution , 2011 , mrss11-1369-xx08-01
Copyright
Copyright © Materials Research Society 2011

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References

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