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A Strain-Driven Morphotropic Phase Boundary in BiFeO3

by Ederer, C. , Chu, Y.-H. , Wang, C. H. , Melville, A. , Schlom, D. G. , Kumar, A. , Ihlefeld, J. F. , Zeches, R. J. , Hatt, A. J. , He, Q. , Spaldin, N. A. , Sheng, G. , Erni, R. , Zhang, J. X. , Rossell, M. D. , Ramesh, R. , Yang, C.-H. , Chen, L. Q. , Adamo, C. , Gopalan, V. , Martin, L. W.

in Acoustical engineering / Chemical compounds / Data storage / Electric fields / Electrical phases / Image contrast / Lattice parameters / Lead / Material films / Materials / Materials science / Perovskites

2009

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A Strain-Driven Morphotropic Phase Boundary in BiFeO3

2009

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2009

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Journal Article

A Strain-Driven Morphotropic Phase Boundary in BiFeO3

Ederer, C.,

Chu, Y.-H.,

Wang, C. H.,

Melville, A.,

Schlom, D. G.,

Kumar, A.,

Ihlefeld, J. F.,

Zeches, R. J.,

Hatt, A. J.,

He, Q.,

Spaldin, N. A.,

Sheng, G.,

Erni, R.,

Zhang, J. X.,

Rossell, M. D.,

Ramesh, R.,

Yang, C.-H.,

Chen, L. Q.,

Adamo, C.,

Gopalan, V.,

Martin, L. W.

2009

Overview

Piezoelectric materials, which convert mechanical to electrical energy and vice versa, are typically characterized by the intimate coexistence of two phases across a morphotropic phase boundary. Electrically switching one to the other yields large electromechanical coupling coefficients. Driven by global environmental concerns, there is currently a strong push to discover practical lead-free piezoelectrics for device engineering. Using a combination of epitaxial growth techniques in conjunction with theoretical approaches, we show the formation of a morphotropic phase boundary through epitaxial constraint in lead-free piezoelectric bismuth ferrite (BiFeO3) films. Electric field–dependent studies show that a tetragonal-like phase can be reversibly converted into a rhombohedral-like phase, accompanied by measurable displacements of the surface, making this new lead-free system of interest for probe-based data storage and actuator applications.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science

Subject

Acoustical engineering