A Strain-Driven Morphotropic Phase Boundary in BiFeO3

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

Research output: Contribution to journalArticlepeer-review

846 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)977-980
Number of pages4
JournalScience
Volume326
Issue number5955
DOIs
Publication statusPublished - 13 Nov 2009

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