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Science 326 , 977 (2009)

A Strain-Driven Morphotropic Phase Boundary in BiFeO 3. 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,

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Science 326 , 977 (2009)

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  1. 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. Martin, and R. Ramesh NSF DMR-0820404, DMR-0507146, DMR-0940420, NIRT-0609377, DOE DH 25DE-AC02-05CH11231 and DE-FG02-07ER46417 Science 326, 977 (2009) Piezoelectric materials, which convert mechanical to electrical energy and vice versa, typically require the coexistence of two phases across a morphotropic phase boundary. Electrically switching between phases yields large electromechanical coupling. Using epitaxial constraints, MRSEC researchers have generated a morphotropic phase boundary in lead-free piezoelectric bismuth ferrite films, BiFeO3. A tetragonal-like phase can be reversibly converted into a rhombohedral-like phase by application of electric field, accompanied by measurable displacements of the surface. This new lead-free system is of interest for probe-based data storage and actuator applications.

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