A Strain-Driven Morphotropic Phase Boundary in BiFeO 3

Author:

Zeches R. J.1,Rossell M. D.2,Zhang J. X.1,Hatt A. J.3,He Q.4,Yang C.-H.4,Kumar A.5,Wang C. H.6,Melville A.57,Adamo C.57,Sheng G.5,Chu Y.-H.6,Ihlefeld J. F.57,Erni R.2,Ederer C.8,Gopalan V.5,Chen L. Q.5,Schlom D. G.7,Spaldin N. A.3,Martin L. W.910,Ramesh R.149

Affiliation:

1. Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94720, USA.

2. National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

3. Materials Department, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.

4. Department of Physics, University of California, Berkeley, Berkeley, CA 94720, USA.

5. Department of Materials Science and Engineering, Pennsylvania State University, State College, PA 16802, USA.

6. Department of Materials Science and Engineering, National Chiao Tung University, HsinChu, Taiwan 30010.

7. Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.

8. School of Physics, Trinity College Dublin, College Green, Dublin 2, Ireland.

9. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

10. Department of Materials Science and Engineering, University of Illinois, Urbana-Champaign, Urbana, IL 61822, USA.

Abstract

Biffed into Shape BiFeO 3 is known to have a very large ferroelectric polarization. Although the bulk ground state is rhombohedral (with the electrical polarization along the [111] direction), in thin films and under epitaxial strain, the material can be tetragonally distorted (polarization along [001]). Zeches et al. (p. 977 ) show that under compressive strain, these films are monoclinic, a phase that is highly stable because it comprises the same symmetry as the monoclinic phase which has been reported at the so-called morphotropic phase boundaries in technologically important ferroelectrics. This work offers the possibility of obtaining large piezoelectric responses in lead-free systems.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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