A Strain-Driven Morphotropic Phase Boundary in BiFeO3

被引：1036

作者：

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. ^{[7
]}

Melville, A. ^{[5
,6
]}

Adamo, C. ^{[5
,6
]}

Sheng, G. ^{[5
]}

Chu, Y. -H. ^{[7
]}

Ihlefeld, J. F. ^{[5
,6
]}

Erni, R. ^{[2
]}

Ederer, C. ^{[8
]}

Gopalan, V. ^{[5
]}

Chen, L. Q. ^{[5
]}

Schlom, D. G. ^{[6
]}

Spaldin, N. A. ^{[3
]}

Martin, L. W. ^{[9
,10
]}

Ramesh, R. ^{[1
,4
,9
]}

机构：

[1] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA

[3] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[4] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[5] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[6] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA

[7] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan

[8] Univ Dublin Trinity Coll, Sch Phys, Coll Green, Dublin 2, Ireland

[9] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

[10] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61822 USA

来源：

SCIENCE | 2009年 / 326卷 / 5955期

基金：

美国国家科学基金会;

关键词：

1ST-PRINCIPLES CALCULATIONS; POLARIZATION; CRYSTAL; FILMS; MECHANISM; ORIGIN;

D O I：

10.1126/science.1177046

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：977 / 980

页数：4

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