Publication Date:
2009-12-08
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zeches, R J -- Rossell, M D -- Zhang, J X -- Hatt, A J -- He, Q -- Yang, C-H -- Kumar, A -- Wang, C H -- Melville, A -- Adamo, C -- Sheng, G -- Chu, Y-H -- Ihlefeld, J F -- Erni, R -- Ederer, C -- Gopalan, V -- Chen, L Q -- Schlom, D G -- Spaldin, N A -- Martin, L W -- Ramesh, R -- New York, N.Y. -- Science. 2009 Nov 13;326(5955):977-80. doi: 10.1126/science.1177046.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94720, USA. rzeches@berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19965507" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
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Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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