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Stabilization of mixed-phase structures in highly strained BiFeO 3 thin films via chemical-alloying
Authors
E Breckenfeld
AK Choquette
AR Damodaran
LW Martin
Publication date
20 February 2012
Publisher
eScholarship, University of California
Abstract
Chemical-alloying is demonstrated to stabilize the mixed-phase structure of highly strained epitaxial BiFeO 3/LaAlO 3 (001) heterostructures. Such mixed-phase structures are essential for the large electromechanical responses (4%-5% strains under applied electric field); however, films with thickness exceeding 250 nm undergo an epitaxial breakdown to a non-epitaxial bulk-like rhombohedral-phase. Such an irreversible transformation of the mixed-phase structure limits the magnitude of the net surface displacement associated with these field-induced phase transformations. Using high-resolution x-ray diffraction reciprocal space mapping and scanning-probe-based studies, we show that chemical-alloying of BiFeO 3 thin films can stabilize these mixed-phase structures and delay the onset of epitaxial breakdown. © 2012 American Institute of Physics
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Last time updated on 25/12/2021