Stabilization of mixed-phase structures in highly strained BiFeO3 thin films via chemical-alloying

Autor:	Eric Breckenfeld, Amber K. Choquette, Anoop R. Damodaran, Lane W. Martin
Rok vydání:	2012
Předmět:	Reciprocal lattice Crystallography Materials science Physics and Astronomy (miscellaneous) Chemical physics Electric field Phase (matter) X-ray crystallography Multiferroics Heterojunction Thin film Epitaxy
Zdroj:	Applied Physics Letters. 100:082904
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.3688175
Popis:	Chemical-alloying is demonstrated to stabilize the mixed-phase structure of highly strained epitaxial BiFeO3/LaAlO3 (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 BiFeO3 thin films can stabilize these mixed-phase structures and delay the onset of epitaxial breakdown.
Databáze:	OpenAIRE
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