Compositional tuning of the strain-induced structural phase transition and of ferromagnetism in Bi1-xBaxFeO3-[delta]

Abstract Recent studies by a number of research groups have shown that the structure of epitaxial BiFeO3 (BFO) films changes drastically as a function of substrate-induced biaxial compression, with the crystal structure changing from one being nearly rhombohedral (R-like) to one being nearly tetrago...

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Bibliographic Details
Published in:Journal of materials research 2011-05, Vol.26 (10), p.1326
Main Authors: Bennett, Charlee J C, Kim, Hyun Sik, Varela, Maria, Biegalski, Michael D, Kim, Dae Ho, Norton, David P, Meyer, Harry M, Christen, Hans M
Format: Article
Language:English
Subjects:
Analysis
Chemical engineering
Crystals
Electrons
Lasers
Materials research
Phase transitions
Solid solutions
Studies
Temperature
Transmission electron microscopy
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Summary:Abstract Recent studies by a number of research groups have shown that the structure of epitaxial BiFeO3 (BFO) films changes drastically as a function of substrate-induced biaxial compression, with the crystal structure changing from one being nearly rhombohedral (R-like) to one being nearly tetragonal (T-like), where the "T-like" structure is characterized by a highly enhanced c/a ratio of out-of-plane c to in-plane a lattice parameters. In this work, we show that the critical compressive strain [sigma]c necessary to induce this transition can be reduced significantly by substituting 10% Ba for Bi [Bi0.9Ba0.1FeO3-[delta] (BBFO)] and that the "T-like" phase in both BBFO and BFO is stable up to the decomposition temperatures of the films in air. Furthermore, our results show that the BBFO solid solution shows clear ferromagnetic properties in contrast to its undoped BFO counterpart.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2011.59