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Compositional tuning of the strain-induced structural phase transition and of ferromagnetism in Bi1−xBaxFeO3−δ

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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 σc necessary to induce this transition can be reduced significantly by substituting 10% Ba for Bi [Bi0.9Ba0.1FeO3−δ (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.

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Acknowledgment

This research was supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division (C.J.C.B., H.S.K., M.V., H.M.M., and H.M.C.), and Scientific User Facilities Division (M.D.B.). D.P.N. acknowledges support by Army Research Office and National Science Foundation under Grant No. 0704240 (AFH). We thank J.T. Luck for specimen preparation.

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Authors and Affiliations

  1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA

    Charlee J.C. Bennett, Hyun Sik Kim, Maria Varela, Dae Ho Kim, Harry M. Meyer & Hans M. Christen

  2. Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom

    Hyun Sik Kim

  3. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA

    Michael D. Biegalski & Hans M. Christen

  4. Department of Physics, Tulane University, New Orleans, Louisiana, 70118, USA

    Dae Ho Kim

  5. Department of Materials Science and Engineering, University of Florida, Gainesville, Florida, 32611, USA

    David P. Norton

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  1. Charlee J.C. Bennett
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Correspondence to Hans M. Christen.

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Bennett, C.J., Kim, H.S., Varela, M. et al. Compositional tuning of the strain-induced structural phase transition and of ferromagnetism in Bi1−xBaxFeO3−δ. Journal of Materials Research 26, 1326–1331 (2011). https://doi.org/10.1557/jmr.2011.59

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