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Article Dans Une Revue Phase Transitions Année : 2011

Ferroic phase transition sequence in epitaxial BiFeO3 thin films

Résumé

We report a temperature-dependent high-resolution X-ray diffraction investigation of 200nm epitaxial BiFeO3 thin films grown on (001) SrTiO3. We were successful in making epitaxial thin films thermally stable, a key requirement for this study. Our results provide evidence that BiFeO3 undergoes three ghtemperature transitions: an antiferromagnetic transition at 425 C, a first-order - phase transition between 745 C and 780 C and a smoother transition toward the -phase at 860 C. Both the - and - transitions take place 60 C lower than the bulk values whereas the antiferromagnetic transition occurs 55 C higher. This underscores the part played by strain and also emphasizes that BiFeO3 is not a conventional ferroelectric perovskite. Reciprocal space maps reveal the unusual result that the thin films remain monoclinic on crossing the - phase transition. Linear extrapolation of the in-plane lattice parameters to higher temperatures rules out cubic symmetry for the -phase.
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Dates et versions

hal-00601348 , version 1 (17-06-2011)

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Françoise Le Marrec, H. Toupet, C. Lichtensteiger, B. Dkhil, Michael G. Karkut. Ferroic phase transition sequence in epitaxial BiFeO3 thin films. Phase Transitions, 2011, 84, pp.453. ⟨10.1080/014194.2010.549382⟩. ⟨hal-00601348⟩
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