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Ferroic phase transition sequence in epitaxial BiFeO3 thin films

Le Marrec, F.
Toupet, H.
Dkhil, B.
Karkut, M.G.
Published in Phase Transitions. 2011, vol. 84, no. 5-6, p. 453-473
Abstract We report a temperature-dependent high-resolution X-ray diffraction investigation of 200 nm 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 high-temperature transitions: an antiferromagnetic transition at 425°C, a first-order α–β phase transition between 745°C and 780°C and a smoother transition toward the γ-phase at 860°C. Both the α–β and β–γ 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 α–β phase transition. Linear extrapolation of the in-plane lattice parameters to higher temperatures rules out cubic symmetry for the γ-phase.
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Research group Groupe Triscone
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LE MARREC, F. et al. Ferroic phase transition sequence in epitaxial BiFeO3 thin films. In: Phase Transitions, 2011, vol. 84, n° 5-6, p. 453-473. https://archive-ouverte.unige.ch/unige:23535

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Deposited on : 2012-10-24

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