Evidence for a first-order transition from monoclinic alpha to monoclinic beta phase in BiFeO3 thin films - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2010

Evidence for a first-order transition from monoclinic alpha to monoclinic beta phase in BiFeO3 thin films

Résumé

We report a temperature-dependent high-resolution x-ray diffraction investigation of 200-nm epitaxial BiFeO3 thin films grown on (001) SrTiO3. We find that BiFeO3 undergoes two high-temperature transitions: a first-order alpha-beta phase transition between 745 and 780 degrees C and a more diffuse transition toward the gamma phase at 860 degrees C. Reciprocal space maps reveal that thin films remain monoclinic crossing the alpha-beta phase transition. Linear extrapolation of the in-plane lattice parameters to higher temperatures appears to rule out cubic symmetry for the gamma phase.

Dates et versions

hal-00582907 , version 1 (04-04-2011)

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H. Toupet, Françoise Le Marrec, C. Lichtensteiger, B. Dkhil, Michael G. Karkut. Evidence for a first-order transition from monoclinic alpha to monoclinic beta phase in BiFeO3 thin films. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 81 (14), pp.140101. ⟨10.1103/PhysRevB.81.140101⟩. ⟨hal-00582907⟩
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