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Evidence for a first-order transition from monoclinic α to monoclinic β phase in BiFeO3 thin films

Published inPhysical Review. B, Condensed Matter, vol. 81, no. 14
Publication date2010
Abstract

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 α−β phase transition between 745 and 780 °C and a more diffuse transition toward the γ phase at 860 °C. Reciprocal space maps reveal that thin films remain monoclinic crossing the α−β phase transition. Linear extrapolation of the in-plane lattice parameters to higher temperatures appears to rule out cubic symmetry for the γ phase.

Keywords
  • Epitaxial thin films
  • BiFeO3
  • X-ray diffraction
  • Phase transition
Research group
Citation (ISO format)
TOUPET, H. et al. Evidence for a first-order transition from monoclinic α to monoclinic β phase in BiFeO<sub>3</sub> thin films. In: Physical Review. B, Condensed Matter, 2010, vol. 81, n° 14. doi: 10.1103/PhysRevB.81.140101
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ISSN of the journal1098-0121
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