Evidence for a first-order transition from monoclinic α to monoclinic β phase in BiFeO<sub>3</sub> thin films

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Title		Evidence for a first-order transition from monoclinic α to monoclinic β phase in BiFeO₃ thin films
Authors		Toupet, H. Le Marrec, Françoise Lichtensteiger, Céline Dkhil, B. Karkut, M. G.
Published in		Physical Review. B, Condensed Matter. 2010, vol. 81, no. 14
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
Identifiers		DOI: 10.1103/PhysRevB.81.140101
Full text		Article (Published version) (7 MB) - Free access
Structures		Faculté des sciences / Section de physique / Département de physique de la matière quantique
Research group		Groupe Triscone
Citation (ISO format)		TOUPET, H. et al. Evidence for a first-order transition from monoclinic α to monoclinic β phase in BiFeO₃ thin films. In: Physical Review. B, Condensed Matter, 2010, vol. 81, n° 14. https://archive-ouverte.unige.ch/unige:114934