The β-to-γ Transition in BiFeO3: A Powder Neutron Diffraction Study

Donna Claire Arnold, K. S. Knight, G. Catalan, S. A. T. Redfern, James Floyd Scott, Philip Lightfoot, Finlay D. Morrison

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)


High-temperature powder neutron diffraction experiments are conducted around the reported beta-gamma phase transition (similar to 930 degrees C) in BiFeO3. The results demonstrate that while a small volume contraction is observed at the transition temperature, consistent with an insulator-metal transition, both the beta- and gamma-phase of BiFeO3 exhibit orthorhombic symmetry; i.e., no further increase of symmetry occurs during this transition. The gamma-orthorhombic phase is observed to persist up to a temperature of approximately 950 degrees C before complete decomposition into Bi2Fe4O9 (and liquid Bi2O3), which subsequently begins to decompose at approximately 960 degrees C.
Original languageEnglish
Pages (from-to)2116-2123
Number of pages8
JournalAdvanced Functional Materials
Issue number13
Early online date8 Jun 2010
Publication statusPublished - 9 Jul 2010


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