The beta-to-gamma Transition in BiFeO<SUB><FONT SIZE='-1'>3</FONT></SUB>: A Powder Neutron Diffraction Study

Arnold, Donna C. and Knight, Kevin S. and Catalan, Gustau and Redfern, Simon A. T. and Scott, James F. and Lightfoot, Philip and Morrison, Finlay D. (2010) The beta-to-gamma Transition in BiFeO<SUB><FONT SIZE='-1'>3</FONT></SUB>: A Powder Neutron Diffraction Study. Advanced Functional Materials, 20 (13). pp. 2116-2123. DOI 10.1002/adfm.201000118

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Official URL: http://dx.doi.org/10.1002/adfm.201000118

Abstract

High-temperature powder neutron diffraction experiments are conducted around the reported beta-gamma phase transition (sim930 °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 °C before complete decomposition into Bi2Fe4O9 (and liquid Bi2O3), which subsequently begins to decompose at approximately 960 °C.

Item Type: Article
Uncontrolled Keywords: 2010; IA61;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Advanced Functional Materials
Volume: 20
Page Range: pp. 2116-2123
Identification Number: 10.1002/adfm.201000118
Depositing User: Sarah Humbert
Date Deposited: 21 Jul 2010 09:00
Last Modified: 23 Jul 2013 09:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/1479

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