The β-to-γ transition in BiFeO 3: A powder neutron diffraction study

Donna C. Arnold; Kevin S. Knight; Gustau Catalan; Simon A.T. Redfern; James F. Scott; Philip Lightfoot; Finlay D. Morrison

doi:10.1002/adfm.201000118

The β-to-γ transition in BiFeO ₃: A powder neutron diffraction study

Donna C. Arnold, Kevin S. Knight, Gustau Catalan, Simon A.T. Redfern, James F. Scott, Philip Lightfoot, Finlay D. Morrison

Research output: Contribution to journal › Article › peer-review

88 Citations (Scopus)

Abstract

High-temperature powder neutron diffraction experiments are conducted around the reported β-γ phase transition (∼930 °C) in BiFeO ₃. The results demonstrate that while a small volume contraction is observed at the transition temperature, consistent with an insulator-metal transition, both the b-and g-phase of BiFeO ₃ exhibit orthorhombic symmetry; i.e., no further increase of symmetry occurs during this transition. The g-orthorhombic phase is observed to persist up to a temperature of approximately 950 °C before complete decomposition into Bi ₂Fe ₄O ₉ (and liquid Bi ₂O ₃), which subsequently begins to decompose at approximately 960 °C.

Original language	English
Pages (from-to)	2116-2123
Number of pages	8
Journal	Advanced Functional Materials
Volume	20
Issue number	13
DOIs	https://doi.org/10.1002/adfm.201000118
Publication status	Published - Jul 9 2010
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
General Chemistry
Biomaterials
General Materials Science
Condensed Matter Physics
Electrochemistry

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10.1002/adfm.201000118

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abstract = "High-temperature powder neutron diffraction experiments are conducted around the reported β-γ phase transition (∼930 °C) in BiFeO 3. The results demonstrate that while a small volume contraction is observed at the transition temperature, consistent with an insulator-metal transition, both the b-and g-phase of BiFeO 3 exhibit orthorhombic symmetry; i.e., no further increase of symmetry occurs during this transition. The g-orthorhombic phase is observed to persist up to a temperature of approximately 950 °C before complete decomposition into Bi 2Fe 4O 9 (and liquid Bi 2O 3), which subsequently begins to decompose at approximately 960 °C.",

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T1 - The β-to-γ transition in BiFeO 3

T2 - A powder neutron diffraction study

AU - Arnold, Donna C.

AU - Knight, Kevin S.

AU - Catalan, Gustau

AU - Redfern, Simon A.T.

AU - Scott, James F.

AU - Lightfoot, Philip

AU - Morrison, Finlay D.

PY - 2010/7/9

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N2 - High-temperature powder neutron diffraction experiments are conducted around the reported β-γ phase transition (∼930 °C) in BiFeO 3. The results demonstrate that while a small volume contraction is observed at the transition temperature, consistent with an insulator-metal transition, both the b-and g-phase of BiFeO 3 exhibit orthorhombic symmetry; i.e., no further increase of symmetry occurs during this transition. The g-orthorhombic phase is observed to persist up to a temperature of approximately 950 °C before complete decomposition into Bi 2Fe 4O 9 (and liquid Bi 2O 3), which subsequently begins to decompose at approximately 960 °C.

AB - High-temperature powder neutron diffraction experiments are conducted around the reported β-γ phase transition (∼930 °C) in BiFeO 3. The results demonstrate that while a small volume contraction is observed at the transition temperature, consistent with an insulator-metal transition, both the b-and g-phase of BiFeO 3 exhibit orthorhombic symmetry; i.e., no further increase of symmetry occurs during this transition. The g-orthorhombic phase is observed to persist up to a temperature of approximately 950 °C before complete decomposition into Bi 2Fe 4O 9 (and liquid Bi 2O 3), which subsequently begins to decompose at approximately 960 °C.

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The β-to-γ transition in BiFeO ₃: A powder neutron diffraction study

Abstract

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