Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Advanced functional materials, 2010-07, Vol.20 (13), p.2116-2123

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2010

Link zum Volltext

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• High‐temperature powder neutron diffraction experiments are conducted around the reported β–γ phase transition (∼930 °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 β‐ and γ‐phase of BiFeO3 exhibit orthorhombic symmetry; i.e., no further increase of symmetry occurs during this transition. The γ‐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. High‐temperature powder neutron diffraction experiments conducted around the reported β–γ phase transition (∼930 °C) in BiFeO3 demonstrate that while a small volume contraction is observed at the transition temperature, consistent with an insulator–metal transition, both the β‐ and γ‐phase of BiFeO3 exhibit orthorhombic (Pbnm) symmetry.