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High temperature phase transitions in BiFeO3

Arnold, Donna C., Kavanagh, C.M., Lightfoot, P., Morrison, F.D. (2009) High temperature phase transitions in BiFeO3. In: Symposium F – Multiferroic and Ferroelectric Materials. 1199. pp. 77-82. ISBN 0272 9172. (doi:10.1557/PROC-1199-F11-08) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:49063)

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The high temperature phases of BiFeO3 have courted much controversy with many conflicting structural models reported, in particular for the paraelectric ?-phase. High temperature powder neutron diffraction (PND) experiments indicate that the ferroelectric (R3c) ?-phase transforms to the paraelectric ?-phase at approximately 820°C via a first order phase transition. We demonstrate that this phase is unambiguously orthorhombic, adopting the GdFeO3 structure-type with a space group Pbnm. On further heating BiFeO3 undergoes another first order phase transition (?-?) at approximately 930°C which is marked by a discontinuous decrease in cell volume consistent with an insulator-metal transition. Close inspection of the PND data show no evidence of any symmetry change, with the postulated ?-phase remaining orthorhombic Pbnm. In addition we present PND and impedance spectroscopy data for BiFeO3 which suggest that the so-called 'Polomska' transition observed by some authors at approximately 185°C is not intrinsic.

Item Type: Conference or workshop item (Proceeding)
DOI/Identification number: 10.1557/PROC-1199-F11-08
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Mater Res Soc Symp Proc [Field not mapped to EPrints] AD - School of Chemistry, University of St. Andrews, North Haugh, St Andrews, Fife, KY16 9ST, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints] A4 - Advanced Diamond Technologies Inc.; AGD Material CO, Ltd; Apollo Diamond; Applied Diamond Inc; CEA-LIST [Field not mapped to EPrints] C3 - Materials Research Society Symposium Proceedings [Field not mapped to EPrints]
Uncontrolled keywords: First-order phase transitions, High temperature, High temperature phase transitions, High-temperature phasis, Impedance spectroscopy, In-cell, Insulator metal transition, Paraelectrics, Phase transform, Powder neutron diffraction, Space Groups, Structural models, Symmetry changes, Ferroelectricity, Metal insulator transition, Model structures, Ferroelectric materials
Subjects: Q Science > QC Physics > QC176 Solid state physics
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: Giles Tarver
Date Deposited: 07 Jul 2015 11:03 UTC
Last Modified: 16 Feb 2021 13:25 UTC
Resource URI: (The current URI for this page, for reference purposes)
Arnold, Donna C.:
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