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)
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. | |
Official URL: https://doi.org/10.1557/PROC-1199-F11-08 |
Abstract
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) |
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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 > Physics and Astronomy |
Depositing User: | Giles Tarver |
Date Deposited: | 07 Jul 2015 11:03 UTC |
Last Modified: | 16 Nov 2021 10:20 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/49063 (The current URI for this page, for reference purposes) |
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