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High Temperature Phase Transitions in BiFeO3

Published online by Cambridge University Press:  31 January 2011

Donna Arnold,
Christopher M Kavanagh,
Philip Lightfoot and
Finlay Doogan Morrison
Donna Arnold
Affiliation:
donna.arnold@st-andrews.ac.uk
Christopher M Kavanagh
Affiliation:
ck427@st-andrews.ac.uk, University of St Andrews, School of Chemistry, St Andrews, United Kingdom
Philip Lightfoot
Affiliation:
pl@st-andrews.ac.uk, University of St Andrews, School of Chemistry, North Haugh, St Andrews, Fife, KY16 9ST, United Kingdom, 0044 1334 463855, 0044 1334 463805
Finlay Doogan Morrison
Affiliation:
finlay.morrison@st-andrews.ac.uk, University of St Andrews, School of Chemistry, North Haugh, St Andrews, Fife, KY16 9ST, United Kingdom, 0044 1334 463855, 0044 1334 463805
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Abstract

The high temperature phases of BiFeO3 have courted much controversy with many conflicting structural models reported, in particular for the paraelectric β-phase. High temperature powder neutron diffraction (PND) experiments indicate that the ferroelectric (R3c) α-phase transforms to the paraelectric β-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 (β-γ) 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 γ-phase remaining orthorhombic Pbnm. In addition we present PND and impedance spectroscopy data for BiFeO3 which suggest that the so-called ‘Połomska’ transition observed by some authors at approximately 185 °C is not intrinsic.

Keywords

crystallographic structureferroelectricphase transformation

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1199: Symposium F –Multiferroic and Ferroelectric Materials , 2009, 1199-F11-08
Copyright
Copyright © Materials Research Society 2010

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