The Ferroic Phase Transitions of BiFeO3

BiFeO3 displays an abrupt first order transition from the polar structure R3c to centrosymmetric $R\bar 3c$ at TC = 830 °C. The ferroelectric transition is associated with abrupt changes in polar cation displacements and a large discontinuous volume. A continuous volume expansion occurs across the s...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2008-10, Vol.20 (19), p.3692-3696
Main Authors: Selbach, Sverre M., Tybell, Thomas, Einarsrud, Mari-Ann, Grande, Tor
Format: Article
Language:English
Subjects:
ceramics
magnetic materials
piezoelectrics
Online Access:Get full text
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Summary:BiFeO3 displays an abrupt first order transition from the polar structure R3c to centrosymmetric $R\bar 3c$ at TC = 830 °C. The ferroelectric transition is associated with abrupt changes in polar cation displacements and a large discontinuous volume. A continuous volume expansion occurs across the second order antiferromagnetic transition at TN = 370 °C. Electronic conductivity anomalies are associated with both phase transitions.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.200800218