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The Ferroic Phase Transitions of BiFeO 3
Author(s) -
Selbach Sverre M.,
Tybell Thomas,
Einarsrud MariAnn,
Grande Tor
Publication year - 2008
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200800218
Subject(s) - materials science , phase transition , ferroelectricity , condensed matter physics , antiferromagnetism , polar , volume (thermodynamics) , phase (matter) , electrical resistivity and conductivity , order (exchange) , conductivity , thermodynamics , dielectric , chemistry , physics , optoelectronics , finance , quantum mechanics , astronomy , economics
BiFeO 3 displays an abrupt first order transition from the polar structure R 3 c to centrosymmetric $R\bar 3c$ at T C = 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 T N = 370 °C. Electronic conductivity anomalies are associated with both phase transitions.