The ferroelectric-paraelectric phase transition in BiFeO3: crystal structure of the orthorhombic beta-phase

Details The ferroelectric-paraelectric phase transition in BiFeO3: crystal structure of the orthorhombic beta-phase The ferroelectric-paraelectric phase transition in BiFeO3: crystal structure of the orthorhombic beta-phase

2008-11-10

arxiv.org/abs/0811.1501v1

Phys. Rev. Lett., 102, 027602, 2009

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.102.027602

A detailed investigation using variable temperature powder neutron diffraction demonstrates that BiFeO3 undergoes a phase transition from the ferroelectric alpha phase (rhombohedral, R3c) to a paraelectric beta phase (orthorhombic, Pbnm) between 820 oC and 830 oC. Co-existence of both phases over a finite temperature interval, together with abrupt changes in key structural parameters, confirm that the transition is firstorder. The beta phase corresponds to the GdFeO3-type perovskite. The metastability of BiFeO3 relative to Bi2Fe4O9 above 810 oC precludes observation of a reported cubic gamma phase above 925 oC under the present experimental conditions.

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