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Origin of Ferroelectricity in Aurivillius Compounds

Published online by Cambridge University Press:  18 March 2011

Donají Y. ,
Suárez Ian M. Reaney  and
William E. Lee
Donají Y.
Affiliation:
Department of Engineering Materials, University of Sheffield, Mappin St, Sheffield, S1 3JD, United Kingdom
Suárez Ian M. Reaney
Affiliation:
Department of Engineering Materials, University of Sheffield, Mappin St, Sheffield, S1 3JD, United Kingdom
William E. Lee
Affiliation:
Department of Engineering Materials, University of Sheffield, Mappin St, Sheffield, S1 3JD, United Kingdom
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Abstract

The structures and microstructures of a range of Aurivillius phases have been investigated using transmission electron microscopy. Superlattice reflections arising from rotations of octahedra around the c-axis have been identified and their intensity at room temperature has been shown to diminish as the tolerance factor of the perovskite blocks increases. The paraelectric to ferroelectric phase transition temperature (Tc) has been monitored using permittivity measurements as a function of temperature and Tc has also been shown to decrease as tolerance factor increases. It is proposed that the onset of octahedral tilting and Tc are related in Aurivillius phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG11.9
Copyright
Copyright © Materials Research Society 2001

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References

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