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Relation between tolerance factor and Tc in Aurivillius compounds

Published online by Cambridge University Press:  31 January 2011

Donají Y. Suárez,
Ian M. Reaney and
William E. Lee
Donají Y. Suárez
Affiliation:
Department of Engineering Materials, University of Sheffield, Mappin St, Sheffield, S1 3JD, United Kingdom
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 were investigated by transmission electron microscopy. Systematic rows of superlattice reflections arising from tilting of octahedra around the c axis were identified, and their intensities at room temperature were shown to diminish as the tolerance factor (t) of the perovskite blocks increased. For compounds with t's approaching 1, no superlattice reflections were observed. the paraelectric-to-ferroelectric phase transition temperature (Tc) was monitored through permittivity measurements as a function of temperature, and Tc was also shown to decrease as t increased. Consequently, the onset of octahedral tilting and Tc appeared to be strongly related Aurivillius phases. Planar defects arising from the structural phase transitions and from stacking irregularities were also discussed.

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Articles
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Journal of Materials Research , Volume 16 , Issue 11 , November 2001, pp. 3139 - 3149
Copyright
Copyright © Materials Research Society 2001

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