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Grain-Size Effects on Diffuse Phase Transitions of Batio3 Ceramics Obtained by Alkoxide Precursors

Published online by Cambridge University Press:  21 February 2011

R. P. S. M. Lobo ,
R. L. Moreira  and
N. D. S. Mohallem
R. P. S. M. Lobo
Affiliation:
Departamentos de Fisica e de Quimica, ICEx, UFMG, C. P. 702, CEP 30161-970 Belo Horizonte, MG, Brazil
R. L. Moreira
Affiliation:
Departamentos de Fisica e de Quimica, ICEx, UFMG, C. P. 702, CEP 30161-970 Belo Horizonte, MG, Brazil
N. D. S. Mohallem
Affiliation:
Departamentos de Fisica e de Quimica, ICEx, UFMG, C. P. 702, CEP 30161-970 Belo Horizonte, MG, Brazil
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Abstract

Barium titanate ceramics have been obtained by sol-gel methods. The dielectric investigations of these materials revealed the existence of diffuse ferroelectric transitions. By using a phenomenological model, we could demonstrate the existence of a simple relationship between the diffuse character of the transition and the sample grain-size. This effect has been attributed to interactions between charged defects on the grain surfaces and the spontaneous polarization of the material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 309
Copyright
Copyright © Materials Research Society 1998

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References

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