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Extrinsic contributions to the grain size dependence of relaxor ferroelectric Pb(Mg1/3Nb2/3)O3: PbTiO3 ceramics

Published online by Cambridge University Press:  31 January 2011

C.A. Randall ,
A.D. Hilton ,
D.J. Barber  and
T.R. Shrout
C.A. Randall
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University, Park, Pennsylvania 16802
A.D. Hilton
Affiliation:
Department of Physics, University of Essex, Wivenhoe Park, Colchester, Essex, United Kingdom
D.J. Barber
Affiliation:
Department of Physics, University of Essex, Wivenhoe Park, Colchester, Essex, United Kingdom
T.R. Shrout
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

This paper addresses the observed grain size with dependence of the dielectric behavior for Pb(Mg1/3Nb2/3)O3: PbTiO3 ceramics grain sizes ≥ 1.0 μm. A combined transmission electron microscopy (TEM) analysis and dielectric characterization are modeled with a modified brick wall approach. From this model, it is possible to extrapolate information such as single crystal values of dielectric maximum, Kmax, the diffuseness coefficient, δ, and the average intergranular thickness for relaxor ceramics. The calculated intergranular thickness agrees well with TEM observations, ≍2.0 nm. This semi-empirical method may be potentially useful in development work of relaxor ceramics to predict the optimized dielectric properties obtainable within microstructural restrictions.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 4 , April 1993 , pp. 880 - 884
Copyright
Copyright © Materials Research Society 1993

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References

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