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Correlation Between Structural Parameters, Polarisabilities and Dielectric Properties in Non-Ferroelectric Complex Perovskites

Published online by Cambridge University Press:  15 February 2011

E. L. Colla  and
N. Setter
E. L. Colla
Affiliation:
Laboratoire de Céramique, EPFL, MX-D Ecublens, 1015 Lausanne, Switzerland, ecolla@mxsgl.epfl.ch.
N. Setter
Affiliation:
Laboratoire de Céramique, EPFL, MX-D Ecublens, 1015 Lausanne, Switzerland, ecolla@mxsgl.epfl.ch.
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Abstract

A combination of different empirical methods which allow the prediction of the dielectric properties of non-ferroelectric complex perovskites has been proposed and its present limits verified. The long term purpose is to engineer new microwave materials with increased relative permittivity ε0 and low thermal coefficient of the resonant frequency τf.

The estimation of the dielectric properties has been accomplished by means of structural predictions based on the tolerance factor and a microscopic model. Furthermore, the optical permittivity based on the Gladstone-Dale relation and the total polarisability according to the molecular/ion additivity rule were also estimated. Ceramics of new compositions were then fabricated and analysed to verify the dielectric properties predicted by the empirical methods. Results show good agreement with the expected structural features and optical permittivities, and the method is sufficiently reliable to estimate the end values, or at least to estimate trends of the dielectric properties induced by partial substitution of cations on site A. The importance of the electronic polarisability on the end value of τε has been demonstrated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 437
Copyright
Copyright © Materials Research Society 1997

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References

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