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Tunability of the dielectric constant of Ba0.1Sr0.9TiO3 ceramics in the paraelectric state

Published online by Cambridge University Press:  03 March 2011

Abdelkader Outzourhit ,
John U. Trefny ,
Tomoko Kito  and
Baki Yarar
Abdelkader Outzourhit
Affiliation:
Department of Physics, Colorado School of Mines, Golden, Colorado 80401–1887
John U. Trefny
Affiliation:
Department of Physics, Colorado School of Mines, Golden, Colorado 80401–1887
Tomoko Kito
Affiliation:
Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401–1887
Baki Yarar
Affiliation:
Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401–1887
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Abstract

Ba1−xSrxTiO3 (x = 0.9) ferroelectric ceramics were prepared successfully using a new wet technique and their structure and dielectric properties compared with those synthesized by the solid-state reaction method. The voltage dependence of the dielectric constant in the paraelectric phase was examined. It was found that the dielectric constants of these materials, prepared by both methods, exhibit large changes with applied voltage in the paraelectric phase. Tunability (the percentage change of the dielectric constant from its zero-bias value in the presence of a de-biasing electric field) was observed to exceed 30% at only 1.7 kV/cm at 77 K in the samples prepared by the solid-state reaction method. The tunability was found to decrease dramatically as the operating temperatures increased above the Curie point. These observations are interpreted in light of an existing phenomenological theory. The dependence of the dielectric constant in the paraelectric state upon a de-biasing electric field is also demonstrated as a potential method for the characterization of dielectric nonuniformities in ferroelectric ceramics.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 6 , June 1995 , pp. 1411 - 1417
Copyright
Copyright © Materials Research Society 1995

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References

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