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Dielectric, piezoelectric, and pyroelectric anisotropy in KCl-modified grain-oriented bismuth vanadate ceramics

Published online by Cambridge University Press:  31 January 2011

K. Shantha  and
K. B. R. Varma
K. Shantha
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore-560 012, India
K. B. R. Varma*
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore-560 012, India
*
a)Address all correspondence to this author.
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Abstract

The effect of the additive KCl, on the structural, microstructural, and polar properties of bismuth vanadate (BiV) ceramics is investigated. The scanning electron microscopic (SEM) studies reveal a remarkable modification in the microstructure and the occurrence of high grain-orientation (75%) on KCl addition. The energy dispersive x-ray (EDX) analyses indicate the presence of chemically inhomogeneous distribution of KCl, with core-shell-like grain structure. The KCl-modified BiV samples exhibit a broad and depressed phase transition, with no frequency dispersion, as a result of the increased internal stress and the formation of core-shell-like grain structure. Significant anisotropies are observed in the dielectric, piezoelectric, and pyroelectric responses of these grain-oriented ceramic samples. These samples are characterized by near rectangular ferroelectric hysteresis loops, with a significant anisotropy in the Pr (Pr┴/Pr∥ = 2.43, at 300 K) and Ec (Ec∥/Ec┴= 2.22, at 300 K) values between the directions parallel and perpendicular to the cold-pressing axis.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 476 - 486
Copyright
Copyright © Materials Research Society 1999

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