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Diffused phase transition in fine-grained 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. e-mail: kbrvarma@mrc.iisc.ernet.in
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Abstract

Nanocrystalline powders of ferroelectric bismuth vanadate, Bi4V2O11 (n-BiV), with crystallite size less than 50 nm, were obtained by mechanical milling of a stoichiometric mixture of bismuth oxide and vanadium pentoxide. The n-BiV powders on sintering yielded high-density, fine-grained ceramics with improved dielectric and polar characteristics. Dielectric studies on samples obtained from milled powders indicated that the ferroelectric-to-paraelectric phase transition temperature is strongly frequency dependent. The Curie–Weiss law is found to be valid only at a temperature away from the transition temperature, confirming the diffused nature of the transition, which is attributed to the presence of compositional inhomogeneity, because of partial reduction of vanadium.

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Articles
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Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4651 - 4656
Copyright
Copyright © Materials Research Society 1999

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