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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.

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

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