Diffused phase transition in fine-grained bismuth vanadate ceramics

Shantha, K and Varma, KBR (1999) Diffused phase transition in fine-grained bismuth vanadate ceramics. In: Journal of Materials Research, 14 (12). pp. 4651-4656.

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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.

Item Type:	Journal Article
Publication:	Journal of Materials Research
Publisher:	Materials Research Society
Additional Information:	Copyright of this article belongs to Materials Research Society.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	04 Oct 2004
Last Modified:	19 Sep 2010 04:15
URI:	http://eprints.iisc.ac.in/id/eprint/1642

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