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Characterization of Fine-Grained Bismuth Vanadate Ceramics Obtained Using Nanosized Powders

Shantha, Kundapura and Varma, Kalidindi BR (2000) Characterization of Fine-Grained Bismuth Vanadate Ceramics Obtained Using Nanosized Powders. In: Journal of the American Ceramic Society, 83 (5). pp. 1122-1128.

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Nanocrystalline bismuth vanadate (n-BiV) powders with a crystallite size of <50 mm have been prepared, at room temperature, by subjecting a stoichiometric mixture of bismuth oxide and vanadium pentoxide to mechanical activation. The n-BiV powders show enhanced sinterability, in comparison to the conventionally prepared micrometer-sized bismuth vanadate (m-BiV) powders and yield ceramics with a uniform microstructure. High-density (~98% of the theoretical value), fine-grained (average grain size of ~2 $\mu$m) ceramics, obtained using n-BiV have a high dielectric constant and a high pyroelectric coefficient and are associated with low dielectric loss, both at room temperature and at the transition temperature. These fine-grained ceramics show diffused phase transition and relaxor behavior, which are attributed to the irregular distribution of defects and/or compositional inhomogeneities in these ceramics. The fine-grained ceramics exhibit ferroelectric hysteresis loops with higher remanent polarization and lower coercive field values than the coarse-grained ceramics.

Item Type: Journal Article
Publication: Journal of the American Ceramic Society
Publisher: Blackwell
Additional Information: At present DOI is not working. Copyright of this artical belongs to Blackwell.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 26 Jun 2006
Last Modified: 27 Aug 2008 12:12
URI: http://eprints.iisc.ac.in/id/eprint/7711

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