Fabrication and Characterization of Grain-Oriented Bismuth Vanadate Ceramic

Shantha, K and Varma, KBR (1997) Fabrication and Characterization of Grain-Oriented Bismuth Vanadate Ceramic. In: Materials Research Bulletin, 32 (11). pp. 1581-1591.

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Abstract

Grain-oriented (GO; 79%), high density (96% of the theoretical value) ceramics of bismuth vanadate, $Bi_2VO_{5.5}$, have been fabricated via a liquidphase- aided two-stage sintering process. Scanning electron microscopy (SEM) was employed to monitor the crystallite size and the morphology of the starting powders and the microstructure of the sintered ceramics. X-ray diffraction (XRD) studies were carried out to verify the grain-orientation in the ceramics. The dielectric constant and the conductivity studies carried out along the directions perpendicular and parallel to the pressing axis show significant anisotropies (1.7 and 5.3, respectively," at "30CT K). The grainoriented ceramics were found to exhibit improved ferroelectric properties, with higher remnant polarization $(P_r)$ and lower coercive field $(E_c)$ than those of the randomly oriented (RO) ceramics.

Item Type:	Journal Article
Publication:	Materials Research Bulletin
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	A.ceramics;B.chemical synthesis;C.electron microscopy;D.dielectric properties;D.ferroelectricity
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	21 Mar 2007
Last Modified:	19 Sep 2010 04:35
URI:	http://eprints.iisc.ac.in/id/eprint/9804

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