Hydrothermal preparation of Ba(Ti,Zr)O3 fine powders

Vivekanandan, R and Philip, Sam and Kutty, TRN (1987) Hydrothermal preparation of Ba(Ti,Zr)O3 fine powders. In: Materials Research Bulletin, 22 (1). pp. 99-108.

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Abstract

Fine powders consisting of aggregated submicron crystallites of Ba(Ti,Zr)O3 in the complete range of Ti/Zr ratios are prepared at 85–130°C by hydrothermal method, starting from TiO2 + ZrO2 · xH2O mixed gel and Ba(OH)2 solution. The products obtained below 110°C incorporate considerable amounts of H2O and OH− within the lattice. As-prepared BaTiO3 is cubic and converts to tetragonal phase after the heat treatment at 1200°C, accompanied by the loss of residual hydroxyl ions. TEM investgations of the growth features show a transformation of the gel to the crystallite. Ba2+ ions entering the gel produce chemical changes within the gel, followed by dehydration, resulting in a cubic perovskite phase irrespective of Ti/Zr. The sintering properties of these powders to fine-grained, high density ceramics and their dielectric properties are presented.

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	12 Aug 2009 10:22
Last Modified:	19 Sep 2010 05:38
URI:	http://eprints.iisc.ernet.in/id/eprint/21760

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