Majumdar, A and Ganguli, Dibyendu (1991) Solid state synthesis of willemite, Zn2SiO4: role of precursors. Transactions of the Indian Ceramic Society, 50 (4). pp. 93-97. ISSN 0371-750X

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Abstract

Three precursors of equivalent oxide composition 2ZnO.SiO2, namely, (i) a colloidal gel prepared from zinc nitrate tetra+hexahydrate (partially crystallized) and a colloidal silica sol, (ii) a colloidal gel (amorphous) prepared from zinc chloride n-hydrate and the same colloidal silica sol, and (iii) a mechanical mixture of quartz and ZnO, have been used for examining their relative reactivities in the formation of willemite, Zn2SiO4. The samples were heat-treated at temperatures in the range 1000°C–1400°C and for soaking periods of less than 1 hr to 80 hours. X-ray analyses showed the nitrate-derived gel to be the most reactive, followed by the chloride-derived gel; the crystalline oxide mixture showed sluggish reaction. Attempts have been made to explain this difference in reactivity in terms of the thermal behaviour of the precursors below 1000°C.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Sol Gel
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Mar 2015 10:42
Last Modified:	05 Mar 2016 14:08
URI:	http://cgcri.csircentral.net/id/eprint/2751

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