Dilatometric studies of $Y_2W_3O_{12}$ with added $Al_2O_3$

Sumithra, S and Umarji, AM (2003) Dilatometric studies of $Y_2W_3O_{12}$ with added $Al_2O_3$. In: Journal of Chemical Sciences, 115 (5-6). pp. 695-701.

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Abstract

$Y_2W_3O_{12}$ exhibits negative thermal expansion along the three crystallographic directions due to the transverse thermal vibrations perpendicular to the Y–O–W linkage. It is highly hygroscopic and forms a trihydrate structure at room temperature. Dilatometric studies of $Y_2W_3O_{12}$ show large thermal expansion hysteresis due to large grain size and a large initial positive thermal expansion due to the removal of water molecules. $Al_2O_3$ has been added to $Y_2W_3O_{12}$ up to 10 wt% in an attempt to overcome the hygroscopicity and reduce the particle size and thereby the thermal expansion hysteresis. Thermo gravimetric, dilatometric and electron microscopic studies are presented to support these observations.

Item Type:	Journal Article
Additional Information:	The Copyright belongs to Indian Academy of Sciences.
Keywords:	Corner shared structure;Negative thermal expansion;Dilatometric studies
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	09 Apr 2006
Last Modified:	19 Sep 2010 04:25
URI:	http://eprints.iisc.ernet.in/id/eprint/6220

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