Abstract
Y2W3O12 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 Y2W3O12 show large thermal expansion hysteresis due to large grain size and a large initial positive thermal expansion due to the removal of water molecules. Al2O3 has been added to Y2W3O12 upto 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.
Similar content being viewed by others
References
Evans J S O, Mary T A and Sleight A W 1997J. Solid State Chem. 133 580
Evans J S O, Mary T A and Sleight A W 1998J. Solid State Chem. 137 148
Evans J S O and Mary T A 2000Int. J. Inorg. Mater. 2 143
Forster P M and Sleight A W 1999Int. J. Inorg. Mater. 1 123
Forster P M, Yokochi A and Sleight A W 1998J. Solid State Chem. 140 157
Mary T A and Sleight A W 1999J. Mater. Res. 14 912
Nassau K, Levinstein H J and Loiacono G M 1965J. Phys. Chem. Solids 26 1805
Sumithra S and Umarji A M 2003Mater. Res. Bull. (communicated)
Author information
Authors and Affiliations
Corresponding author
Additional information
Dedicated to Professor C N R Rao on his 70th birthday
Rights and permissions
About this article
Cite this article
Sumithra, S., Umarji, A.M. Dilatometric studies of Y2W3O12 with added Al2O3 . J Chem Sci 115, 695–701 (2003). https://doi.org/10.1007/BF02708259
Issue Date:
DOI: https://doi.org/10.1007/BF02708259