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Journal of Sol-Gel Science and Technology

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01-05-2008 | Original Paper

EDTA assisted sol–gel synthesis of ZrW₂O₈

Authors: K. De Buysser, I. Van Driessche, J. Schaubroeck, S. Hoste

Published in: Journal of Sol-Gel Science and Technology | Issue 2/2008

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Abstract

A novel sol–gel synthetic route using water-soluble precursor salts is presented as a synthetic path for a high-purity negative thermal expansion material, ZrW₂O₈. This synthetic route involves a sol–gel method with the use of EDTA as complexing agent. The aqueous solution is transformed into a ceramic material after a two-step heat treatment: gelation at 60 °C and reactive sintering at 1,180 °C. The decomposition of the gel is monitored with infrared spectroscopy and TGA. The high-temperature heat treatment results in ZrW₂O₈ with its characteristic negative thermal expansion behaviour α_{[75–130 °C]}: −9.8 ± 1.6 μm/m °C and α_{[175–300 °C]}: −1.2 ± 0.2 μm/m °C.

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Title: EDTA assisted sol–gel synthesis of ZrW2O8
Authors: K. De Buysser
I. Van Driessche
J. Schaubroeck
S. Hoste
Publication date: 01-05-2008
Publisher: Springer US
Published in: Journal of Sol-Gel Science and Technology / Issue 2/2008
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-008-1728-x

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Acknowledgements to the scientists who acted as referees for manuscripts submitted to the Journal of Science and Technology in 2007

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