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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De Buysser, K., Van Driessche, I., Schaubroeck, J. et al. EDTA assisted sol–gel synthesis of ZrW2O8 . J Sol-Gel Sci Technol 46, 133–136 (2008). https://doi.org/10.1007/s10971-008-1728-x
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DOI: https://doi.org/10.1007/s10971-008-1728-x