EDTA assisted sol-gel synthesis of ZrW(2)O(8)

作者：De Buysser K^*; Van Driessche I; Schaubroeck J; Hoste S

来源：Journal of Sol-Gel Science and Technology, 2008, 46(2): 133-136.

DOI：10.1007/s10971-008-1728-x

• ZrW(2)O(8)
• EDTA
• negative thermal expansion
• sol-gel process

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, ZrW(2)O(8). 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 degrees C and reactive sintering at 1,180 degrees C. The decomposition of the gel is monitored with infrared spectroscopy and TGA. The high-temperature heat treatment results in ZrW(2)O(8) with its characteristic negative thermal expansion behaviour alpha([75-130 degrees C]): -9.8 +/- 1.6 mu m/m degrees C and alpha([175-300 degrees C]): -1.2 +/- 0.2 mu m/m degrees C.

• 出版日期2008-5