Abstract
A new polymorph of ZrW{sub 2}O{sub 8}, structurally related to trigonal ZrMo{sub 2}O{sub 8}, has ben prepared at low temperatures using nonhydrolytic sol-gel chemistry. Its identity was established by powder C-ray diffraction, energy dispersive X-ray analysis, and extended X-ray absorption fine structure (EXAFS). This material is denser than the previously reported cubic and orthorhombic forms of ZrW{sub 2}O{sub 8} and decomposes into the binary oxides on prolonged heating at 700 C. An EXAFS investigation of the crystallization of ZrW{sub 2}O{sub 8} gels, prepared by nonhydrolytic methods, suggests that the coordination environments of the cations in the heat-treated gels evolve toward those found in the new form of ZrW{sub 2}O{sub 8} prior to the crystallization of this product.
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