The molecular metal oxide cluster compound [Al(H2O)6]PW12O40.4H2O reversibly dehydrates at 375 °C. Upon heating to ≥550 °C, irreversible conversion to AlPO4 and cubic W03(a = 7.521 (5) A) occurs in a solid-state process likened to polymerization. The reaction has been studied by thermogravimetric analysis, differential scanning calorimetry, X-ray and electron diffraction as well as 27A1 and 31P solid-state NMR. It is proposed as a model for synthesis of ceramics by sol-gel methods.
ASJC Scopus subject areas
- Colloid and Surface Chemistry