Abstract
The thermal decomposition of ammonium paratungstate (NH 4) 10(H 2W 12O 42) · 7H 2O to the onset of formation of WO 3 was studied using thermogravimetric and differential thermal analyses. Intermediate solid products were obtained by calcination at 155–500 ° C and subsequently analyzed using infrared spectroscopy and X-ray diffractometry. The gaseous products were identified by infrared spectroscopy. The results obtained together with molecular stoichiometry calculations, based on weight losses determined thermogravimetrically, could help in proposing a scheme for the course of decomposition.
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