Abstract
Infrared spectroscopy, powder X-ray diffraction, differential thermal analysis and nitrogen adsorption—desorption measurements were carried out on a series of solids prepared from 12-molybdophosphoric and 12-tungstophosphoric acids and the alkaline earth hydroxides. A single crystal investigation and data analysis were done for the Ba 2+ /PMo 12O 40 3− system. It is concluded that the reaction of simple divalent salts with 12-molybdophosphoric acid produces a mixture of the parent acid and a divalent compound rather than a divalent heteropoly salt.
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