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The stability of the ammonium phospho-molybdic Dawson-type salt (NH4)6P2Mo18O62·12H2O in aqueous solution has been studied. The polyanion P2Mo18O626− decomposes into the lacunar Keggin-type anion HxPMo11O39(7 − x)−, HxMo5P2O23(6 − x)−, phosphate and oxomolybdate species, regardless of the concentration and acid–base conditions.
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Briand et al. (2002) studied this question.
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