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  • 1 Department of Chemistry, Faculty of Science Banaras Hindu University 221 005 Varanasi India
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Thermal characteristics of the molybdates of magnesium (MgMoO4 · 2H2O), manganese (MnMoO4 · 1.5H2O) and silver (Ag2MoO4) have been studied by DTA and TG techniques. The thermal curves of MgMoO4 · 2H2O show two endothermic changes at 195° and 390° followed by an exothermic change at 420°C. The endothermic changes represent the stepwise dehydration of MgMoO4 · 2H2O to MgMoO4 · H2O and from MgMoO4 · H2O to MgMoO4. X-ray diffraction and IR studies, however, reveal that magnesium molybdate does not undergo any type of decomposition up to 900° and the exo-peak at 420° is clearly due to crystallization.