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  • 1 Laboratoire de Chimie Appliquée et de Génie Chimique et Laboratoire de Chimie Physique Université Claude Bernard Lyon I 69 Villeurbanne France
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The thermal evolution of a very fine-grained hydrated cobalt molybdate, CoMoO4 · · 0.9H2O, has been studied by dilatometry, DTA, X-ray crystallography and scanning electron microscopy. Four principal stages have been detected between 25 and 1000°: dehydration, polymorphism (or precipitation), recrystallization, and high-temperature phase change. Such phenomena also occurred with some other hydrated molybdates (Ni, Mn).

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