Abstract
Tetrahydrated manganese sulphate crystals have been grown by slow evaporation of an aqueous solution maintained at 40±1°C. The thermal dehydration of this crystal has been studied by dynamic and isothermal TG measurements. It is observed from dynamic TG that the tetrahydrated Mn sulphate dehydrates in two steps releasing two molecules each at mean temperatures of 172 and 340°C. Isothermal TG measurements, dependent upon temperature, show different dehydration patterns with respect to time. From isothermal and dynamic TG measurements, the kinetic parameters E and Z have been calculated. It is observed that the general mechanism of dehydration in this crystal for both steps is random nucleation and growth. The proper form of the F(α) function which describes this mechanism is different in isothermal and dynamic studies.
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