Abstract
Dynamic and controlled rate thermal analysis (CRTA) has been used to characterise alunites of formula (M(Al)3(SO4)2(OH)6) where M ? is the cations K ? ,N a ? or NH4 ? . Thermal decomposition occurs in a series of steps: (a) dehydration, (b) well-defined dehydroxylation and (c) desulphation. CRTA offers a better resolution and a more detailed interpretation of water formation processes via approaching equilibrium conditions of decomposition through the elimination of the slow transfer of heat to the sample as a controlling parameter on the process of decomposition. Constant-rate decomposition processes of water formation reveal the subtle nature of dehydration and dehydroxylation.
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