Thermoanalytical studies of natural potassium, sodium and ammonium alunites
Frost, Ray L., Kristof, Janos, Palmer, Sara J., Horvath, Erzsebet, & Jakub, Emma (2010) Thermoanalytical studies of natural potassium, sodium and ammonium alunites. Journal of Thermal Analysis and Calorimetry, 100(3), pp. 961-966.
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+, Na+ 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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