Abstract
Dynamic and controlled rate thermal analysis has been used to characterise synthesised jarosites of formula [M(Fe)3(SO4)2(OH)6] where M is Pb, Ag or Pb–Ag mixtures. 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. CRTA offers a better resolution and a more detailed interpretation of the decomposition 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 non-isothermal nature reveal separation of the dehydroxylation steps, since in these cases a higher energy (higher temperature) is needed to drive out gaseous decomposition products through a decreasing space at a constant, pre-set rate.
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Acknowledgements
This research was supported by the Hungarian Scientific Research Fund (OTKA) under grant No. K62175. The financial and infra-structure support of the Queensland University of Technology Inorganic Materials Research Program is gratefully acknowledged.
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Frost, R.L., Palmer, S.J., Kristóf, J. et al. Thermoanalytical studies of silver and lead jarosites and their solid solutions. J Therm Anal Calorim 101, 73–79 (2010). https://doi.org/10.1007/s10973-009-0406-8
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DOI: https://doi.org/10.1007/s10973-009-0406-8