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Thermoanalytical studies of silver and lead jarosites and their solid solutions

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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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Authors and Affiliations

  1. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, QLD, 4001, Australia

    Ray L. Frost & Sara J. Palmer

  2. Department of Analytical Chemistry, University of Pannonia, PO Box 158, 8201, Veszprém, Hungary

    János Kristóf

  3. Department of Environmental Engineering and Chemical Technology, University of Pannonia, PO Box 158, 8201, Veszprém, Hungary

    Erzsébet Horváth

Authors
  1. Ray L. Frost
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  2. Sara J. Palmer
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  3. János Kristóf
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  4. Erzsébet Horváth
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Correspondence to Ray L. Frost.

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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

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