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Elsevier, Geochimica et Cosmochimica Acta, 22(73), p. 6805-6815

DOI: 10.1016/j.gca.2009.08.005

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Internally consistent thermodynamic data for magnesium sulfate hydrates

Journal article published in 2009 by Klaus-Dieter Grevel, Juraj Majzlan
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Experimental studies on the stability of several Mg-sulfate hydrates including epsomite (MgSO4·7H2O), hexahydrite (MgSO4·6H2O), starkeyite (MgSO4·4H2O), and kieserite (MgSO4·H2O) as a function of temperature and relative humidity are in poor agreement with calculations based on thermodynamic properties of these substances taken from the literature. Therefore, we synthesized four different MgSO4 hydrates and measured their enthalpies of formation by solution calorimetry at T = 298.15 K. The resulting enthalpies of formation from the elements are: