Abstract
A thermal and thermochemical study of natural aqueous hydroxyl-containing diorthosilicate, hemimorphite Zn4[Si2O7](OH)2 · H2O, was performed. The step character of its thermal decomposition was studied using FTIR spectroscopy. Melt solution calorimetry was used to determine the enthalpies of formation from oxides Δf H OXO (298.15 K) = −69.3 ± 9.9 kJ/mol and elements {ie1481-2} (298.15 K) = −3864.3 ± 10.2 kJ/mol.
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Original Russian Text © M.R. Bisengalieva, L.V. Mel’chakova, L.P. Ogorodova, M.F. Vigasina, 2010, published in Zhurnal Fizicheskoi Khimii, 2010, Vol. 84, No. 9, pp. 1627–1631.
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Bisengalieva, M.R., Mel’chakova, L.V., Ogorodova, L.P. et al. A thermal and thermochemical study of natural hemimorphite. Russ. J. Phys. Chem. 84, 1481–1484 (2010). https://doi.org/10.1134/S0036024410090050
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DOI: https://doi.org/10.1134/S0036024410090050