Heat Capacities of Natural Antlerite and Brochantite at Low Temperature

The investigation of a magnetic component of the heat capacity of natural samples of copper sulfates antlerite Cu3SO4(OH)4 in the temperature range below 40 K and brochantite Cu4SO4(OH)6 below 55 K has been carried out. A regular component of the heat capacity has been calculated from experimental d...

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Bibliographic Details
Published in:Journal of chemical and engineering data 2013-11, Vol.58 (11), p.2904-2912
Main Authors: Bissengaliyeva, Mira R, Bekturganov, Nuraly S, Gogol, Daniil B, Taimassova, Shynar T, Koketai, Temirgaly A, Bespyatov, Michael A
Format: Article
Language:English
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Summary:The investigation of a magnetic component of the heat capacity of natural samples of copper sulfates antlerite Cu3SO4(OH)4 in the temperature range below 40 K and brochantite Cu4SO4(OH)6 below 55 K has been carried out. A regular component of the heat capacity has been calculated from experimental data of adiabatic calorimetry. In the low-temperature area of (0 to 55) K two peaks of magnetic heat capacity for brochantite have been registered. The contributions of anomalous component ΔS tr into entropy of the minerals are (11 ± 3) J·mol–1·K–1 for antlerite and (5.3 ± 1.5) J·mol–1·K–1 for brochantite.
ISSN:0021-9568
1520-5134
DOI:10.1021/je400130b