Heat Capacities of Natural Antlerite and Brochantite at Low Temperature

Мira R. Bissengaliyeva, Бектурганов Нуралы Султанович, Daniil B. Gogol, Shynar T. Taimassova, T.A. Koketai, Michael A. Bespyatov

2013

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DOI 10.1021/je400130b

Data confidence 70 medium

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Abstract

The investigation of a magnetic component of the heat capacity of natural samples of copper sulfates antlerite Cu 3 SO 4 (OH) 4 in the temperature range below 40 K and brochantite Cu 4 SO 4 (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 Δ S 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.