Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Heat Capacities of Natural Antlerite and Brochantite at Low Temperature

Bissengaliyeva, M. R.[Mira R.], Bekturganov, N. S.[Nuraly S.], Gogol, D. B.[Daniil B.], Taimassova, S. T.[Shynar T.], Koketai, T. A.[Temirgaly A.], Bespyatov, M. A.[Michael A.]
J. Chem. Eng. Data 2013, 58, 11, 2904-2912
ABSTRACT
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 ?Str 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.
Compounds
# Formula Name
1 Cu3H4O8S copper(II) tetrahydroxide sulfate
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • Molar heat capacity at constant pressure, J/K/mol ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • Small (less than 1 g) adiabatic calorimetry
  • 275
  • POMD
  • 1
  • Molar heat capacity at constant pressure, J/K/mol ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • Small (less than 1 g) adiabatic calorimetry
  • 50
  • POMD
  • 1
  • Molar entropy, J/K/mol ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • Small (less than 1 g) adiabatic calorimetry
  • 50
  • POMD
  • 1
  • Molar enthalpy function {Hm(T)-Hm(0)}/T, J/K/mol ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • Small (less than 1 g) adiabatic calorimetry
  • 50