Research output: Contribution to journal › Article
A calorimetric and thermodynamic investigation of the synthetic analogs of cobaltomenite, CoSeO3·2H2O, and ahlfeldite, NiSeO3·2H2O. / Charykova, M.V.; Krivovichev, V.G.; Lelet, M.I.; Yakovenko, O.S.; Suleimanov, E.V.; Depmeier, W.; Semenova, V.V.; Zorina, M.L.
In: American Mineralogist, Vol. 99, No. 4, 2014, p. 742-748.Research output: Contribution to journal › Article
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TY - JOUR
T1 - A calorimetric and thermodynamic investigation of the synthetic analogs of cobaltomenite, CoSeO3·2H2O, and ahlfeldite, NiSeO3·2H2O
AU - Charykova, M.V.
AU - Krivovichev, V.G.
AU - Lelet, M.I.
AU - Yakovenko, O.S.
AU - Suleimanov, E.V.
AU - Depmeier, W.
AU - Semenova, V.V.
AU - Zorina, M.L.
PY - 2014
Y1 - 2014
N2 - Thermophysical and thermochemical calorimetric investigations were carried out on synthetic analogs of two minerals: cobaltomenite (CoSeO 3·2H2O) and ahlfeldite (NiSeO3· 2H2O). The synthesis was realized by mixing of aqueous solutions of cobalt and nickel nitrates, accordingly, and sodium selenite, acidified with the help of a solution of nitric acid and characterized by X-ray powder diffraction and FTIR spectroscopy methods. The low-temperature heat capacities of CoSeO3·2H2O and NiSeO3·2H 2O were measured using adiabatic calorimetry between 8 and 340 K, and the third-law entropies were determined. Values of S° (298 K, CoSeO 3·2H2O, cr.) = 183.2 ± 1.0 J/(mol·K) and S° (298 K, NiSeO3·2H2O, cr.) = 172.9 ± 1.0 J/(mol·K) are obtained with an uncertainty of 0.5%. The enthalpies of formation for CoSeO3·2H2O and NiSeO3·2H2O were determined by solution calorimetry with H2SO4 solution as the solvent and giving ΔfH° (298 K, CoSeO3·2H2O, cr.) = -1135.3 kJ/mol, ΔfH° (298 K, NiSeO3· 2H2O, cr.) = -1133.3 kJ/mol. The Gibbs
AB - Thermophysical and thermochemical calorimetric investigations were carried out on synthetic analogs of two minerals: cobaltomenite (CoSeO 3·2H2O) and ahlfeldite (NiSeO3· 2H2O). The synthesis was realized by mixing of aqueous solutions of cobalt and nickel nitrates, accordingly, and sodium selenite, acidified with the help of a solution of nitric acid and characterized by X-ray powder diffraction and FTIR spectroscopy methods. The low-temperature heat capacities of CoSeO3·2H2O and NiSeO3·2H 2O were measured using adiabatic calorimetry between 8 and 340 K, and the third-law entropies were determined. Values of S° (298 K, CoSeO 3·2H2O, cr.) = 183.2 ± 1.0 J/(mol·K) and S° (298 K, NiSeO3·2H2O, cr.) = 172.9 ± 1.0 J/(mol·K) are obtained with an uncertainty of 0.5%. The enthalpies of formation for CoSeO3·2H2O and NiSeO3·2H2O were determined by solution calorimetry with H2SO4 solution as the solvent and giving ΔfH° (298 K, CoSeO3·2H2O, cr.) = -1135.3 kJ/mol, ΔfH° (298 K, NiSeO3· 2H2O, cr.) = -1133.3 kJ/mol. The Gibbs
U2 - 10.2138/am.2014.4588
DO - 10.2138/am.2014.4588
M3 - Article
VL - 99
SP - 742
EP - 748
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 4
ER -
ID: 7062764