Abstract—
A thermochemical study of natural calcium and magnesium orthosilicate monticellite (Ca1.00Mg0.95\({\text{Fe}}_{{0.05}}^{{2 + }}\))[SiO4] from the Khabarovsk Territory, Russia, was carried out on a Tian–Calvet microcalorimeter. The enthalpy of formation from elements Δf\(H_{{{\text{el}}}}^{^\circ }\)(298.15 K) = –2238.4 ± 4.5 kJ/mol was determined by high-temperature melt solution calorimetry. The enthalpy and Gibbs energy of formation of monticellite of theoretical composition of CaMg[SiO4] are calculated: Δf\(H_{{{\text{el}}}}^{^\circ }\)(298.15 K) = –2248.4 ± 4.5 kJ/mol and Δf\(G_{{{\text{el}}}}^{^\circ }\)(298.15 K) = –2130.5 ± 4.5 kJ/mol.
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Ogorodova, L.P., Gritsenko, Y.D., Vigasina, M.F. et al. Thermodynamic Properties of Montecellite. Geochem. Int. 57, 1343–1348 (2019). https://doi.org/10.1134/S0016702919120085
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DOI: https://doi.org/10.1134/S0016702919120085