Vapor Composition and Thermodynamic Characteristics of Gaseous Molecules of Alkaline Earth Metal Tungstates.

Autor: Kazenas, E. K., Andreeva, N. A., Astakhova, G. K., Volchenkova, V. A., Ovchinnikova, O. A., Penkina, T. N., Fomina, O. N.
Zdroj: Inorganic Materials: Applied Research; Jun2024, Vol. 15 Issue 3, p893-898, 6p
Abstrakt: Calculated and experimental mass spectra of gaseous tungstates of alkaline earth metals MgWO4(g), CaWO4(g), SrWO4(g), and BaWO4(g) in the temperature range from 1600 to 2000 K are presented. The partial vapor pressures are determined and equations are derived for the temperature dependences of the partial pressures of gaseous molecules of alkaline earth metal tungstates for liquids in the following form (P, atm): On the basis of experimental data on vapor pressure, the enthalpies of evaporation (), formation (), and atomization () of gaseous tungstates of alkaline earth metals are calculated, which, respectively, amount to (ΔH0, kJ/mol) 652, 890, and 2855 for MgWO4; 644, 974, and 2968 for CaWO4; 615, 1045, and 3056 for SrWO4; and 548, 1045, and 3095 for BaWO4. It is determined that the enthalpy of sublimation of alkaline earth metal tungstates decreases from magnesium to barium. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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