High-temperature mass spectrometry is used to investigate vaporization processes and determine SiO 2 activity in the Al 2 O 3 -SiO 2 system between 1850 and 1970 K. The results are consistent with the known phase equilibria in this system.
The phase equilibria in the Cs 2 O-B 2 O 3 -SiO 2 system are investigated in the temperature range 873-1073 K by the annealing-quenching technique, high-temperature microscopy, and X-ray powder diffraction analysis. The vapor composition, the activities of the components, and the Gibbs energies of glasses and melts in the Cs 2 O-B 2 O 3 -SiO 2 system are determined at a temperature of 1020 K. It is demonstrated that glasses and melts in the Cs 2 O · B 2 O 3 -Cs 2 O · SiO 2 system are characterized by positive deviations of the CsBO 2 activities and negative deviations of the Cs 2 O · SiO 2 activities from ideal behavior. As a consequence, the deviations of the Gibbs energies from ideal behavior change their sign.
Reactions of the gas-phase synthesis of tin vanadates, borates, and molybdates were studied. Standard enthalpies of formation and atomization of gaseous salts SnV 2 O 6 , SnB 2 O 4 , Sn 2 B 2 O 5 , SnMoO 4 , Sn 2 MoO 5 , and SnMo 2 O 7 were determined.
The vapor composition, activities of the components, and Gibbs energies of melts in the Cs 2 O-B 2 O 3 system at a temperature of 1020 K are determined by the Knudsen effusion mass spectrometric method. The activities of the components and the Gibbs energies of melts in the Cs 2 O-B 2 O 3 system at a temperature of 1020 are calculated in the framework of the approach based on the generalized lattice theory of associated solutions with the use of the melt model including vacancies. It is demonstrated that the calculated and experimental thermodynamic properties are in reasonable agreement.
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