TY - JOUR

T1 - High‐temperature Mass Spectrometric Study and Modeling of the Thermodynamic Properties of the TiO2‐SiO2‐ZrO2 System

AU - Shilov, Andrey L.

AU - Stolyarova, Valentina L.

AU - Lopatin, Sergey I.

AU - Vorozhtcov, Viktor A.

AU - Kirillova, Svetlana A.

N1 - Shilov A.L., Stolyarova V.L., Lopatin S.I., Vorozhtcov V.A., Kirillova S.A. High‐temperature mass spectrometric study and modeling of the thermodynamic properties of the TiO2‐SiO2‐ZrO2 system. // ChemistrySelect. 2023. V. 9. N 3. P. e202302782. doi: 10.1002/slct.202302782

PY - 2024/1/16

Y1 - 2024/1/16

N2 - Development of the advanced materials based on the TiO2-SiO2-ZrO2 system is hindered by lack of the information on its thermodynamic properties and phase equilibria. In the present study, the samples in the TiO2-SiO2-ZrO2 system were prepared by solid-state synthesis and analyzed by X-ray microanalysis, fluorescence, and diffraction techniques. The thermodynamic properties in this system were evaluated by Knudsen effusion mass spectrometric (KEMS) method and optimized within the generalized lattice theory of associated solutions (GLTAS). The main vapor species over the silica-containing samples vaporized from the tungsten cell at the temperature 1973 K were SiO, O, WO2, and WO3. The vapor over the samples in the TiO2-ZrO2 system at 2356 K was composed mainly of TiO, TiO2, O, WO2, and WO3. The activity of components in the samples and the partial pressures of the identified vapor species were determined. At 1973 K, the TiO2-SiO2-ZrO2 system is characterized by positive deviations from the ideality. The observed weak dependence of the SiO2 activity on the SiO2 content suggests the presence of a broad field of immiscibility on the phase diagram in the concentration range 40–100 mol. % SiO2. The thermodynamic data on the TiO2-SiO2-ZrO2 system obtained by KEMS can be of great value for calculation of the phase equilibria.

AB - Development of the advanced materials based on the TiO2-SiO2-ZrO2 system is hindered by lack of the information on its thermodynamic properties and phase equilibria. In the present study, the samples in the TiO2-SiO2-ZrO2 system were prepared by solid-state synthesis and analyzed by X-ray microanalysis, fluorescence, and diffraction techniques. The thermodynamic properties in this system were evaluated by Knudsen effusion mass spectrometric (KEMS) method and optimized within the generalized lattice theory of associated solutions (GLTAS). The main vapor species over the silica-containing samples vaporized from the tungsten cell at the temperature 1973 K were SiO, O, WO2, and WO3. The vapor over the samples in the TiO2-ZrO2 system at 2356 K was composed mainly of TiO, TiO2, O, WO2, and WO3. The activity of components in the samples and the partial pressures of the identified vapor species were determined. At 1973 K, the TiO2-SiO2-ZrO2 system is characterized by positive deviations from the ideality. The observed weak dependence of the SiO2 activity on the SiO2 content suggests the presence of a broad field of immiscibility on the phase diagram in the concentration range 40–100 mol. % SiO2. The thermodynamic data on the TiO2-SiO2-ZrO2 system obtained by KEMS can be of great value for calculation of the phase equilibria.

KW - High-temperature chemistry

KW - Mass spectrometry

KW - Materials science

KW - Phase transitions

KW - Thermodynamics

KW - High-temperature chemistry

KW - Mass spectrometry

KW - Materials science

KW - Phase transitions

KW - Thermodynamics

UR - https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/slct.202302782

UR - https://www.mendeley.com/catalogue/a0c24818-221c-3c40-9412-8461c2092b0c/

U2 - 10.1002/slct.202302782

DO - 10.1002/slct.202302782

M3 - Article

VL - 9

JO - ChemistrySelect

JF - ChemistrySelect

SN - 2365-6549

IS - 3

M1 - e202302782

ER -