High-temperature mass spectrometric study and modeling of thermodynamic properties in the La2O3-TiO2 system
The vapor composition over two samples of the La2O3-TiO2 system containing 50 and 90 mole % TiO2 was explored by the high-temperature Knudsen effusion mass spectrometric method. TiO2, TiO, and LaO species were identified in the vapor. From the measured partial pressures of the vapor species, the TiO...
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Elsevier
2025-06-01
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| Series: | Chemical Thermodynamics and Thermal Analysis |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667312625000045 |
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| author | Valentina L. Stolyarova Andrey L. Shilov Viktor A. Vorozhtcov Sergey I. Lopatin Anna V. Fedorova |
| author_facet | Valentina L. Stolyarova Andrey L. Shilov Viktor A. Vorozhtcov Sergey I. Lopatin Anna V. Fedorova |
| author_sort | Valentina L. Stolyarova |
| collection | DOAJ |
| description | The vapor composition over two samples of the La2O3-TiO2 system containing 50 and 90 mole % TiO2 was explored by the high-temperature Knudsen effusion mass spectrometric method. TiO2, TiO, and LaO species were identified in the vapor. From the measured partial pressures of the vapor species, the TiO2 activity as a function of composition was determined at the temperatures of 2290 K and 2475 K. As a result of modeling within the generalized lattice theory of associated solutions, the La2O3 activity was determined. The obtained component activities and the excess Gibbs energy indicate strong negative deviations from the ideal behavior, which are illustrated by the calculated concentration dependence of the relative number of mixed bonds in the system under study. |
| format | Article |
| id | doaj-art-9667a6506ca54aebb24be90c4c5e65f6 |
| institution | Kabale University |
| issn | 2667-3126 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Chemical Thermodynamics and Thermal Analysis |
| spelling | doaj-art-9667a6506ca54aebb24be90c4c5e65f62025-01-19T06:26:54ZengElsevierChemical Thermodynamics and Thermal Analysis2667-31262025-06-0118100164High-temperature mass spectrometric study and modeling of thermodynamic properties in the La2O3-TiO2 systemValentina L. Stolyarova0Andrey L. Shilov1Viktor A. Vorozhtcov2Sergey I. Lopatin3Anna V. Fedorova4Institute of Silicate Chemistry of Russian Academy of Sciences, Makarova Emb., 2, St. Petersburg 199034, Russia; Saint Petersburg State University, Universitetskaya Emb. 7/9, St. Petersburg 199034, Russia; Corresponding author at: Saint Petersburg State University, Universitetskaya nab., 7/9, St. Petersburg 199034, Russia.Institute of Silicate Chemistry of Russian Academy of Sciences, Makarova Emb., 2, St. Petersburg 199034, RussiaInstitute of Silicate Chemistry of Russian Academy of Sciences, Makarova Emb., 2, St. Petersburg 199034, RussiaInstitute of Silicate Chemistry of Russian Academy of Sciences, Makarova Emb., 2, St. Petersburg 199034, RussiaInstitute of Silicate Chemistry of Russian Academy of Sciences, Makarova Emb., 2, St. Petersburg 199034, Russia; Saint Petersburg State University, Universitetskaya Emb. 7/9, St. Petersburg 199034, RussiaThe vapor composition over two samples of the La2O3-TiO2 system containing 50 and 90 mole % TiO2 was explored by the high-temperature Knudsen effusion mass spectrometric method. TiO2, TiO, and LaO species were identified in the vapor. From the measured partial pressures of the vapor species, the TiO2 activity as a function of composition was determined at the temperatures of 2290 K and 2475 K. As a result of modeling within the generalized lattice theory of associated solutions, the La2O3 activity was determined. The obtained component activities and the excess Gibbs energy indicate strong negative deviations from the ideal behavior, which are illustrated by the calculated concentration dependence of the relative number of mixed bonds in the system under study.http://www.sciencedirect.com/science/article/pii/S2667312625000045La2O3-TiO2 systemKnudsen effusion mass spectrometryVaporizationModelingThermodynamics |
| spellingShingle | Valentina L. Stolyarova Andrey L. Shilov Viktor A. Vorozhtcov Sergey I. Lopatin Anna V. Fedorova High-temperature mass spectrometric study and modeling of thermodynamic properties in the La2O3-TiO2 system Chemical Thermodynamics and Thermal Analysis La2O3-TiO2 system Knudsen effusion mass spectrometry Vaporization Modeling Thermodynamics |
| title | High-temperature mass spectrometric study and modeling of thermodynamic properties in the La2O3-TiO2 system |
| title_full | High-temperature mass spectrometric study and modeling of thermodynamic properties in the La2O3-TiO2 system |
| title_fullStr | High-temperature mass spectrometric study and modeling of thermodynamic properties in the La2O3-TiO2 system |
| title_full_unstemmed | High-temperature mass spectrometric study and modeling of thermodynamic properties in the La2O3-TiO2 system |
| title_short | High-temperature mass spectrometric study and modeling of thermodynamic properties in the La2O3-TiO2 system |
| title_sort | high temperature mass spectrometric study and modeling of thermodynamic properties in the la2o3 tio2 system |
| topic | La2O3-TiO2 system Knudsen effusion mass spectrometry Vaporization Modeling Thermodynamics |
| url | http://www.sciencedirect.com/science/article/pii/S2667312625000045 |
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