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• W2792697968 abstract "Rationale Materials based on the La 2 O 3 ‐Y 2 O 3 ‐HfO 2 system are promising for the production of highly refractory ceramics, e.g., thermal barrier coatings and molds for casting of elements of gas turbine engines. When these ceramics are synthesized or used at high temperatures, selective vaporization of components may take place, resulting in changes in the physicochemical properties of the materials. Consequently, development of materials based on the La 2 O 3 ‐Y 2 O 3 ‐HfO 2 system requires information on vaporization in this system as well as on its thermodynamics, without which prediction and modeling of their physicochemical properties are impossible. Methods Vaporization processes and thermodynamic properties in the La 2 O 3 ‐Y 2 O 3 ‐HfO 2 system were studied by the high‐temperature Knudsen effusion mass spectrometric method using a MS‐1301 mass spectrometer. Electron ionization of vapor species was employed at an ionization energy of 25 eV. The samples under study and reference substances were vaporized from a tungsten twin effusion cell. Results At 2337 K the main vapor species over samples in the La 2 O 3 ‐Y 2 O 3 ‐HfO 2 system were shown to be LaO, YO and O. The partial pressures of the vapor species mentioned and the La 2 O 3 and Y 2 O 3 activities in the samples were obtained at 2337 K. The Gibbs energies of mixing and excess Gibbs energies were found in the solid solution of this system. Conclusions Vaporization of ceramics based on the La 2 O 3 ‐Y 2 O 3 ‐HfO 2 system at 2337 K led to selective transition of La 2 O 3 and Y 2 O 3 to the gaseous phase, with the La 2 O 3 vaporization rate being higher than that of Y 2 O 3 . The directions of composition changes of samples due to their vaporization at 2337 K were determined. In the solid solution of this system negative deviations from ideal behavior were found. The ability to estimate the excess Gibbs energies in the solid solution of the La 2 O 3 ‐Y 2 O 3 ‐HfO 2 system by the Kohler method was shown." @default.
• W2792697968 created "2018-03-29" @default.
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• W2792697968 date "2018-04-06" @default.
• W2792697968 modified "2023-09-23" @default.
• W2792697968 title "Vaporization and thermodynamics of ceramics based on the La₂ O₃ -Y₂ O₃ -HfO₂ system studied by the high-temperature mass spectrometric method" @default.
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• W2792697968 doi "https://doi.org/10.1002/rcm.8081" @default.
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