High-Temperature Thermodynamic Properties of Hafnium and Rare Earth Oxide Ceramics

V. A. Vorozhtcov; Ворожцов В. А.; V. L. Stolyarova; Столярова В. Л.; S. A. Kirillova; Кириллова С. А.; S. I. Lopatin; Лопатин С. И.

doi:10.31857/S0044457X22601055

High-Temperature Thermodynamic Properties of Hafnium and Rare Earth Oxide Ceramics

Authors: Vorozhtcov V.A.¹^,2, Stolyarova V.L.¹, Kirillova S.A.²^,3, Lopatin S.I.¹^,2
Affiliations:
1. St. Petersburg State University
2. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences
3. St. Petersburg State Electrotechnical University “LETI”
Issue: Vol 68, No 2 (2023)
Pages: 209-220
Section: ФИЗИКО-ХИМИЧЕСКИЙ АНАЛИЗ НЕОРГАНИЧЕСКИХ СИСТЕМ
URL: https://rjsvd.com/0044-457X/article/view/665305
DOI: https://doi.org/10.31857/S0044457X22601055
EDN: https://elibrary.ru/LOJKSH
ID: 665305

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Abstract

Previous experimental data on the vaporization and high-temperature thermodynamic properties of hafnium and rare earth oxide ceramics are considered here. The La2O3–Sm2O3 system is for the first time studied at 2323 K using Knudsen effusion mass spectrometry. As a result of this study, the vapor composition over ceramic samples under investigation is identified, and concentration dependences of the partial pressures of vapor species over the system under study and condensed-phase thermodynamic properties are determined, namely, the component activities and the excess Gibbs energy. The enthalpy of formation from oxides and excess entropy of the La2O3–Sm2O3 system at 2323 K are determined using the Wilson polynomial. The Kohler, Redlich–Kister, and Wilson semiempirical methods were used to calculate the thermodynamic properties in the La2O3–Sm2O3–Y2O3–HfO2 and La2O3–Sm2O3–ZrO2–HfO2 quaternary systems at 2330 K using the equilibrium data gained in the relevant binary systems. The results of the calculations were compared to previous semiempirical estimates of the respective quantities for the La2O3–Y2O3–ZrO2–HfO2 and Sm2O3–Y2O3–ZrO2–HfO2 systems taken as examples. Calculations by the Wilson method are shown to provide the best match with the experimentally obtained lanthanoid oxide activities in the La2O3–Sm2O3–Y2O3–HfO2 and La2O3–Sm2O3–ZrO2–HfO2 systems.

Keywords

vaporization, thermodynamic properties, lanthanum oxide, samarium oxide, high-temperature, mass spectrometry

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