Samarium zirconate: Thermodynamics and vaporization at high temperatures. (June 2021)

• Record Type: Journal Article
• Authors: Vorozhtcov, Viktor A.; Stolyarova, Valentina L.; Lopatin, Sergey I.; Shugurov, Sergey M.; Simonenko, Elizaveta P.; Simonenko, Nikolay P.
• Is Part Of: Materials today communications. Volume 27(2021)
• Publication Date: 2021-06
• Subjects: Ceramics -- Oxide materials -- Nuclear reactor materials -- Thermodynamic properties -- Rare earth alloys and compounds -- Chemical synthesis; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2021.102200
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: Highlights: The Sm2 Zr2 O7 powder was synthesized by the glycol-citrate method. Conditions for obtaining the pyrochlore phase were studied. The Sm2 Zr2 O7 vaporization was examined at temperatures 2299−2730 K. Thermodynamic properties in the Sm2 O3 -ZrO2 system were obtained at 2368 and 2460 К. Abstract: The purpose of the present research was to study vaporization processes and thermodynamic properties of samarium zirconate with the pyrochlore structure. The Sm2 Zr2 O7 sample was synthesized by the glycol-citrate method with the confirmation of its pyrochlore structure using X-ray phase analysis, infrared spectroscopy, and scanning electron microscopy. The thermodynamic properties and vaporization processes of samarium zirconate were examined by the high temperature mass spectrometric method at temperatures 2299−2730 K. The data obtained in the present study for the first time allowed determination of the Gibbs energy of formation of samarium zirconate from the pure oxides at 2460 K, which was equal to -115.7 kJ/mol, and, as a consequence, the values of the Gibbs energy and enthalpy of formation from the pure oxides at the temperature 298.15 K, which were equal to -130.5 kJ/mol and -131.4 kJ/mol, respectively.