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High-temperature thermodynamic properties of Y-doped barium zirconates, BaZr1–xYxO3−x/2 (x = 0.1, 0.2), with perovskite-type structure.

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Title: High-temperature thermodynamic properties of Y-doped barium zirconates, BaZr1–xYxO3−x/2 (x = 0.1, 0.2), with perovskite-type structure.
Authors: Tsvetkov, Dmitry S.1 (AUTHOR) Dmitry.Tsvetkov@urfu.ru, Malyshkin, Dmitry A.1 (AUTHOR), Sereda, Vladimir V.1 (AUTHOR), Ivanov, Ivan L.1 (AUTHOR), Tsvetkova, Nadezhda S.1 (AUTHOR), Zuev, Andrey Yu.1 (AUTHOR)
Source: Physics & Chemistry of Minerals. Mar2025, Vol. 52 Issue 1, p1-8. 8p.
Subjects: Thermodynamics, Solid oxide fuel cells, Heat capacity, Thermal expansion, Barium zirconate, Thermodynamic functions
Abstract: Perovskite-type oxides BaZr1–xYxO3−x/2 (x = 0.1, 0.2) were synthesized and their enthalpy increments were measured by means of high-temperature drop calorimetry in the temperature range of (373–1273) K in air. The data obtained were used for estimating the high-temperature thermodynamic functions (constant pressure heat capacity and entropy increments) of the zirconates BaZr1–xYxO3−x/2 (x = 0.1, 0.2). They were found to be only weakly dependent on the concentration of Y-dopant. Thermal expansion coefficient of zirconates BaZr1–xYxO3−x/2 (x = 0.1, 0.2) was successfully estimated by Grüneisen equation. Also, Neumann-Kopp rule was shown to be inapplicable for accurate estimation of heat capacities of the studied oxides. Thermodynamic analysis showed that BaZr1–xYxO3−x/2 (x = 0.1, 0.2) oxides are prone to chemical interaction with CO2 at typical working temperatures of proton-conducting solid oxide fuel cells. Some possibilities to overcome this issue have been discussed. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Perovskite-type oxides BaZr1–xYxO3−x/2 (x = 0.1, 0.2) were synthesized and their enthalpy increments were measured by means of high-temperature drop calorimetry in the temperature range of (373–1273) K in air. The data obtained were used for estimating the high-temperature thermodynamic functions (constant pressure heat capacity and entropy increments) of the zirconates BaZr1–xYxO3−x/2 (x = 0.1, 0.2). They were found to be only weakly dependent on the concentration of Y-dopant. Thermal expansion coefficient of zirconates BaZr1–xYxO3−x/2 (x = 0.1, 0.2) was successfully estimated by Grüneisen equation. Also, Neumann-Kopp rule was shown to be inapplicable for accurate estimation of heat capacities of the studied oxides. Thermodynamic analysis showed that BaZr1–xYxO3−x/2 (x = 0.1, 0.2) oxides are prone to chemical interaction with CO2 at typical working temperatures of proton-conducting solid oxide fuel cells. Some possibilities to overcome this issue have been discussed. [ABSTRACT FROM AUTHOR]
ISSN:03421791
DOI:10.1007/s00269-024-01304-6