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Temperature- and water-induced structural transformations in Pr- and Ho-doped Ba(Ce0.7Zr0.1Y0.1Yb0.1)O3-δ proton conducting electrolyte

Ivan Ivanov, Dmitry Tsvetkov, Vladimir Sereda, Dmitry Malyshkin, Anna Sereda, Petr Zakiryanov, Roman Yagovitin, Andrey Zuev

Abstract


The crystal structure of the doped Ba(Ce0.7Zr0.1Y0.1Yb0.05M0.05)O3–δ (M =Pr and Ho) cerates was studied at various temperatures in dry and wet atmosphere using in situ high-temperature X-ray powder diffraction. A phase transition from tetragonal I4/mcm to cubic Pm-3m structure was shown to occur in all the cerates studied upon heating from 25 up to 1000 °C irrespective of air humidity. The cubic Pm-3m and tetragonal I4/mcm phases possess comparable coefficients of linear thermal expansion (CTEs), around 11·10–6 K–1. Even in very dry atmosphere (log pH2O / atm) = –4.0), chemical expansion caused by hydration was shown to contribute significantly to the observed structural transformations and temperature dependence of the unit cell volume of the doped cerates.

Keywords


proton-conducting electrolyte; phase transition; hydration thermodynamics; thermochemical expansion

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References


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DOI: https://doi.org/10.15826/chimtech.9412

Copyright (c) 2025 Ivan Ivanov, Dmitry Tsvetkov, Vladimir Sereda, Dmitry Malyshkin, Anna Sereda, Petr Zakiryanov, Roman Yagovitin, Andrey Zuev

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Chimica Techno Acta, 2014–2025
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