Evaluation of the thermodynamic stability of REMgAl11O19 (RE = La, Pr, Nd, Sm) hexaaluminates with a magnetoplumbite structure in the high temperature region

Konstantin S. Gavrichev; Vladimir N Guskov; Pavel G. Gagarin; Anton V. Guskov

doi:10.17308/kcmf.2024.26/12453

Konstantin S. Gavrichev Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr., Moscow 119991, Russian Federation https://orcid.org/0000-0001-5304-3555
Vladimir N Guskov Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr., Moscow 119991, Russian Federation https://orcid.org/0000-0003-0425-8618
Pavel G. Gagarin Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr., Moscow 119991, Russian Federation https://orcid.org/0000-0001-6450-3959
Anton V. Guskov Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr., Moscow 119991, Russian Federation https://orcid.org/0000-0003-0826-5495

DOI: https://doi.org/10.17308/kcmf.2024.26/12453

Keywords: Hexaaluminates, Magnetoplumbite, RE, Thermodynamics, Thermal barrier coatings

Abstract

This study is important due to the lack of reliable data about the properties of high temperature materials for energy production and aerospace engineering. The purpose of this article was to evaluate the thermodynamic stability of RE magnesium hexaaluminates REMgAl₁₁O₁₉ (RE = La, Pr, Nd, Sm) with a magnetoplumbite structure, which are promising components for thermal barrier coatings. For this, we calculated the values of the Gibbs energy of the decomposition reactions of RE magnesium hexaaluminates into simple oxides and aluminum-magnesium spinel MgAl₂O₄ and REAlO₃ phases in the temperature range of 298–1,800 K. For calculations, we used data on the thermodynamic properties of hexaaluminates calculated from the values of heat capacity measured by differential scanning calorimetry in the range of 300-1,800 K and from values of thermodynamic properties of simple oxides, MgAl₂O₄, and REAlO₃ provided in previous research. There is hardly any information about the thermodynamic properties of RE magnesium hexaaluminates, which are promising thermal barrier materials. The purpose of the article is to provide a thermodynamic evaluation of the probability of decomposition reactions of hexaaluminates in the high temperature region.

Previously published data on the high temperature heat capacity of compounds with the composition of REMgAl₁₁O₁₉ (RE = La, Pr, Nd, Sm) were used to calculate temperature dependences of entropy and changes in enthalpy, which were used to evaluate the Gibbs energy of the decomposition reactions of hexaaluminates into constituent oxides.

The temperature dependences of the Gibbs energy of the four possible decomposition reactions of hexaaluminates allowed drawing conclusions about thermodynamic stability in the high temperature region

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Author Biographies

Konstantin S. Gavrichev, Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr., Moscow 119991, Russian Federation

Dr. Sci. (Chem.), Chief Researcher, Head of Laboratory of Thermal Analysis and Calorimetry, Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences (Moscow, Russian Federation)

Vladimir N Guskov, Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr., Moscow 119991, Russian Federation

Dr. Sci. (Chem.), Leading Researcher of Laboratory of Thermal Analysis and Calorimetry, Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences (Moscow, Russian Federation)

Pavel G. Gagarin, Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr., Moscow 119991, Russian Federation

Cand. Sci. (Chem.), Senior Researcher of Laboratory of Thermal Analysis and Calorimetry, Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences (Moscow, Russian Federation)

Anton V. Guskov, Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr., Moscow 119991, Russian Federation

Cand. Sci. (Chem.), Researcher of Laboratory of Thermal Analysis and Calorimetry, Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences (Moscow, Russian Federation)

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