SÉVIN, Louise; RAZAFINDRAMANANA, Volatiana; JULIAN-JANKOWIAK, Aurélie; JUSTIN, Jean-François; MAUVY, Fabrice; REBILLAT, Francis

doi:10.1016/j.jeurceramsoc.2020.05.044

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SÉVIN, Louise
DMAS, ONERA, Université Paris Saclay [Châtillon]
Centre National d'Études Spatiales [Toulouse] [CNES]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

RAZAFINDRAMANANA, Volatiana
DMAS, ONERA, Université Paris Saclay [Châtillon]
Centre National d'Études Spatiales [Toulouse] [CNES]

JULIAN-JANKOWIAK, Aurélie
DMAS, ONERA, Université Paris Saclay [Châtillon]

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Journal of the European Ceramic Society. 2020, vol. 40, n° 15, p. 5859-5869

Elsevier

Résumé en anglais

The needs for space propulsion thruster induce the development of new designs and material compositions able to withstand 3000 K of flame combustion temperature. Cubic-stabilised hafnia appears as one of the most promising candidates to protect refractory materials in such conditions. Here, the influence of dopant content on the thermal expansion (473-1823 K) and ionic conductivity (600-1150 K) in highly doped-hafnia (12-33 mol% Y2O3) with disordered cubic systems is reported. The composition and the homogeneity of the samples were carefully checked using crystallographic, chemical and spectroscopy analyses. Finally, the study of thermal and oxygen conductivity properties highlighted their dependence on the amount of dopant. The average thermal expansion coefficient was lowered from 11.3 to 10.9 .10-6 /K and the ionic conductivity decreased by two decades with 33 mol. % of Y2O3 by using the optimised substitution ratio. Interactions and local ordering of oxygen vacancies can explain this behaviour.< Réduire

Mots clés en anglais

Yttria doped hafnia

Fluorite

Thermal Expansion Coefficient (TEC)

Ionic conductivity

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Effect of high-content Yttria on the thermal expansion behaviour and ionic conductivity of a stabilised cubic Hafnia

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