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- W3027833023 abstract "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." @default.
- W3027833023 created "2020-05-29" @default.
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- W3027833023 date "2020-12-01" @default.
- W3027833023 modified "2023-10-16" @default.
- W3027833023 title "Effect of high-content Yttria on the thermal expansion behaviour and ionic conductivity of a stabilised cubic Hafnia" @default.
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- W3027833023 doi "https://doi.org/10.1016/j.jeurceramsoc.2020.05.044" @default.
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