Blocking of radiative thermal conduction in Zn2+-Incorporated high-entropy A2B2O7 fluorite oxides

In this study, a high-entropy approach was employed to design a new single-phase A2B2O7 oxide for thermal insulation applications. Multicomponent high-entropy oxides, containing up to seven different cations, were successfully synthesized in a single defective fluorite structure. We observed that th...

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Bibliographic Details
Published in:Ceramics international 2021-12, Vol.47 (23), p.33544-33553
Main Authors: Song, Dowon, Ryu, Myeungwoo, Kwon, Jiseok, Lyu, Guanlin, Kim, Junseong, Jeon, Hak-Beom, Song, Taeseup, Paik, Ungyu, Yang, Byung-il, Jung, Yeon-Gil, Oh, Yoon-Suk
Format: Article
Language:English
Subjects:
Mechanical properties
Thermal barrier coatings
Thermal properties
Thermal radiation
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Summary:In this study, a high-entropy approach was employed to design a new single-phase A2B2O7 oxide for thermal insulation applications. Multicomponent high-entropy oxides, containing up to seven different cations, were successfully synthesized in a single defective fluorite structure. We observed that the incorporation of the functional cation, Zn2+, effectively blocked the heat radiation phenomenon by reducing the photon mean free path, and further reduced the high-temperature thermal conductivity owing to the larger free carrier concentration originated from the large number of oxygen vacancies. Although a large concentration of Zn2+ caused a slight reduction in thermal expansion, this study suggests that functional cations can be easily incorporated; thus, expanding the material diversity beyond the typical doping levels to develop new thermal barrier materials.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2021.08.263