Blocking of radiative thermal conduction in Zn2+-Incorporated high-entropy A2B2O7 fluorite oxides
| Autor: | Taeseup Song, Hak-Beom Jeon, Yeon-Gil Jung, Guanlin Lyu, Dowon Song, Myeungwoo Ryu, Jiseok Kwon, Yoon-Suk Oh, Junseong Kim, Ungyu Paik, Byung-il Yang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Mean free path Process Chemistry and Technology Oxide Thermal conduction Thermal expansion Surfaces Coatings and Films Electronic Optical and Magnetic Materials Thermal barrier coating chemistry.chemical_compound Thermal conductivity chemistry Thermal insulation Thermal radiation Chemical physics Materials Chemistry Ceramics and Composites business |
| Zdroj: | Ceramics International. 47:33544-33553 |
| ISSN: | 0272-8842 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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