Blocking of radiative thermal conduction in Zn2+-Incorporated high-entropy A2B2O7 fluorite oxides
- 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
- Issue Date
- Dec-2021
- Publisher
- Elsevier Ltd
- Keywords
- Thermal barrier coatings; Thermal properties; Mechanical properties; Thermal radiation
- Citation
- CERAMICS INTERNATIONAL, v.47, no.23, pp.33544 - 33553
- Indexed
- SCIE
SCOPUS
- Journal Title
- CERAMICS INTERNATIONAL
- Volume
- 47
- Number
- 23
- Start Page
- 33544
- End Page
- 33553
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/140249
- DOI
- 10.1016/j.ceramint.2021.08.263
- ISSN
- 0272-8842
- Abstract
- 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.
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