Blocking of radiative thermal conduction in Zn2+-Incorporated high-entropy A2B2O7 fluorite oxides
- Title
- Blocking of radiative thermal conduction in Zn2+-Incorporated high-entropy A2B2O7 fluorite oxides
- Author
- 백운규
- Keywords
- Thermal barrier coatings; Thermal properties; Mechanical properties; Thermal radiation
- Issue Date
- 2021-12
- Publisher
- Elsevier Ltd
- Citation
- CERAMICS INTERNATIONAL, v. 47, NO. 23, Page. 33544-33553
- 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. © 2021
- URI
- https://www.sciencedirect.com/science/article/pii/S0272884221026638?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/178346
- ISSN
- 0272-8842;1873-3956
- DOI
- 10.1016/j.ceramint.2021.08.263
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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