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Entropy regulation in spinel oxide with narrowed band gap and lattice distortion toward high-temperature infrared radiation.
- Source :
-
Journal of Alloys & Compounds . Aug2024, Vol. 994, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Typical infrared (IR) radiation materials, such as spinel structure with transition metal doping, remain challenges on IR radiation performance and thermal stability. Inspired by manipulatable entropy with desired properties, (Mg 1/5 Co 1/5 Ni 1/5 Cu 1/5 Zn 1/5)Al 2 O 4 (5MAl 2 O 4) with improved infrared radiation property and reduced thermal conductivity has been successfully synthesized. High-entropy strategy significantly narrows the band gap by impurity energy level formation, resulting in an improved 0.91 (0.78–2.5 μm). Simultaneously, 5MAl 2 O 4 emerges site inversion (tetrahedral and octahedral sites) and lattice distortion which benefits the outstanding infrared emissivity of 0.94 (2.5–15 μm, measured at 800 °C). Furthermore, 5MAl 2 O 4 reaches fairly low thermal conductivity of 2.1 W·m−1·K−1, 4–5 times decrease compared with MAl 2 O 4 end members. The remarkable infrared emissivity and low thermal conductivity offer great potential in energy conservation and heat dissipation. • Band gap narrowing and lattice distortion emerges in 5MAl 2 O 4. • The narrowed band gap of 5MAl 2 O 4 significantly promotes Near-IR radiation performance. • 5MAl 2 O 4 attains remarkable infrared emissivity of 0.91 (0.8–2.5 μm) and 0.94 (2.5–15 μm). • 5MAl 2 O 4 reaches fairly low thermal conductivity with 4–5 times decrease compared with MAl 2 O 4 end members. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 994
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 177224081
- Full Text :
- https://doi.org/10.1016/j.jallcom.2024.174631