Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Mn-doping Effect on the Blackness and NIR Reflectance of Fe2O3 Cool Pigments

Mn 도핑이 Fe2O3 쿨 안료의 흑색도 및 NIR 반사율에 미치는 영향

  • Hwang, Jin Soo (Department of Chemical Engineering, Kongju National University) ;
  • Jung, Kyeong Youl (Department of Chemical Engineering, Kongju National University)
  • 황진수 (공주대학교 화학공학부) ;
  • 정경열 (공주대학교 화학공학부)
  • Received : 2021.02.11
  • Accepted : 2021.02.24
  • Published : 2021.02.28
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Abstract

A high NIR-reflective black pigment is developed by Mn doping of Fe2O3. The pigment powders are prepared by spray pyrolysis, and the effect of the Mn concentration on the blackness and optical properties is investigated. Mn doping into the crystal lattice of α-Fe2O3 is found to effectively change the powder color from red to black, lowering the NIR reflectance compared to that of pure Fe2O3. The pigment doped with 10% Mn, i.e., Fe1.8Mn0.2O3, exhibits a black color with an optical bandgap of 1.3 eV and a Chroma value of 1.14. The NIR reflectance of the prepared Fe1.8Mn0.2O3 black pigment is 2.2 times higher than that of commercially available carbon black, and this material is proven to effectively work as a cool pigment in a temperature rise experiment under near-infrared illumination.

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