Influence of crystallite size on color properties and NIR reflectance of TiO2@NiTiO3 inorganic pigments

• DOI: 10.1016/j.ceramint.2021.01.126
• Publication Date: 2021-01-14T17:24:26Z
• Authors: Jian Zou; Yongpan Chen; Peng Zhang
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract Crystallite size may significantly impact optical properties of inorganic pigments. However, limited studies have so far been reported in this area. In this work, TiO2@NiTiO3 complex pigments were synthesized by precipitation-calcination method. Results showed that the increase in calcination temperature led to the formation of TiO2@NiTiO3 pigments with crystallite sizes from 29 to 82.6 nm but similar morphologies and aggregate particle sizes (around 1 μm). The yellow component (b*) significantly increased by 7 with crystallite size, but the integrated NIR reflectance decreased slightly (4.02%). Also, the characteristic absorption of NiTiO3 pigments in NIR region declined the integrated NIR reflectance values.