文摘
The new application of YMnO3 as a high near-infrared (NIR) reflective inorganic pigment has been developed. Single-phased perovskite nanocrystalline YMnO3 samples with different average sizes have been synthesized through a polyacrylamide gel route. With the calcination temperature increasing from 700 ¡ãC to 900 ¡ãC, the color of the samples is blue-green, and the broad band value decreases from 1.89 to 1.58 eV due to the O2p-Mn3d charge-transfer transition. The NIR reflectance and solar reflectance values of corresponding pigmented coating increase from 51.4 % to 53.4 % and from 23.9 % to 32.5 % , respectively, which are higher than that of commercially available roofing products of the same color. The prepared YMnO3 pigment can be well served as colored ¡°cool colorant¡±.