Crystal structure, chromatic and near-infrared reflective properties of iron doped YMnO3 compounds as colored cool pigments

摘要

The new application of YFe_xMn_(1-x)O3 (x = 0, 0.05, 0.10, 0.15 and 0.20) compounds as colored cool inorganic pigment has been developed. Nanocrystalline YFe_xMn_(1-x)O3 samples with different average grain sizes have been synthesized by modified citrate method at a certain calcination temperature. The structure of these compounds changes by the increase in degree of substitution from the hexagonal to the orthorhombic perovskite. With the increase of Fe content, the color of the designed pigments changes from blue-green to pale blue and then dark blue. Most importantly the near-infrared reflectance and solar reflectance values of corresponding pigmented coatings increase from 47.6 to 60.6% and from 20.4 to 28.4% with increasing Fe content from x = 0 to 0.15, respectively, which are higher than that of commercially available roofing materials of the same color.