Environmentally Friendly High-Near-Infrared Reflectance Blue Pigment YIn0.9–xMn0.1MxO3−δ Based on Li/Zn Doping
In this work, the Li/Zn-doped near-infrared reflective inorganic blue pigment YIn0.9–xMn0.1MxO3−δ (M = Li/Zn, x = 0–0.4) was synthesized by the high-temperature solid-state reaction method. The phase structures, morphologies, color properties and optical properties of synthetic pigments were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), CIE1976 color space system, UV–vis-NIR spectrophotometer, and other instruments. All the doped samples have a hexagonal structure with space group P63cm (185). Compared with YIn0.9Mn0.1O3 (b* = −45.91), Li/Zn doped pigments have richer blue hues (b* is ranged from −29.59 to −55.14), which can meet the needs of public’s demands for blue hues. The NIR solar reflectance (R*) of all the samples are above 70%, and the highest R* with different doping concentrations can reach 86% (M = Li, x = 0.2), which is about 16% higher than YIn0.9Mn0.1O3. YIn0.9–xMn0.1MxO3−δ (M = Zn/Li, x = 0–0.4) are indicated to possess higher near-infrared solar reflectivity than other blue compounds, including commercial products. The surface temperature difference between the Li-doped (x = 0.2)/Zn-doped (x = 0.1) paints and commercial ultramarine paint can reach about 20 and 10 °C, respectively. The above properties ensure the potential applications of environmentally friendly YIn0.9–xMn0.1MxO3−δ pigments with a rich blue-hue in the field of energy-saving materials.
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