Synthesis and characterization of a new high near-infrared reflectance yellow pigment: Bi2-xErxMoO6

摘要

? 2022 Elsevier Ltd and Techna Group S.r.l.A series of environmentally friendly near-infrared reflective pigments Bi2-xErxMoO6 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) were synthesized by high temperature solid-state method. The optical and structural characteristics of the synthesized pigment were characterized by ultraviolet–visible–near infrared diffuse reflection spectrum (UV–Vis–NIR spectrum), X-ray diffractometer (XRD), scanning electron microscopy (SEM). The color of the samples changed from milky white to yellow with increasing Er3+ doping concentration. Importantly, the Er3+-doped Bi2MoO6 pigments exhibit high NIR reflectance (ranging from 90.5 to 106.1) in 700–2500 nm region and which is higher than the NIR reflectance of commercially available bismuth vanadate pigment (80). Compared with BaSO4, Bi2-0.6Er0.6MoO6 exhibits 106.1 NIR reflectance and 99.6 NIR solar reflectance. The thermal insulation experiments show that the bottom temperature of the aluminum plate coated with Bi2MoO6: Er coating decreases by 3 °C compared with that of the TiO2 coating. Meanwhile, acid and alkali resistance tests show that these pigments may have a well chemically stable in the natural environment. We believe that the samples may have important applications in antisolar irradiation, energy saving and environmental protection.