High-entropy Rare-earth Ferrite "Cool Pigments" with High Near-infrared Reflectance and Infrared Emissivity
The utilization of near-infrared (NIR) reflective pigments has been proven effective in mitigating the heat island effect induced by building surfaces and decreasing energy consumption from air conditioning. In this particular research, (Y<sub>0.2</sub>Sm<sub>0.2</sub>Eu<sub>0.2</sub>Er<sub>0.2</sub>Gd<sub>0.2</sub>)<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> and (Y<sub>0.2</sub>Sm<sub>0.2</sub>Eu<sub>0.2</sub>Er<sub>0.2</sub>Bi<sub>0.2</sub>)<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> high-entropy ceramic powders were synthesized using the sol-gel method. The pigments were subjected to characterization through X-ray diffraction (XRD), scanning electron microscopy (SEM), colorimeter, and UV-vis-NIR spectrophotometer analysis. The results exhibited a garnet-like structure and a porous network morphology for both (Y<sub>0.2</sub>Sm<sub>0.2</sub>Eu<sub>0.2</sub>Er<sub>0.2</sub>Gd<sub>0.2</sub>)<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> and (Y<sub>0.2</sub>Sm<sub>0.2</sub>Eu<sub>0.2</sub>Er<sub>0.2</sub>Bi<sub>0.2</sub>)<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>. The samples displayed a yellow-green color and were found to possess exceptional acid and alkali resistance. Furthermore, the average near-infrared reflectance of the pigments within the 700 nm~2500 nm wavelength range exceeded 95%, while showcasing high emissivity in the 8 μm~14 μm wavelength range. As a result, it is anticipated that pigments fabricated utilizing this methodology will find valuable applications as " cool" pigments in coatings designed for building insulation and other related purposes.
Authors
- Yan-yu PAN
- Li-yan XUE
- Fan YANG
- Yan-yan HE
- Tao CHEN
Publication Details
- Journal
- Chinese Rare Earths
- Published
- 2024-12-01
- DOI
- https://doi.org/10.3724/s1004-0277.20240051
- Primary Topic
- Pigment Synthesis and Properties
- Type
- article
- Field-Weighted Citation Impact
- 0.00