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 is-land effect induced by building surfaces and decreasing energy consumption from air conditioning.In this particular research,(Y0.2Sm0.2Eu0.2Er0 2Gd0 2)3Fe5O12 and(Y0.2Sm0.2Eu0.2Er0 2Bi0 2)3Fe5O12 high-entropy ceramic powders were synthesized u-sing 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(Y0.2Sm0.2Eu0.2Er0.2Gd0.2)3Fe5O12 and(Y0.2Sm0.2Eu0.2Er0.2Bi0.2)3Fe5O12.The samples displayed a yellow-green color and were found to possess exceptional acid and alkali resistance.Furthermore,the av-erage near-infrared reflectance of the pigments within the 700 nm～2500 nm wavelength range exceeded 95％,while showcas-ing high emissivity in the 8 μm～14 pm 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.
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