Studies on the preparation and characterization of composite La-doped γ-Ce2S3-coated mica cool pigments

• Published in: Applied physics. A, Materials science & processing Vol. 126; no. 6
• Main Authors: Guo, Jianming, Ye, Mingquan, Han, Aijun, Liao, Jun, Chen, Chenlu
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2020; Springer Nature B.V
• Subjects: Applied physics; Characterization and Evaluation of Materials; Color; Condensed Matter Physics; Crystal structure; Machines; Manufacturing; Materials science; Mica; Morphology; Nanotechnology; Optical and Electronic Materials; Optical properties; Physics; Physics and Astronomy; Pigments; Processes; Reflectance; Surfaces and Interfaces; Thermal stability; Thin Films; Ultraviolet absorption; UV absorption; Ce; S; La; Near-infrared reflectance; mica; Thermal stabilization; Cool pigment
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-020-03641-z

In this paper, a new series of γ -Ce 2- x La x S 3 /mica ( X ranges from 0 to 0.8) pigments were synthesized by depositing La-doped γ -Ce 2 S 3 pigments on mica to improve the color and optical properties of the pigments. XRD, SEM, TG, EDS, UV–VIS-NIR diffuse reflection spectrum and CIE- L * a * b * color scale were used to characterize the crystal structure, morphology, optical properties, thermal stability and color properties of γ -Ce 2- x La x S 3 /mica pigments. The results show that the cubic crystal structure of γ -Ce 2- x La x S 3 /mica pigments has been successfully prepared. In addition, the thermal stabilization temperature of γ -Ce 1.6 La 0.4 S 3 /mica pigment reaches 550 °C, and composite γ -Ce 2- x La x S 3 /mica pigments have excellent color stability and ultraviolet absorption ability. More importantly, the composite pigments also have higher NIR diffuse reflectance and solar reflectance than pure γ -Ce 2 S 3 ; the NIR solar reflectance of γ -Ce 1.6 La 0.4 S 3 /mica pigment could be improved up to 89.64%. These excellent properties indicate that γ -Ce 2- x La x S 3 /mica pigments can be used as cool pigments in the near-infrared and ultraviolet ranges.