Synthesis and characterization of multi-colored pigments of LiRE(MoO4+δ)2 (RE = Ce, Pr, Nd, Er) with high near-infrared reflectance

Multi-colored pigments based on rare earth (RE) with the formula of LiRE(MoO4+8)2 (RE = Ce, Pr, Nd, Er) were developed via the solid-state reaction method. Related characterization techniques were used for investigating the crystal structure, morphology characteristic, reflecting property, and color performance of the synthesized pigment. The prepared pigment of LiRE(MoO4+8)2 (RE = Ce, Pr, Nd, Er) shows four colors, namely orange-yellow (Ce), bright green (Pr), lavender (Nd) and pink (Er). Moreover, all of the pigments possess high NIR reflectance in the range of 95-98% at 1100 nm. Remarkably, the average NIR reflectance of LiCe(MoO4+8)2 pigment reaches up to 95.28%, and the NIR solar reflectance is also up to 95.02%. Besides, the pigment of LiCe(MoO4+8)2 exhibits good yellow hue (b* = 75.08). The application practical of LiCe(MoO4+8)2 coated on galvanized sheet exhibits excellent coloring performance. The designed pigments show chemical stabilities in the acid/alkali testing. All of above, the superior performances of color and reflectance from LiRE(MoO4+8)2 provide visual enjoyment for people and exhibit potential for energy savings.

Automated summary

Multi-colored pigments based on rare earth LiRE(MoO4+8)2 (RE = Ce, Pr, Nd, Er) were developed using the solid-state reaction method. These pigments show four colors and possess high NIR reflectance, with good chemical stability.