S Sameera, K Rajesh, P Prabhakar Rao

New Sustainable Yellow Pigments in Scheelite type Solid Solutions: (LiLaCa)1/3MoO4−BiVO4 with High NIR Reflectance as Cool Colorants

  • General Chemistry
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Abstract New toxic metal-free sustainable yellow pigments are developed in the scheelite type solid solutions: [(Li0.33Ca0.33La0.33)xBi1-x][MoxV1-x]O4. The developed pigments show a structural transition from monoclinic to tetragonal scheelite type structure on substitutions of LiCaLaMoO4 into BiVO4 system. The absorption edge is gently blue shifted from the parent BiVO4by widening the band gap on incorporation of various metal ions Li, La, Ca and Mo in the lattice allowing to produce different intense yellow hues. The typical pigment [(LiLaCa)0.198Bi0.8][Mo0.2V0.8]O4 showed the most vivid yellow hue with b* value of 78.32 which is comparable to the commercial Sicopal yellow (b* = 76.9). Further, the developed toxic metal free pigments having high NIR reflectance make them sustainable for eco-friendly cool colorants for paint and plastic formulations.

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