Synthesis and colour properties of (Bi2O3)1-x(Gd2O3)x pigments

Abstract

(Bi2O3)1-x(Gd2O3)x solid solutions were synthesized as new inorganic yellow and orange pigments and their colour properties have been investigated as possible ecological materials. The pigments were prepared by the solid state reaction of mixed oxides (Bi2O3)1-x(Gd2O3)x with nominal compositions: x = 0.1 - 0.9. All the synthesized pigment samples were found to have colour coordinates, low a* and high b* and exhibit the colour from pale yellow to orange. Characterization of the (Bi2O3)1-x(Gd2O3)x solid solutions suggests that they have a potential to be alternative yellow colorants for paints, inks, plastics, and ceramics.