Study of new colour pigments based on Bi2O3

Abstract

In this work we have studied the colour properties of the Bi2O3 -Ln2O3 system. By solid state reaction we have prepared the mixed oxides (Bi2O3)1-x(Ln2O3)x, where Ln=Er and Ho, with nominal compositions x=0.1, 0.3 and 0.5, and at calcination temperature 800 °C. The structure of prepared compounds was studied by X-ray diffraction analysis. The obtained orange oxide pigments present f.c.c. flurite-type structure. The colour properties measured in the visible region of light (400-700 nm) indicate that the pigments can be expected as new ecological inorganic pigments.