The thermal synthesis of the ZnO-Bi2O3 pigments

A zinc oxide pigment with an admixture of bismut oxide has been prepared as new yellow pigment for colouring of plastics and paints. The effect of the Bi2O3 in the starting mixture on the colour hue of the pigment has been ev aluated. The calcination conditions of the pigment synthesis have been esta blished. The synthesis of these pigments was followed by thermal analysis u sing a derivatograph apparatus in our laboratory. The optimum conditions fo r the synthesis of pigments and the properties of the products have been es timated.