Study on Co-KZr_2(PO_4)_3-Type Crystalline Purple Ceramic Pigments

摘要

Using potassium carbonate, ammonium phosphate, zirconium dioxide, and cobalt oxide as raw materials, a kind of potassium zirconium phosphate ceramic pigments with bright purple color at high temperature were obtained through a series of optimizing experiments. It's a novel type of ceramic pigments with chromaticity indexes of L~*=55.37, a~*=18.52, and b~*=-30.56. X-ray diffraction (XRD), TG-DTA and chroma analysis were employed to characterize the pigments. The results reveal that potassium zirconium phosphate type ceramic pigments presenting bright purple color is due to Co~(2+) partially replace Zr~(4+) in potassium zirconium phosphate crystal lattice, which leads to the lattice distortion because of the formation of Zr_(2-x)Co_(2x)(PO_4)_3 phase. Moreover, owing to the limitation of solubility of Co~(2+) in potassium zirconium phosphate crystal lattice, the contents of cobalt oxide added may not be too much.