Study on Co-KZr2(PO4)3-Type Crystalline Purple Ceramic Pigments
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 Co2+ partially replace Zr4+ in potassium zirconium phosphate crystal lattice, which leads to the lattice distortion because of the formation of Zr2-xCo2x(PO4)3 phase. Moreover, owing to the limitation of solubility of Co2+ in potassium zirconium phosphate crystal lattice, the contents of cobalt oxide added may not be too much.
Shengyi Li, Yingchun Liu, Rongbo Zhu, Hongguang Li, Wensi Ding
X. Y. Gu et al., "Study on Co-KZr2(PO4)3-Type Crystalline Purple Ceramic Pigments", Applied Mechanics and Materials, Vols. 34-35, pp. 790-794, 2010