TAO Rui ¹, JIANG Yuhua ¹, LIU Huafeng ², ZHANG Xiaozhen ^1,2, CHEN Renhua ², CHANG Qibing ^1,2, WANG Yongqing ^1,2
(1. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. Jiangxi Jinhuan Pigments Co., Ltd., Yichun 336000, Jiangxi, China)

Abstract: Doped Bi_0.9M_0.1VO₄ (M = Zn, Y, La, Sm) yellow pigments were prepared by aqueous coprecipitation method. The influence of different metal ions doping on the phase structure, color performance and morphology of prepared BiVO^4-based pigments was investigated by means of colorimetric spectrophotometer, X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet/visible light reflectance spectroscopy and infrared spectroscopy analyses. Results show that the Zn²⁺ doped sample has the same monoclinic scheelite structure as the pure BiVO₄ pigment. The yellow hue (b*) and chroma (C*) of the sample were increased obviously with the doping of 10 mol% Zn²⁺. The obtained pigment shows bright greenish yellow. The La³⁺ doped sample is mainly composed of monoclinic crystalline phase with minor tetragonal phase, and shows a hazy yellow with reduced b* value. With Y³⁺ and Sm³⁺ doping, the phase structure is completely changed to be tetragonal, which leads to faint yellow. The Zn²⁺ doping can reduce the grain size and improve the dispersity of pigment powder, while the La³⁺ doped sample mostly consists of plate particles with serious aggregation.
Key words: bismuth vanadate; yellow pigment; metal ion; doping; coprecipitation method