ZHOU Xiaojian ¹, ZHANG Xiaozhen ^{1, 2}, LIU Huafeng ², CHEN Renhua ², HAN Botao ¹ , WANG Shaohua ¹, LI Lu ¹

(1. School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China; 2. Jiangxi Jinhuan Pigments Co., Ltd, Yichun 336000, Jiangxi, China)

Abstract: Rutile Ti_1-2xCr_xSb_xO₂ (x=0.050, 0.075, 0.100, 0.125) nanosized yellow pigments were prepared by using solid-phase method with metatitanic acid as the titanium source. The effects of Cr/Sb co-doping and calcination temperature on crystalline structure, chromogenic properties and microstructure of the Ti_1-2xCr_xSb_xO₂ pigments were systematically studied. It is found that rutile titanium - chromium yellow pigments were obtained with the co-doping of 5.0 mol%~12.5 mol% Cr/Sb. The redness value (a*) and yellowness value (b*) of the pigments increased firstly and then decreased with the increasing content of Cr/Sb. With increasing calcination temperature from 950 ℃ to 1200 ℃, the lightness value (L*) of the pigments decreased and the a* value increased gradually, while the b* value increased firstly and then decreased significantly. The doping of appropriate amount of chromium and antimony can effectively prevent the grain growth of the pigments. After calcination at 1100 ℃, the Ti_0.8Cr_0.1Sb_0.1O₂ pigment possessed the highest b* value of 46.64, showing a deep yellow hue with an average grain size of 211 nm and a near-infrared reflectivity of >69%. The titanium - chromium yellow pigments have good corrosion resistance to acidic and alkaline solutions and exhibited excellent stability and chromatic properties in the transparent glaze.

Key words: rutile-type structure; yellow pigments; chromium and antimony co-doping; stability; near-infrared reflectance