LIU Wei, CAO Chun’e, CHEN Yunxia, LU Xilong, SHEN Huarong
(Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)
Abstract: Fe2O3/SiO2 red ceramic pigment was synthesized via a microwave hydrothermal approach using FeCl3 • 6H2O as the source of Fe2O3, TEOS as the source of SiO2 , NaF as a mineralizer and NaOH as a precipitant, respectively. The effect of precursor solution’s pH value on inclusion status and color generation of the synthesized powders was discussed. The samples were characterized by TEM and colorimetric analysis. The results showed that te color of the as-prepared samples turned gradually from red to yellow and even white with the increasing of precursor solution’s pH values. Simultaneously, the inclusion status shifted from SiO2 loosely packed on the surface of Fe2O3to needle covered, particle coating with cross-linked structure and ultimately thick sheet covered structure.
Key words: microwave-hydrothermal method; Fe2O3/SiO2 red pigment; pH value; inclusion status; color generation