Synthesis of Perovskite Brown Pigments

摘要

This study aims to synthesize Cr doped Perovskite brown pigments. The pigment were synthesized by doping Cr_2O_3(0.01 ～ 0.05mole) for TiO_2(0.993 ～ 0.963 mole) at 1150 ～ 1350℃. The samples were characterized by X-ray diffraction (XRD), Raman Spectrometer, Scanning Electron Microscope(SEM) and the UV/Vis spectroscopy. The optimum composition was CaCr_(0.03)Ti_(0.978)O_3 and heating condition was 1300 ℃ for 3h of soaking time. The doped Cr ion for Perovskite was observed to be Cr( Ⅲ) and Cr(Ⅳ). The brown color was mixed with violet doped by Cr~(4+)(~3A_2 ～ ~3T_2) and Blueish-Green doped by Cr~(3+)(~4A_(2g) → ~4F_(1g)). The results of SEM analysis showed the Perovskite structure and the particle size was approximately 2μm. The color in Frit 6060 glaze adding 10wt% pigment was Redish Brown, and CIE Lab parameters were L~*= 41.53, a~*=13.27 and b～*=9.94.