Effect of mineralizer on the synthesis of (Ni, Mn) co-doping CuFe5O8 pigment and its glazing performance

Novel Co and Cr free, high-temperature (Ni, Mn) co-doping CuFe 5 O 8 black ceramic pigments were synthesized. The effects of mineralizer type and mineralizer amount on the synthesis and coloration of (Ni, Mn) co-doping CuFe 5 O 8 pigments, as well as the effect of glazing calcination temperature on glaze coloration were systematically investigated using testing and characterization methods such as XRD, FE-SEM, TEM, EDS-mapping, HAADF and colorimeter. The results indicate that compared with H 3 BO 3 , NH 4 F, LiF and NaF mineralizers, the pigment with MgO as the mineralizer is relatively better. The optimized mineralizer MgO amount is 6.25 wt.% (mass ratio relative to the pigment). L *, a * and b * values of corresponding optimized pigment are 21.36, 1.10 and -0.24, respectively. The crystal phase of the pigment is CuFe 5 O 8 (73-2314), and no diffraction peak of the heterophase is detected. The crystal size of the pigments is 0.8-1.5 μ m with excellent dispersivity. The glazing temperatures have little effect on the coloration of the pigments when they are used at 1000 °C, 1150 °C and 1300 °C. The results show that the pigment has excellent high temperature resistance and is expected to be widely used in high-temperature glazing coloration. UV-Vis diffuse reflection spectra of the co-doping pigment, blank CuFe 5 O 8 sample, single MnO 2 -doping sample and single Ni 2 O 3 -doping sample.