Synthesis and coloring properties of novel stablized green Ni0.15Mg Al2(0.85-)Ti1.15+O5 pigments

Novel stablized green Ni0.15MgxAl2(0.85-x)Ti1.15+xO5 (0 ≤ x ≤ 0.25) pigments were prepared by solid-state method using Ni2O3 as colorant and Mg(CH3COO)2‧4H2O as auxiliary stabilizer. The synthesised pigments were characterized via XRD, XPS, SEM, TEM, UV-Vis, and automatic colorimeters. The results show that Mg-doping increases the oxygen vacancies, resulting in a positive shift of the binding energy of Ni2+ irons. The formation of Ni0.15MgxAl2(0.85-x)Ti1.15+xO5 solid solution greatly increases the energy transfer energy and shifts the emission to lower wavelengths (530 nm), corresponding to the visible diffuse reflection of green light. The chromaticity of the pigment changed little (L*=72.51, a*=−18.16, b*=20.94) at 1200 ℃ for 10 h, showing excellent thermal stability. The properties especially excellent thermal stability makes it promising novel green pigments in ceramic industry application.