Mehrdad Pakdehi - Department of Materials Eng., Science and Research branch, Islamic AzadUniversity, Tehran, Iran
Hamid Reza Rezaie - School of Metallurgy and Materials Eng., Iran University of Science and Technology,Tehran, Iran
Saeid Baghshahi - Technical and Engineering Department, Imam Khomeini International University,Qazvin, Iran

In this study, a nano ceramic black pigment based on cobalt ferrite was synthesized usingcoprecipitation method.The purpose of this study was to investigate the properties of nano black pigments along withreference sample. The different stoichiometeric ratios of cobalt ferrite nano pigments wereinvestigated. Pigments were applied with certain amount on the glazed tile by dropping method.Identifying the phases of the synthesized nano-pigments and reference along with determiningthe crystalline size was performed by X-ray diffraction pattern. To study the microstructure ofthe particles, scanning electron microscope was used. The color parameters of the samples wereobtained by spectrophotometer system (CIE-Lab).The results showed that by co-precepitation method could achieve a particle size smaller than۱۰۰ nm. On the other hand, according to the color parameters, the best results belong to thenano pigments calcined at ۸۰۰ ºC with the stoichiometric ratio of Co۲+ ۱: ۲ Fe۳+ (CoFe۲O۴).This nano black pigment had better intensity of pure black shade than Nano commercial blackpigment

Nano Pigment, Co-precipitation, Cobalt ferrite, Colorimeteric parameters