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Abstract
The formation of Zn0.6Co0.4Fe2O4 spinel-based pigments by sol–gel method and post-annealing pathway and the impact of polyol structure on their properties were investigated. The phase evolution and mass changes of gels during annealing were assessed by thermal analysis. The differential thermal analysis revealed that above 400 °C the carboxylate precursors decompose to ZnFe2O4, CoFe2O4, and Zn2SiO4. X-ray diffraction pattern showed the presence of crystalline ZnFe2O4, CoFe2O4, Zn2SiO4, and SiO2, while Fourier transform infrared spectra confirmed the formation of metal-carboxylates and SiO2 matrix at 200 °C and formation of ZnFe2O4, CoFe2O4, and Zn2SiO4 at 1200 °C. The atomic force microscopy images showed spherical nanoparticles of size and shape varying with the polyol structure. The coloring properties and the potential ceramic applications of the obtained dark gray powders were tested by their embedding in opaque and transparent tile glazes and their application on ceramic tile.
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