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Preparation and characterization of Co2TiO4 and doped Co2−x M x TiO4 (M = Zn2+, Ni2+)-coated mica composite pigments

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Green composite pearlescent pigments were prepared by coating Co2TiO4 and doped Co2−x M x TiO4 nanoparticles on mica. The effects of calcination temperature, Ti/Co mole ratio and doped ions Ni2+ and Zn2+ on the crystal structure of mica/Co2−x M x TiO4 were studied. Scanning electron microscopy, atomic force microscopy and X-ray diffraction (XRD) technique were employed to characterize the morphology and crystal features of the composite particles. TG–DSC analysis and XRD patterns analysis showed that the appropriate calcination temperature for mica/Co2TiO4 pigments was about 1000 °C. UV–Vis spectroscopy and CIE L*a*b* parameters revealed that the composite pigments were yellow-green, and the color and colorimetric parameters changed with the particle size of mica, types of coated pigments and coating amount of pigments on mica. Moreover, the lightness L* of mica/Co2−x M x TiO4 pigments was larger than that of undoped mica/Co2TiO4, and it increased with increasing doped Zn2+ and Ni2+ content.

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This work was supported by a program funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Correspondence to Mingquan Ye.

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Zhang, S., Ye, M., Han, A. et al. Preparation and characterization of Co2TiO4 and doped Co2−x M x TiO4 (M = Zn2+, Ni2+)-coated mica composite pigments. Appl. Phys. A 122, 670 (2016).

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