Nanocrystalline cobalt titanate (CoTiO₃) has been synthesized from a well-mixed precursor. The precursor was prepared by a homogeneous precipitation method, in which urea was used as the precipitator. The as-synthesized sample is a mixture of CoTiO₃ and rutile nanocrystallites with mean sizes of around 50 nm. It strongly absorbs visible light in the wavelength range of 500 - 690 nm besides ultraviolet light (wavelength << 370 nm). We found the synthetic CoTiO₃ is a semiconducting material with a direct band gap of 2,53 eV. The green CoTiO₃ has two absorbance peaks at the wavelengths of 537 and 606 nm, which correspond to the photon energies of 2,31 and 2,05 eV, respectively.

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