Abstract
Abstract Co2+-doped LiGa5O8 nanocrystalline powders were prepared by a sol–gel method. The gels and sintered samples were characterized by means of thermogravimetry and differential scanning calorimetry (TG/DSC), X-ray diffraction (XRD), Inductively coupled plasma-atomic emission spectrometry (ICP-AES), transmission electron microscope (TEM), Fourier transform infrared (FT-IR) spectra and near-infrared absorption spectrum. LiGa5O8 nanocrystals were produced by calcining the gel above 500 °C, with the crystallite size of 10–30 nm in the temperature range of 500–700 °C. The absorption spectrum of Co2+-doped LiGa5O8 exhibited a broad absorption band near 1.5 μm, which indicated that Co2+ ions substituted for the tetrahedrally coordinated Ga3+ ions in the LiGa5O8 lattice.
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