Preparation and characterization of Co-doped ZnO-Al2O3-SiO2 glass-ceramics by the sol-gel method |
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| Authors: | XL DuanDR Yuan D XuMK Lu XQ WangZH Sun ZM WangHQ Sun YQ Lu |
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| Affiliation: | State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China |
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| Abstract: | Transparent glass-ceramics containing Co2+:ZnAl2O4 nanocrystals were obtained by the sol-gel process for the first time. The gels of composition 89SiO2-5.9Al2O3-4.9ZnO-0.2CoO (ZAS) were prepared at room temperature, and heat-treated at different temperatures. The microstructure and optical properties of the heated samples were studied by using X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared spectroscopy, and optical absorption spectra. Co2+:ZnAl2O4 nanocrystals were precipitated from ZAS system and dispersed in the SiO2-based glass during heat-treatment in the temperature range 900-1100 °C. Co2+ ions were located in tetrahedral sites in ZnAl2O4 nanocrystals. The Co2+:ZnAl2O4 crystallite size was in the range of 4-15 nm. |
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| Keywords: | Ceramics Nanostructure Sol-gel chemistry X-ray diffraction Electron microscopy |
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