Microstructure and Properties of Co2+: ZnAl2O4/SiO2 Nanocomposite Glasses Prepared by Sol–Gel Method |
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| Authors: | Xiu-Lan Duan Duo-Rong Yuan Xiu-Feng Cheng Hai-Qing Sun Zhi-Hong Sun Xin-Qiang Wang Zeng-Mei Wang Dong Xu Meng-Kai Lv |
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| Affiliation: | State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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| Abstract: | Transparent bulk Co2+: ZnAl2O4/SiO2 nanocomposites containing nanocrystalline Co2+: ZnAl2O4 dispersed in silica glass matrix were obtained by the sol–gel method. The gels of composition 89SiO2–6Al2O3–5ZnO− x CoO ( x =0.2, 0.4, 0.6, 0.8, 1.0) (mol%) were prepared at room temperature by using two different aluminum salts, aluminum nitrate and aluminum alkoxide (aluminum-iso-propoxide, Al(OPri)3), as starting materials. The transparent gels were converted to the crystalline phase of gahnite by heating above 900°C. The microstructural evolution of gels was characterized. The effect of Co2+ concentration on spectroscopic properties was also discussed. Co2+: ZnAl2O4 nanocrystals dispersed in the SiO2-based glass are formed at lower heat-treatment temperature and shorter heating time by using Al(OPri)3 as raw material. |
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