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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Effect of reducing sintering atmosphere on Ce-doped sol-gel silica glasses
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Effect of reducing sintering atmosphere on Ce-doped sol-gel silica glasses

机译：减少烧结气氛对掺铈溶胶凝胶二氧化硅玻璃的影响

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摘要

The effect of sintering atmosphere on the optical and structural properties of Cerium doped sol-gel silica was investigated. Two sets of xerogels with Ce concentration from 0 to 10 mol% were prepared and densified in different conditions. The effect of a post-densification rapid thermal treatment was also considered. Optical absorption measurements evidenced that in oxidizing conditions Cerium is preferably incorporated inside the silica matrix as Ce4+ while the trivalent state is favoured by reducing conditions. Transmission electron microscopy images show rare-earth clusters formation whose nature was investigated by means of Raman, EDS and microdiffraction measurements. in order to evaluate the efficiency of the glasses as scintillating materials radio-luminescence measurements were carried out. A numerical fit of RL spectra showed the presence of two components peaking at 2.7 and 3.1 eV. After RTT, the relative intensity of the 3.1 eV component increases with Ce concentration.
机译：研究了烧结气氛对掺铈溶胶凝胶二氧化硅光学和结构性能的影响。制备两组Ce浓度为0至10mol％的干凝胶，并在不同条件下致密化。还考虑了致密化后快速热处理的效果。光吸收测量表明，在氧化条件下，优选将铈作为Ce4 +掺入二氧化硅基质内部，而还原条件有利于三价态。透射电子显微镜图像显示稀土簇的形成，其性质通过拉曼光谱，EDS和微衍射测量进行了研究。为了评估玻璃作为闪烁材料的效率，进行了放射性发光测量。 RL光谱的数值拟合表明，存在两个峰值分别为2.7和3.1 eV的组分。 RTT后，3.1 eV组分的相对强度随Ce浓度的增加而增加。

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