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Cerium/aluminum correlation in aluminosilicate glasses and optical silica fiber preforms

机译:铝硅酸盐玻璃和光学二氧化硅纤维的铈/铝相关性

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AbstractOptical, structural properties and redox were studied for Ce-bearing silicate and aluminosilicate glasses and Ce-activated silica (SiO2) fiber preforms, by X-ray Absorption, Raman and Photoluminescence Spectroscopy.The introduction of Al2O3in Ce-bearing silicate glass strongly stabilizes reduced species in agreement with the optical basicity concept and additionally induces modifications in the Ce3+surrounding. In Al-free silica preforms, depending on the collapsing conditions, the Ce3+/ΣCe ratio has the highest variability (Ce3+/ΣCe=0.7–0.85±0.07), whereas in Al-bearing fiber preforms, Al codoping induces a strong stabilization of Ce3+species, despite the collapsing atmosphere.Al presence induces modifications on Ce local environment, and thus variations of the distance between Ce3+and its ligands, and/or to variations of the covalency of the bonds. Absorption bands in the UV region, ascribed to Charge-transfer (CT) bands, in our samples, occur only for low amount of Ce4+(Ce3+/ΣCe>0.85±0.07). Indeed, in silicate and aluminosilicate glasses the higher amount of Ce4+does not give rise to UV absorption bands ascribed to CT processes, whereas, in fiber preforms, Ce3+species can induce the trapping of hole centers, and enhance the photoluminescence efficiency. More generally, these results enhance our understanding of REE structural and chemical roles in amorphous materials and increase our knowledge for technical applications.Highlights?Optical properties and Ce redox were studied for glasses and Ce-doped silica fiber preforms, by Raman, luminescence and XAS?Al presence induces modifications of the distance between Ce3+and its ligands or variations of the covalency of the bonds?Photodarkening attenuation in Ce/Al fibers is due to higher amounts of Ce3+preventing defects formation by hole trapping]]>
机译:<![cdata [ 抽象 用于CE含硅酸盐和铝硅酸盐玻璃和CE激活二氧化硅的光学,结构性和氧化还原(SIO- 2 )光纤预制件,通过X射线吸收,拉曼和光致发光光谱。 Al 2 O 3 在CE承受中硅酸盐玻璃与光学碱度概念一致地强烈稳定了物种,并且另外引起CE 3 + 周围的修改。在Al-AliCarica预成型件中,根据折叠条件,CE 3 + /ΣCE比率具有最高的变化(CE 3 + /σce=0.7-0.85±0.07),而在亚式纤维预成型件中,Al Copoping会引起CE 3 + 物种尽管倒塌的气氛。 al presence在CE本地环境上引起修改,从而进行了变化CE 3 + 及其配体,和/或键的共价变化。在我们的样品中归因于电荷转移(CT)带中的UV区域中的吸收带仅用于低量CE 4 + (CE 3 + /ΣCE> 0.85±0.07)。实际上,在硅酸盐和铝硅酸盐眼镜中,CE 4 + 不会产生均匀的紫外线吸收带,而在纤维预成型件中,CE 3 + 物种可以诱导孔中心的捕获,并提高光致发光效率。更一般地说,这些结果提高了我们对无定形材料中的REE结构和化学作用的理解,并提高了我们对技术应用的知识。 亮点 ?< / ce:标签> 研究眼镜和ce掺杂的二氧化硅纤维预制件,通过拉曼,发光和xas来研究光学性质和ce redox:para> < / ce:list-item> Al Presence诱导修改ce 3 + 及其配体或债券共和率的变化s CE / Al纤维中的光映像衰减是由于CE 3 + 防止缺陷形成的Ce ]]>

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