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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Structural features and optical properties of CeO2-containing borosilicate glass based on spectroscopic analysis
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Structural features and optical properties of CeO2-containing borosilicate glass based on spectroscopic analysis

机译：基于光谱分析的含CeO2的硼硅酸盐玻璃的结构特征和光学性质

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摘要

Borosilicate glasses with composition 63SiO2-10B2O3-3Al2O3-10Na2O-10K2O-4BaO doped with 1 and 3 mol% cerium oxide (CeO2) were melted at 1500°C followed by annealing at 550°C after quenching. Spectroscopic analysis of the as-prepared glasses using infrared spectroscopy, Raman spectroscopy and UV-visible spectrometry was performed to study the effects of CeO2 doping on the structure and optical properties of the glass. The vibrational spectra of the glasses reveals appreciable changes in relative intensities as a function of the CeO2 content. The transmission spectra and the derived parameter plots exhibit red-shift of the cut-off wavelength as well as a reduction in the optical band gap and energy gap tail in varying degrees compared to the base glass. These changes indicate structural modifications of glass network and electronic structural variations arising from doping and the polyvalent state of the cerium cation. As a network modifier, cerium in borosilicate glass gives rise to number of nonbridging oxygens resulting in scission of the Si-O network and incomplete conversion of [BO3] to [BO4], whereas elevated cerium concentrations suppress further depolymerization of the Si-O network due to the co-existence of tetravalent and trivalent cerium ions, and hence inhibits further reductions in the optical band gap and energy gap tail. Meanwhile the equilibrium between structural disorder and defect repair stemming from polyvalent cerium is proposed to be responsible for the limited decrement of the energy gap tail.
机译：掺杂有1和3 mol％氧化铈（CeO2）的成分为63SiO2-10B2O3-3Al2O3-10Na2O-10K2O-4BaO的硼硅酸盐玻璃在1500°C熔融，淬火后在550°C退火。使用红外光谱，拉曼光谱和紫外可见光谱对制备的玻璃进行光谱分析，以研究CeO2掺杂对玻璃结构和光学性能的影响。玻璃的振动光谱表明，相对强度随CeO2含量而变化。与基础玻璃相比，透射光谱和导出的参数图显示了截止波长的红移以及光学带隙和能隙尾部的减少程度不同。这些变化表明玻璃网络的结构改性以及由于掺杂和铈阳离子的多价态引起的电子结构变化。作为网络改性剂，硼硅酸盐玻璃中的铈会增加非桥连氧的数量，从而导致Si-O网络的断裂和[BO3]到[BO4]的不完全转化，而铈浓度的升高会抑制Si-O网络的进一步解聚由于四价和三价铈离子共存，因此抑制了光学带隙和能隙尾的进一步减小。同时，提出了由多价铈引起的结构紊乱与缺陷修复之间的平衡是造成能隙尾部有限减小的原因。

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