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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 >Further investigations of the effect of replacing lithium by sodium on lithium silicate scintillating glass efficiency
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Further investigations of the effect of replacing lithium by sodium on lithium silicate scintillating glass efficiency

机译：钠替代锂对硅酸锂闪烁玻璃效率影响的进一步研究

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Ce ~(3+) doped lithium (~6Li) silicate glasses are thermal neutron detectors. Prior work showed that when sodium (Na) is substituted for Li the scintillation efficiency, under beta particle stimulation, increased and then decreased as the sodium (Na) content was increased. When all the ~6Li was replaced by Na no scintillation was observed. Raman spectra, acquired using a visible excitation source, provided no evidence of anomalous behavior. SEM microscopy did show some phase separation, but there was no obvious correlation with the scintillation efficiency. We have reexamined these glass samples using deep UV Raman excitation which reduces fluorescence interference. The newly acquired spectra show evidence of phase separation in the glasses. Specifically we see a peak at 800 cm ~(- 1) Raman shift which can be assigned to a vitreous silica moiety that results from phase separation. There is a strong correlation between this peak's area, the scintillation efficiency, and the Na content. The observed trend suggests that phase separation enhances scintillation and addition of Na reduces the amount of phase separation. We also see evidence of at least two defect structures that can be tentatively assigned to a three-membered ring structure and an oxygen vacancy. The latter is fairly strongly correlated with enhanced scintillation efficiency.
机译：Ce〜（3+）掺杂的锂（〜6Li）硅酸盐玻璃是热中子探测器。先前的工作表明，当钠（Na）代替Li时，在β粒子刺激下，闪烁效率先增加，然后随着钠（Na）含量的增加而降低。当所有〜6Li被Na取代时，未观察到闪烁。使用可见激发源获得的拉曼光谱没有提供异常行为的证据。 SEM显微镜确实显示出一些相分离，但与闪烁效率没有明显的相关性。我们使用深紫外拉曼激发技术（降低了荧光干扰）重新检查了这些玻璃样品。新获得的光谱显示了玻璃中相分离的证据。具体而言，我们在800 cm〜（-1）拉曼位移处看到一个峰，该峰可归因于相分离产生的玻璃状二氧化硅部分。这个峰的面积，闪烁效率和Na含量之间有很强的相关性。观察到的趋势表明，相分离增强了闪烁，而Na的添加减少了相分离的量。我们还看到至少两个缺陷结构的证据，这些缺陷结构可以暂时分配给三元环结构和氧空位。后者与增强的闪烁效率有很强的相关性。

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