Sm-，Gd-共掺杂对β-辐照下铝硼硅酸盐玻璃结构变化的影响
Effect of Sm-, Gd- codoping on structural modifications in aluminoborosilicate glasses under beta-irradiation
摘要：
本文研究了两个系列不同稀土总量的Sm、Gd共掺杂铝硼硅酸盐玻璃，以考察共掺杂对玻璃结构的影响。电子顺磁共振（ESR）谱数据表明，Gd ~（3+）离子的相对含量与Sm/Gd比值呈非线性关系。此外，共掺杂导致的EPR信号归因于辐照产生的缺陷的演变：超超精细结构的硼氧空穴中心EPR线变得不太明显，并解决随着Gd量的增加。这一事实表明，Gd 3+离子主要在硼网络附近被稀释。通过拉曼光谱，我们表明，由照射引起的结构变化也揭示了非线性行为与Sm/Gd的比例。事实上，Si-O-Si弯曲振动模式的位移有一个明确的最小值的样品含有等量的Sm和Gd（50：50）在两个系列的研究玻璃。相比之下，对于单掺杂玻璃，掺杂剂的含量对Si-O-Si位移（在Gd的情况下）或其减少（在Sm的情况下）没有影响，这可以通过还原过程的影响来解释。同时，共掺杂对Sm ~（3+）的发光强度、Sm ~（2+）的发光以及Sm的还原过程没有明显的影响。
英文摘要：
Two series of Sm-, Gd-codoped aluminoborosilicate glasses with different total rare earth content have been studied in order to examine the codoping effect on the structural modifications of beta-irradiated glasses. The data obtained by Electron Paramagnetic Resonance spectroscopy indicated that relative amount of Gd3+ ions located in network former position reveals non-linear dependence on Sm/Gd ratio. Besides, codoping leads to the evolution of the EPR signal attributed to defects created by irradiation: superhyperfine structure of boron oxygen hole centres EPR line becomes less noticeable and resolved with increase of Gd amount. This fact manifests that Gd3+ ions are mainly diluted in vicinity of the boron network. By Raman spectroscopy, we showed that the structural changes induced by the irradiation also reveal non-linear behaviour with Sm/Gd ratio. In fact, the shift of the Si-O-Si bending vibration modes has a clear minimum for the samples containing equal amount of Sm and Gd (50:50) in both series of the investigated glasses. In contrast, for single doped glass there is no influence of dopant's content on Si-O-Si shift (in case of Gd) or its diminution (in case of Sm) occurs which is explained by the reduction process influence. At the same time, no noticeable effect of codoping on Sm3+ intensity as well as on Sm2+ emission or on Sm reduction process was observed.
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