用Raman和EPR光谱作为探针研究锂取代钡钒酸盐玻璃的短程结构
A short-range structural insight into lithium substituted barium vanadate glasses using Raman and EPR spectroscopy as probes
摘要：
我们提出了一个确证性的研究锂取代钡钒酸盐玻璃的结构表征，使用拉曼光谱和电子顺磁共振（EPR）光谱。这些玻璃的热和物理性质的调查表明，非桥氧的浓度逐渐增加。拉曼和EPR分析使人们对玻璃结构的变化有了深入的了解。这两种光谱技术证实，钒是存在于玻璃中作为扭曲的VO6八面体。从这两种光谱技术的分析，它提出，锂离子更喜欢占据平面位置的VO6八面体，从而减少了四面体畸变，并使周围的环境在玻璃基质中的网络形成单元更均匀，因为我们增加锂含量。V4+的浓度表现出非单调的变化与增加Li2O所示的拉曼光谱研究和EPR证实，这表明在扭曲的VO6八面体的结构变化。
英文摘要：
We present a corroborative study of structural characterization of lithium substituted barium vanadate glasses using Raman and Electron Paramagnetic Resonance (EPR) spectroscopy. Investigation of the thermal and physical properties of these glasses showed a gradual increase in the concentration of non-bridging oxygen. Raman and EPR analysis gave an insight into the changing structure of the glasses. Both the spectroscopic techniques confirmed that vanadium is present in the glasses as distorted VO6 octahedra. From the analysis of both spectroscopic techniques, it is proposed that the lithium ion prefers to occupy planar positions of the VO6 octahedra thus reducing the tetragonal distortion and making the environment around the network forming unit in the glass matrix more homogenous as we increase lithium content. The concentration of V4+ showed a non-monotonic variation with an increase in Li2O as indicated by Raman studies and confirmed by EPR which indicates a structural change in the distorted VO6 octahedra.
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