Goel Parul, Honnavar Gajanan V
Department of Physics, St. Joseph's College, 36, Lalbagh Road, Bangalore 560027, India.
Department of Science and Humanities, PES Institute of Technology, Bangalore South Campus, Affiliated to VTU Belagavi, Hosur Road, Near Electronic City, Bangalore 560100, India.
ACS Omega. 2021 Aug 16;6(34):22454-22461. doi: 10.1021/acsomega.1c03544. eCollection 2021 Aug 31.
We present a corroborative study of the 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 nonbridging 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 VO octahedra. From the analysis of both spectroscopic techniques, it is proposed that the lithium ion prefers to occupy planar positions of the VO octahedra, thus reducing the tetragonal distortion and making the environment around the network-forming unit in the glass matrix more homogeneous as we increase the lithium content. The concentration of V showed a non-monotonic variation with an increase in LiO as indicated by Raman studies and confirmed by EPR, which indicates a structural change in the distorted VO octahedra.
我们展示了一项关于使用拉曼光谱和电子顺磁共振（EPR）光谱对锂取代钒酸钡玻璃进行结构表征的佐证性研究。对这些玻璃的热学和物理性质的研究表明非桥氧浓度逐渐增加。拉曼光谱和EPR分析深入了解了玻璃结构的变化。两种光谱技术均证实钒在玻璃中以畸变的VO八面体形式存在。通过对两种光谱技术的分析，提出锂离子倾向于占据VO八面体的平面位置，从而减少四方畸变，并随着锂含量的增加使玻璃基质中网络形成单元周围的环境更加均匀。如拉曼研究所示并经EPR证实，随着LiO增加，V的浓度呈现非单调变化，这表明畸变的VO八面体结构发生了变化。
