The structural role of V in 28Li₂O–72SiO₂ (in mol%) lithium silicate glass doped with 0.5 mol% V₂O₅ was assessed using ²⁹Si and ⁵¹V Nuclear Magnetic Resonance (NMR), Fourier‐transform infrared (FTIR), and X‐ray photoelectron (XPS) spectroscopy techniques. Despite the low amount of V₂O₅ used, the structural information obtained or deduced from the statistical analysis of the NMR data could explain the evolution of glass properties after V₂O₅ addition. The XPS results indicated that all vanadium exists in 5+ oxidation state. Both the ²⁹Si NMR and FTIR data point toward an increase in the polymerization of the silicate network, caused by the V₂O₅ acting as network former, capable to form various tetrahedral units (for n = 0, 1, and 2) in the glasses. These units, which are similar to phosphate units, scavenge the Li⁺ ions and cause the silicate network to polymerize. However, in an overall balance, the entire glass network is depolymerized due to the additional nonbridging oxygens contributed by the vanadium polyhedra. The addition of vanadium causes the network to expand and increases the ionic conductivity.

中文翻译：

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钒氧化物对硅酸锂玻璃结构和性能的作用

使用²⁹ Si和⁵¹ V核磁共振（NMR），傅立叶变换红外光谱（FTIR）评估了V在掺杂有0.5 mol％V ₂ O _5的28Li ₂ O–72SiO ₂（mol％）硅酸锂玻璃中的结构作用。）和X射线光电子（XPS）光谱技术。尽管使用的V ₂ O ₅量很低，但从NMR数据的统计分析获得或推导的结构信息仍可以解释添加V ₂ O ₅后玻璃性能的演变。XPS结果表明，所有钒均以5+氧化态存在。两者都²⁹Si NMR和FTIR数据表明，由于V ₂ O ₅作为网络形成剂，能够 在玻璃中形成各种四面体单元（n = 0、1和2），导致硅酸盐网络的聚合反应增加。这些与磷酸盐单元相似的单元清除了Li ⁺离子，并使硅酸盐网络聚合。然而，总的来说，由于钒多面体贡献了额外的非桥连氧，因此整个玻璃网络都发生了解聚。钒的添加导致网络扩展并增加离子电导率。