在酸盐玻璃中的Nb2O5的结构作用:用于玻璃系统的高级固态NMR协议xNb2O5-{100-x) NaPO3
Laureano Ensuncho1, Henrik Bradtmüller1,2, Philip S Salmon3
1São Carlos Institute of Physics, University of São Paulo, IFSC─USP, 13566-590, São Carlos, SP, Brazil.
Journal of the American Chemical Society
|August 18, 2025
概括
氧化 (Nb2O5) 作为甲玻璃中的网络前体,增强连接性. 先进的固态核磁共振方法揭示了这些玻璃中的结构作用和局部环境.
科学领域:
- 材料科学
- 固态化学
- 光谱学
背景情况:
- 氧化物 (Nb2O5) 在氧化玻璃中的结构作用尚不清楚,这限制了其独特光学特性的利用.
- 先进的固态核磁共振 (NMR) 技术,特别是双极方法,提供了对原子连接和距离的定量见解,但对于含的玻璃没有充分利用.
研究的目的:
- 开发和应用一种新的NMR策略,以阐明Nb2O5在模型玻璃系统xNb2O5-(100-x) NaPO3中的结构作用.
- 量化确定P-O-P和P-O-Nb链接的数量,并描述协调环境.
主要方法:
- 采用先进的固态核磁共振技术,包括旋回回声衰变 (SED),双量子双极再合 (DQ-DRENAR),93Nb{31P}旋回回声双共振 (REDOR) 和31P{93Nb}旋回回声和脉冲双共振 (RESPDOR).
- 使用31P/23Na双共振光谱和现场依赖的93Nb MAS NMR实验.
- 基于选择性相互作用的NMR数据进行了定量分解,分辨率不佳的31P MAS NMR光谱.
主要成果:
- 使用各种二极核磁共振技术量化了P-O-P和P-O-Nb链接的数量.
- 通过93Nb MAS NMR识别了多个具有不同程度扭曲的六坐标环境.
- 证明Nb2O5作为网络前,增加了甲酸玻璃网络的整体连接性.
结论:
- 该研究成功建立了一个先进的固态NMR协议,用于描述Nb2O5在多组件玻璃中的结构作用.
- 纳入Nb2O5导致网络连接性增加,证实其在研究的玻璃系统中的网络前置作用.
- 开发的NMR策略为含玻璃的结构提供了宝贵的见解,对于优化其光学性能至关重要.
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