Structure of lead borate glasses by Raman, 11B MAS, and 207Pb NMR spectroscopies
Structure of lead borate glasses by Raman, 11B MAS, and 207Pb NMR spectroscopies
复制标题
DOI：
10.1016/j.jnoncrysol.2022.121660
复制
发表时间：
2022-05-02
影响因子：
3.5
通讯作者：
Feller, Steve
中科院分区：
文献类型：
--
作者：
Chatzipanagis, Konstantinos I.;Tagiara, Nagia S.;Feller, Steve
用拉曼光谱、~(207)Pb静态核磁共振和~(11)B MAS核磁共振谱对xPbO-(100-x)B_2O_3玻璃进行了多光谱研究。拉曼结果被量化，并与定量的核磁共振结果相结合，产生了一个相干的结构模型。四配位硼(N4)的最大值在x=50附近，而碱改性硼酸盐的最大值在x=35-40附近。在x=30-50范围内，核磁共振和拉曼光谱都表明铅离子的离子行为更强。从x=50-65，光谱结果表明铅-氧键的性质从离子转变为共价。在相似的组成下，与碱性硼酸盐相比，硼酸盐网络变得更具离子性，同时保持未充分修饰；这与铅-氧键对结构演变的重要性是一致的。当x>；65时，铅-氧键变得显著共价。
A multi-spectroscopic investigation of glasses xPbO-(100-x)B2O3, where 30 < x < 80, was undertaken employing Raman, 207Pb static NMR, and 11B MAS NMR spectroscopies. The Raman results were quantified and combined with quantitative NMR results to produce a coherent structural model. The fraction of four-coordinated borons (N4) has a maximum near x = 50, in contrast with alkali modified borates where the maximum is near x = 35-40. In the range x = 30-50, both NMR and Raman spectroscopies indicate that lead ion behaves more ionically. From x = 50-65, the spectroscopic results indicate a change in the lead-oxygen bonding character from ionic to covalent. At similar compositions, the borate network becomes more ionic while remaining under-modified compared to alkali borates; consistent with lead-oxygen bonding being important to the structural evolution. When x > 65, the lead-oxygen bonding becomes significantly covalent.