氧化硼和碱硼酸玻璃的11B核磁共振光谱和结构

S. Prabakar, K. Rao, C. Rao
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引用次数: 29

摘要

对氧化硼和碱硼酸玻璃进行了高分辨率11B魔角旋转(MAS)核磁共振研究。在10 mol. %的碱氧化物附近,三角硼的化学位移表现出异常行为。为了解释这种不寻常的特征,我们仔细检查了B2O3玻璃的结构模型。研究表明,大约66%的硼原子可能存在于硼砂单元中,其余的存在于松散的BO3/2单元中。该模型不仅与早期文献一致,而且表明在碱硼酸玻璃中,严格的拓扑化学因素参与了四硼酸盐和二硼酸盐单元的形成。B2O3玻璃化的显著趋势本身可能有结构原因,这似乎是合理的。
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11B NMR spectra and structure of boric oxide and alkali borate glasses
High-resolution 11B magic-angle-spinning (MAS) NMR investigations of boric oxide and alkali borate glasses have been carried out. The chemical shift of the trigonal boron shows anomalous behaviour around 10 mol. % alkali oxide. In an attempt to explain this unusual feature, we have carefully examined the structural model for B2O3 glass. The study suggests that around 66% of the boron atoms is likely to be present in the boroxol units, the rest being present in loose BO3/2 units. This model is not only consistent with the earlier literature but also shows that stringent topochemical factors are involved in the formation of the tetraborate and the diborate units in alkali borate glasses. It seems plausible that the remarkable tendency of B2O3 to vitrify may itself have a structural origin.
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