期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 589, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2022.121660
关键词
Lead borate glasses; Raman; NMR; Structure; Ionic; Covalent
资金
- US NSF [DMR-1746230]
- project National Infrastructure in Nanotechnology, Advanced Materials and Micro -/ Nanoelectronics [MIS 5002772]
- Operational Programme Competitiveness, Entrepre-neurship and Innovation [NSRF 2014-2020]
- Greece
- European Union
This study investigates the multi-spectroscopic properties of glasses with varying composition xPbO-(100-x)B2O3, and reveals the different bonding characteristics between lead and oxygen at different compositions, which play a crucial role in the structural evolution of the material.
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.
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