期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 592, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2022.121751
关键词
Lead borate glass; Reverse Monte Carlo modeling; Bond valence sum; Coordination polyhedron
资金
- Agency for Natural Resources and Energy
- Ministry of Economy, Trade and Industry (METI) [JPJ007597]
A structural model of 66.7PbO-33.3B2O3 glass was constructed using a reverse Monte Carlo method with bond valence sum as a constraint condition. The analysis revealed that the PbOn units in the glass model had less asymmetry and a different network structure compared to crystals with the same composition.
The structural model of 66.7PbO-33.3B2O3 glass was constructed using a reverse Monte Carlo (RMC) method, in which bond valence sum (BVS) was added as a constraint condition to suppress formation of unrealistic local structures. Based on the crystal structures, the optimal BVS calculating conditions were determined. As a result, BVS distributions with small deviation were successfully achieved without lowering the reproducibility of other experimental constraints. The geometric asymmetry of PbOn polyhedra was evaluated from the eccentric dis-tance between Pb and gravity center of oxygen atoms. The average eccentric distance was shorter than that in the lead borate crystals, indicating less asymmetry of PbOn units in the RMC glass model. The connectivity between BOn and PbOn units was investigated. It was consequently concluded that the glass had a different network structure from the crystal with the same composition, which might be due to the different chemical bonding character between the lead borate glasses and crystals.
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