The structures of iron silicate glasses with varying iron redox ratios from molecular dynamics simulations and EXAFS analysis
The structures of iron silicate glasses with varying iron redox ratios from molecular dynamics simulations and EXAFS analysis
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根据分子动力学模拟和 EXAFS 分析得出具有不同铁氧化还原比的硅酸铁玻璃的结构
DOI:
10.1016/j.jnoncrysol.2023.122713
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发表时间:
2024
影响因子:
3.5
通讯作者:
Du, Jincheng
中科院分区:
文献类型:
--
作者:
Tuheen, Manzila I.;Wilkins, Malin C.Dixon;McCloy, John;Du, Jincheng
Iron oxides are frequently found in natural and industrial glass compositions and can affect various physical and chemical properties of the glasses and their melts. Thus, a fundamental understanding of iron-bearing silicate melts and glasses is of both scientific and technological importance. This study investigates the structures of sodium iron silicate glasses with compositions of NaFeSiO4, NaFeSi2O6, NaFeSi3O8, and Na5FeSi4O12using molecular dynamics simulations in combination with Extended X-ray Absorption Fine Structure (EXAFS) characterizations. Short and medium range structural features of these glasses support that ferrous (Fe2+) and ferric (Fe3+) ions play the roles of network modifier and network former, respectively, with the Fe oxidation states playing an important role in the polymerization of the glass network. These simulation results agree well with newly measured room temperature EXAFS spectra. The simulated glass structures were also compared to the melts structures with the same composition but different redox ratios. The average coordination numbers of the cations were found to be affected both by the melt temperature and iron redox ratio.
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