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Molecular dynamics

Structure Evolution and Network Polymerization in Cao-SiO2-B2O3 Melts and Glasses: A Raman Spectroscopy and Molecular Dynamics Study

Strategic Insights

— 2 min read

Researchers from Shanghai University have conducted a comprehensive study on the ternary CaO-SiO2-B2O3 systems, delving into the microstructure of both molten and glassy states. By utilizing in situ high-temperature Raman spectroscopy, quantum chemistry ab initio calculation, and molecular dynamics (MD) simulation, the team aimed to elucidate the structural role of B2O3 in these systems. The research, funded by the Basic Strengthening Plan of the Commission of Science and Technology and the Special Fund Project of Shanghai Municipality for Science and Technology, has provided valuable insights into the structure modifications induced by B2O3.

Key Takeaways:

  • The deconvolution of Raman spectra revealed that B2O3 incorporation enhances network polymerization by increasing higher polymerized species while reducing lower polymerized species in both molten and glassy states.
  • Molecular dynamics (MD) results showed that B2O3 promotes the conversion of non-bridging oxygen to bridging oxygen, thereby enhancing network connectivity.
  • The study found that the weighted relative standard deviation between the experimental and MD simulation results lies within the acceptable range, indicating the accuracy and reliability of the conclusion.
  • The research provides a theoretical foundation for considering and developing fluoride-free mold fluxes with optimized thermal and mechanical properties for continuous casting processes.
  • The team used aerodynamic levitation to synthesize glass samples with varying B2O3 content (0-12 mol%) and basicity ratios (CaO/SiO2 = 1.0 and 1.25).
  • The study highlights the importance of B2O3 in modifying the structure of CaO-SiO2-B2O3 systems, which has significant implications for materials science and engineering applications.
  • The research has been peer-reviewed and published in the journal Ceramics International, Volume 51, Issue 24, 2025.

Statistics:

  • 12 mol% B2O3 content: This is the highest B2O3 content used in the study.
  • 1.25 basicity ratio: This is one of the two basicity ratios used in the study, along with a basicity ratio of 1.0.
  • 408 lines of text in the article: This study concludes that the deconvolution of Raman spectra revealed that B2O3 incorporation enhances network polymerization.
  • Raman spectroscopy: This technique was used in the study to investigate the microstructure of CaO-SiO2-B2O3 systems.
  • MD simulation: This simulation was used to model the behavior of the CaO-SiO2-B2O3 systems and provide insights into the structural role of B2O3.

Sources:

  • Structure Evolution and Network Polymerization In Cao-sio2-b2o3 Melts and Glasses: a Raman Spectroscopy and Molecular Dynamics Study. Ceramics International, 2025;51(24):40788-40798.
  • Elsevier Sci Ltd, 125 London Wall, London, England.
  • NewsRx LLC. Recent Research from Shanghai University Highlight Findings in Ceramics Research. October 21, 2025.

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