Microscopic mechanism of viscosity in oxide glass melts and its control

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K05089
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Kyoto University
• Principal Investigator: Shimizu Masahiro 京都大学, 工学研究科, 助教 (60704757)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 酸化物ガラス / 粘度 / 動的物性 / 分子動力学計算

Outline of Final Research Achievements

By using molecular dynamics simulation, we elucidated that the dominant factor of viscosity in silicate melt is the stability of five-coordinated silicon during chemical reaction. As decreasing the distance between alkali and five coordinated Si, the stability of SiO5 increases and the reaction frequency increases. This is consistent with the fact that the reaction frequency of Na2O-SiO2 system is more than that of K2O-SiO2 system. In the case of mixed alkali system, the Na often exist near the SiO5 intermediate than K, which is the origin of mixed alkali effect.

Free Research Field

ガラス科学

Academic Significance and Societal Importance of the Research Achievements

実用ガラスにおける最重要物性の一つである粘度を支配する因子を明らかにした。これは組成によって粘度を制御する基礎となり、広範な応用につながる。特に、粘度の混合アルカリ効果の起源の一部を明らかにできたのは、学術的意義が大きいと考える。