Na2O-K2O-SiO2 系ガラスにおける混合アルカリ効果の考察

The mechanism of the mixed alkali effect of 0.25{xK2O-(1−x) Na2O}-0.75SiO2 glasses was studied by using the molecular dynamics (MD) simulation. MD simulations of this work reproduced the mixed alkali effect. In addition, the tendency of molar volume with temperature change by this work was reproduce...

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Bibliographic Details
Published in:Journal of Computer Chemistry, Japan Japan, 2017, Vol.16(4), pp.98-101
Main Authors: 山本, 優也, 澤口, 直哉, 佐々木, 眞
Format: Article
Language:Japanese
Subjects:
Alkali metals
Mechanism
Metal ions
Mixed alkali effect
Molar volume
Molecular dynamics
Molecular dynamics simulation
Self-diffusion
Silicate glass
Silicon dioxide
Simulation
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Summary:The mechanism of the mixed alkali effect of 0.25{xK2O-(1−x) Na2O}-0.75SiO2 glasses was studied by using the molecular dynamics (MD) simulation. MD simulations of this work reproduced the mixed alkali effect. In addition, the tendency of molar volume with temperature change by this work was reproduced in the experimental tendency. The mixing of alkali was independent to the network structure of Si and O. The free volume in the glass systems indicated that high condensed packing occurred by alkali mixing. The results of 39K133KSi3O7 glass showed that the mass difference from one alkali metal ion decreased the diffusion of the other alkali metal ion. The mixed alkali effect was considered to relate to both the size- and the mass-differences of the coexisting alkali metal ions.
ISSN:1347-1767
1347-3824
DOI:10.2477/jccj.2017-0032