Abstract
A new study has been made of the well-known sodium borosilicate glass system to improve the overall and detailed understanding of both the atomic level structures in these glasses and the correlation of these structures to their physical properties. The specific intent is to examine the isocompositional, Na2O content, variation of the Na+-ion conductivity with the mixing ratio x of the amounts of B2O3 and 2SiO2 (Si2O4, which keeps the number of glass former cations constant across this series) in these glasses. This study deepens our ongoing examination of the mixed glass former effect (MGFE) on the Na+ ion conductivity in these glasses. In doing so, we also report and examine the MGFE on the density, the mechanical moduli, and the glass-transition temperature, Tg. The most significant structural change that occurs in these glasses is the formation of large fractions of tetrahedral borons, B4, that leads to densification and strengthening of the glass structure and, as a result, causes what appears to the...
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