Mixed-Alkali Effect On Rayleigh Scattering In K20-Na20-Mg0-Si02 Glasses

The Rayleigh scattering of the mixed-alkali glass sytem K20-Na20-Mg0-Si02 (KNMS) was investigated, both experimentally and theoretically. The lowest Rayleigh scattering coefficient (38% of that for pure Si02 glass) was obtained when the glass composition was 22K20-8Na20-10Mg0-60Si02 (in mol%). These values are equal to or less than the minimum values reported for the ternary sodium silicate glass Na20-Mg0-Si02. The Rayleigh scattering caused by concentration fluctuation was believed to have been reduced greatly in this KNMS glass, because the mobility of the alkali-metal ions was reduced by the mixed-alkali effect.