Distribution of Cs+ ions in single and mixed alkali silicate glasses from energy dispersive x-ray diffraction

The present study uses the energy dispersive X-ray diffraction (EDXD) technique to determine the average local distributions of Cs+ ions in silicate glasses with the compositions Cs2O·3.4 SiO2 and (0.405 Cs2O + 0.595 Na2O) · 3 SiO2. The data show that the local structure around Cs+ ions is very similar in the single and mixed alkali glasses, despite large differences in their ionicconductivities. No evidence of pairing or mixing of Cs+ and Na+ ions is seen, suggesting that the different ions may segregate submicroscopically into separate regions in the glass.