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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: Glasses and Glass Transition II (jointly with DY and DF)

CPP 39.7: Vortrag

Donnerstag, 25. März 2010, 11:15–11:30, H38

The influence of the method of glass preparation and ambient conditions on diffusion of alkaline-earth ions in mixed cation glasses — •Michael Grofmeier and Hartmut Bracht — Institut für Materialphysik, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Str. 10, 48149 Münster

Diffusion of alkaline-earth ions in mixed alkali (A) alkaline-earth (M) glasses of the composition xA2O*(3-x)MO*4SiO2 with 0<x<3 was investigated by means of the radiotracer diffusion technique below the respective glass transition temperatures. Our previous studies reveal a distinct dependence of the diffusion behavior of the alkaline-earth ions on the composition x and type of cations in the glass. Additional experiments on the alkaline-earth ions mobility in sol-gel derived glasses of the same composition were performed in this work in order to determine whether the mixed cation effect in alkali-alkaline-earth silicate glasses also holds for sol-gel derived thin glass films. We found that the diffusion behavior of cations in mixed cation silicate glasses is independent of the way of glass preparation. Further diffusion measurements under reducing atmosphere demonstrate a retarded mobility of the alkaline-earth cations.