Low temperature viscosities of Na20.2(Ti02,Si02) glasses measured by penetration viscosimetry are presented for titania contents ranging from 0 to 40 mol%. The viscosity-temperature-composition relations are interpreted using Adam & Gibb's theory. The values of viscous flow activation energy and configuration entropy at Tg are discussed in connection with the structural information obtained in Mysen & Neuville's Raman spectroscopic study. The complex structural role of titania depending on both its content and glass temperature is confirmed by this study.
Origin
Slovak Academy Of Science, Slovakia
Journal Title
Phys Chem Glasses 38 1 1997 6-10
Sector
Special Glass
Class
S 1113