The Brillouin light scattering technique was used to study short time relaxations in glass forming oxide melts. The line shape analysis of Brillouin spectra yields a complex mechanical modulus. The temperature dependence of this modulus provides insight into the structural disintegration above the glass transition, as well as the thermally activated mechanisms which facilitate the momentum transport in the process of viscous dissipation. A series of binary and ternary alkali borates and alkali silicates have been investigated. The results show fundamental differences in the way alkali cations affect the network structure in borates as compared to silicates. While these cations move relatively freely within the rigid silicate network, their motions are strongly coupled to the network relaxation in borates. The activation energies for cation motion are in good agreement with those found by other methods.
|Title of host publication
|Crystallization and Related Phenomena in Amorphous Materials
|Matthew Libera, Tony E. Haynes, Peggy Cebe, James E. Dickinson Jr.
|Publ by Materials Research Society
|Number of pages
|Published - 1994
|Proceedings of the 1993 Fall Meeting of the Materials Research Society - Boston, MA, USA
Duration: Nov 29 1993 → Dec 3 1993
|Proceedings of the 1993 Fall Meeting of the Materials Research Society
|Boston, MA, USA
|11/29/93 → 12/3/93
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials