Viscosity-temperature relationship of glasses with low melting points obtained by wide-range measurement(<Feature>Fracture and Related Phenomena of Glasses)

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The viscosity-temperature relationships for metaphosphate glass and polystyrene in the wide-temperature range, including below the glass transition temperature T_g, obtained by us, were analyzed using the Adam-Gibbs theory. The results showed that the glass transition is a non-equilibrium phase transition from the Vogel-Tammann-Fulcher (VTF) state to the Arrhenius state occurring at T_g. The Arrhenius curves below T_g show different slopes with varying activation energies owing to the fictive temperatures T_f characterizing the structural states of the glasses. To explain this result from the microscopic viewpoint, a model of an intermediate range order (IRO) is proposed. We also propose that the glass transition is due to a self-organization of the IROs, a few nanometers in size, in the glass state.
社団法人日本セラミックス協会の論文
2008-08-01