An interstitialcy theory of structural relaxation and related viscous flow of glasses |
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Authors: | Granato A V Khonik V A |
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Institution: | Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Greet St., Urbana, Illinois 61801, USA. |
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Abstract: | A theory of isothermal structural relaxation and creep of glasses below the glass transition temperature is given. According to the interstitialcy theory, the supercooled liquid state does not exist below a Kauzmann "pseudocritical" temperature T(k), which lies above the temperature T(K), commonly called the "Kauzmann temperature." Structural relaxation is simply a reduction with time of the interstitialcy concentration to the crystalline state for TT(k). The predicted viscosity eta is universal, given by eta=eta(0) + eta(T)t, in agreement with experiment. eta is continuous in T, with eta discontinuous at T(k) but linear in 1/T above and below T(k). The dependence of eta on the shear modulus directly connects kinetic and thermodynamic properties of glasses and liquids. |
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