Glass Relaxation Kinetics. Dynamic Activation Energy Assumption.
NAVAL RESEARCH LAB WASHINGTON D C
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The assumption was made that the activation energy of a relaxation process chan change slightly 4 as the system relaxes. The empirical consequences of such an assumption are as follows the normally exponential decay function becomes more gradual or broadened in precisely the manner observed for glass and polymer relaxations the well-known fractional-exponential expression for the response function is easily obtained a well-defined temperature dependence is predicted for the width parameter b, which is in excellent agreement with recent measurements on B2O3 glass and conventional finite-amplitude nonlinear correction terms can be introduced in a more unified manner than was previously possible. A simple physical justification for this time-dependent activation energy is that the structural units that relax later encounter a somewhat larger activation barrier than do the units that relax first. Author
- Ceramics, Refractories and Glass