Abstract
Property changes of amorphous samples during annealing--enthalpy, elastic constants, resistivity and magnetic anisotropy--reveal that besides irreversible structural relaxation below the glass transition temperature there are reversible structural changes brought about by thermal, magnetic or mechanical effects. The kinetics of these structural changes suggest that more than one relaxation mechanism is present. In order to get clear evidence of a relaxation spectrum, many crossover experiments have been performed studying properties such as Young`s modulus, Curie temperature, viscosity, resistivity, induced anisotropy and magnetic after-effect. The existence of a crossover effect in a property change during reversible structural ordering means that there is neither a single relaxation process nor a single ordering parameter. In this work, the presence of relaxation spectrum in isothermal creep recovery has been demonstrated by observing a crossover effect. Non-isothermal annealing was used to complement earlier isothermal results.
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