Abstract
The occurrence of annealing pre-peaks, or sub- T g peaks, has been investigated by differential scanning calorimetry in silver iodomolybdate glasses and in mixed silver iodotungstatomolybdate glasses. It is demonstrated that these pre-peaks can be made to occur in any of these systems, provided that the appropriate experimental conditions, namely, a rapid quench followed by annealing at a temperature that is low but not too far below T g, are used. Further, these peaks are simply precursors of the annealing ‘overshoot’, which is distinct from the ‘upper’ peak observed in ‘intrinsic cycles’ in glasses characterised by a narrow distribution of structural relaxation times. Contrary to some other authors' suggestions, a broad distribution of such relaxation times (i.e., a small value of the non-exponentially parameter, β) is neither a pre-requisite nor particularly conductive to the appearance of the pre-peaks.
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