Abstract
The thermally stimulated depolarization current (TSDC) method was used to study relaxation phenomena of low symmetry complexes in CaF 2:Gd 3+ crystals. During successive TSDC scans under exactly the same experimental conditions the shape of certain peaks was observed to change in a manner indicating conversions of tetragonal (type I) to trigonal (type II) Gd 3+-F i − complexes. In a first attempt to interpret the phenomenon, the transformation of type I to type II dipoles, which are considered as two distinctive configurations of the Gd 3+-F i − structure, is tentatively ascribed to the influence of the applied external electric field in the relaxation processes involved.
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