Comments on dielectric properties of semiconducting iron phosphate glasses
1979; Elsevier BV; Volume: 33; Issue: 3 Linguagem: Inglês
10.1016/0022-3093(79)90106-6
ISSN1873-4812
AutoresI. Thurzo, J. Doupovec, J. Kákoš,
Tópico(s)Theoretical and Computational Physics
ResumoThe thermally stimulated depolarization (TSD) method is used to investigate dielectric behavior in FeOxP2O5 glasses with artio α = Fe3+/(Fe3+ + Fe2+) ranging from 0.11 to 0.88. Apart from a space charge polarization a Debye-type dielectric relaxation is found in each of the compositions investigated. The permitivity dispersion ϵS - ϵ∞ related to the latter polarization decreases monotonically with increasing α. Such a behavior is incompatible with either of the known theoretical approaches based primarily on two-site hopping models. In view of this finding the dielectric relaxation is assigned to a Maxwell-Wagner effect resulting from microscopical heterogeneities rather than to the hopping of electrons between ferrous and ferric sites.
Referência(s)