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Dielectric relaxation in solids

1999; Institute of Physics; Volume: 32; Issue: 14 Linguagem: Inglês

10.1088/0022-3727/32/14/201

1361-6463

A.K. Jonscher,

Glass properties and applications

This review presents a wide-ranging broad-brush picture of dielectric relaxation in solids, making use of the existence of a `universality' of dielectric response regardless of a wide diversity of materials and structures, with dipolar as well as charge-carrier polarization. The review of the experimental evidence includes extreme examples of highly conducting materials showing strongly dispersive behaviour, low-loss materials with a `flat', frequency-independent susceptibility, dipolar loss peaks etc. The surprising conclusion is that despite the evident complexity of the relaxation processes certain very simple relations prevail and this leads to a better insight into the nature of these processes.