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Experimental Physics III - Team Prof. Suter

Dielektric Spectroscopy

Dielectric Spectroscopy is used to detect charge carrier transport (electrons, ions) or local charge fluctuations. The stimulus is the applied electric field E. The sample reacts to this field with a polarisation P. In the case of small field strength (linear response) the polarisation depends on the electric field via P  =  c  eps0  E. c is called the the complex susceptibility of the sample and contains the desired information. The method can be described by the network shown in the sketch. Quantities of interest, e.g. susceptibility or electrical conductivity can then be determined. Due to the little experimental effort required for dielectric spectroscopy it is a commonly used technique. At E3 dielectric spectroscopy is used a supporting measurement method and is currently utilised to observe diffusion of ions in low conducting ion glasses and glass ceramics.