Complex impedance
Characterization of polymers by dielectric spectroscopy
Quizzed article REF: AM3141 V1
Complex impedance
Characterization of polymers by dielectric spectroscopy

Authors : Olivier GALLOT-LAVALLEE, Patrice GONON

Publication date: October 10, 2016, Review date: October 1, 2020 | Lire en français

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1. Complex impedance

The function of a dielectric is to store and isolate "two electricities" . As this function is never perfect, the dielectric is generally represented by a complex impedance Z_ . This representation makes it possible to account for the phase shift of the voltage with respect to the current noted φ and its complement δ to arrive at the phase shift of a perfect dielectric: π/2 = δ-φ (figure

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