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Maxwell–Wagner–Sillars polarization
In dielectric spectroscopy, large frequency dependent contributions to the dielectric response, especially at low frequencies, may come from build-ups of charge.
This, so-called Maxwell–Wagner–Sillars polarization (or often just Maxwell-Wagner polarization), occurs either at inner dielectric boundary layers on a mesoscopic scale, or at the external electrode-sample interface on a macroscopic scale. In both cases this leads to a separation of charges (such as through a depletion layer). The charges are often separated over a considerable distance (relative to the atomic and molecular sizes), and the contribution to dielectric loss can therefore be orders of magnitude larger than the dielectric response due to molecular fluctuations.〔Kremer F., & Schönhals A. (eds.): Broadband Dielectric Spectroscopy. – Springer-Verlag, 2003, ISBN 978-3-540-43407-8.〕
== Occurrences ==
Maxwell-Wagner polarization processes should be taken into account during the investigation of inhomogeneous materials like suspensions or coloids, biological materials, phase separated polymers, blends, and crystalline or liquid crystalline polymers.〔Kremer F., & Schönhals A. (eds.): Broadband Dielectric Spectroscopy. – Springer-Verlag, 2003, ISBN 978-3-540-43407-8.〕
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