Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Materials for Energy Storage I (joint session KFM/CPP)

KFM 14.6: Vortrag

Mittwoch, 14. März 2018, 11:40–12:00, EMH 025

Investigation of electrical conductivity and dielectric properties in ceramic-polymer composite films — •Till Mälzer^1,4, Tino Band², Sandra Wickert^3,5, Frank Apsel^1,5, Hartmut S. Leipner¹, Martin Diestelhorst², and Stefan Ebbinghaus³ — ¹Center of Materials Science, Martin-Luther-University Halle-Wittenberg (MLU), 06120 Halle (Saale) — ²Department of Physics, MLU — ³Department of Chemistry, MLU — ⁴enfas GmbH, 86668 Karlshuld — ⁵enspring GmbH, 06120 Halle (Saale)

Dielectric materials with high energy storage density are of great importance for power electronics. Ceramic-polymer composites have been evaluated as a candidate for dielectric materials for new-type capacitors, due to the possibility to tailor materials properties by proper design for specific applications. Besides dielectric properties in majority of studies, the electrical conduction of the ceramic-polymer composite films has been disregarded. We report on results of composite films consisting of the two ferroelectric materials P(VDF-HFP) as polymer matrix and BaTiO3 as filler, each known for its high permittivity in its particular material class. Composite films with different size and concentration of BaTiO3 particles were fabricated via a solution cast doctor blade method. We studied the influence of particle size, agglomeration, particle distribution and filler concentration on electrical conductivity and the dielectric properties energy density, permittivity and breakdown strength of the composite films. We used charge-voltage measurements for dielectric investigations and for morphological studies X-ray diffraction and scanning electron microscopy.