Regensburg 2019 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Focus: Materials for Energy Storage

KFM 9.3: Talk

Tuesday, April 2, 2019, 10:20–10:40, PHY 5.0.21

Influence of the morphology on the electrical conductivity of ceramic-polymer composite dielectrics — •Till Mälzer^1,3, Tino Band², Marius Falkenstein², Robert Schlegel³, Martin Diestelhorst², Stefan Ebbinghaus⁴, and Hartmut S. Leipner¹ — ¹Center of Materials Science, Martin-Luther-University Halle-Wittenberg (MLU), D06120 Halle (Saale) — ²Department of Physics, MLU — ³enspring GmbH, D06120 Halle (Saale) — ⁴Department of Chemistry, MLU

Ceramic-polymer composites have been evaluated as a candidate for dielectric materials for a new type of capacitors, due to the possibility to tailor materials properties by proper design for specific applications. By rising the content of high-k ceramic filler, the energy density of composite materials can be increased. However, it causes also an increase in the electrical conductivity, a fact which has been disregarded in many studies.

We report on the influence of morphological aspects like particle size, particle distribution, agglomerate structure and percolating agglomerates on the electrical conductivity of the composite. The investigated material system consists of P(VDF-HFP) as polymer matrix and BaTiO3 or TiO2 as filler. Composite films with a variation of the particle size and the concentration of the filler, as well as different film thicknesses have been fabricated via a solution cast doctor blade method. We have applied charge-voltage measurements for electrical investigations and for morphological studies scanning electron microscopy and 3D X-ray microscopy.