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Regensburg 2013 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 19: Poster 2

DF 19.22: Poster

Wednesday, March 13, 2013, 15:00–17:30, Poster B2

Characterisation of nonlinear capacitors as alternative energy storage — •Sebastian Lemm1, Wolfram Münchgesang1, Martin Diestelhorst1, Mandy Zenkner2, Thomas Großmann2, Claudia Ehrhardt2, Jens Glenneberg3, Alexandra Buchsteiner3, Horst Beige1, Stefan G. Ebbinghaus2, and Hartmut S. Leipner31Institute of Physics, Martin-Luther-University, D-06099 Halle, Germany — 2Institute of Chemistry, Martin-Luther-University, D-06099 Halle, Germany — 3Interdisciplinary Center of Materials Science , Martin-Luther-University, D-06099 Halle, Germany

The storage of energy requires the knowledge of the DC properties of the dielectric inside the capacitor. To characterise eligible materials like BaTiO3 for this special application we performed measurements under AC and DC conditions. As could be shown AC measurements are only of limited suitability to draw conclusions about the applicability of the materials. In the presentation we compare different measerement methods like DC charge-discharge measurements, low frequency measurements of the dielectric permittivity, and DC-conductivity which were performed on samples of different compositions like thin films of spin coated BaTiO3-polymer composites and BaTiO3-composites with anorganic matrix. Furthermore we tried to find correlations between the macroscopic dielectric properties and the microstructure of the materials investigating the materials by ESEM and TEM. It has been proven that a complicated interplay between many microscopic effects is responsible for the macroscopic dielectric properties.

The work was supported by BMBF within the project Superkon.

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