Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 19: Poster 2

DF 19.22: Poster

Mittwoch, 13. März 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. Leipner³ — ¹Institute 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.