Dresden 2014 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 9: Poster Session DF

DF 9.12: Poster

Tuesday, April 1, 2014, 18:30–20:00, P1

Influence of leakage current in BaTiO₃-capacitors on stored energy — •Tino Band¹, Martin Diestelhorst¹, Sebastian Lemm¹, Mandy Zenkner², and Albrecht Rost³ — ¹Institute of Physics, Martin-Luther-University Halle-Wittenberg, D-06099 Halle, Germany — ²Institute of Chemistry, Martin-Luther-University Halle-Wittenberg, D-06099 Halle, Germany — ³University of Applied Sciences Merseburg, 06217 Merseburg, Germany

The development of dielectric energy storage is of prime importance. Our investigations are motivated by the expectation to realize higher power densities and much more load/reload cycles compared to electrochemical energy storages. Up to now the high energy densities of electrochemical storage batteries could not be achieved by dielectric materials. Therefore the aim is to raise the energy density of capacitors by finding dielectrics with high permittivities ε. At first glance ferroelectrics fulfil these requirements, because of their relatively high values of ε. We use modified BaTiO₃ ceramic capacitors for our research. It is well known that ceramic capacitors show a non negligible leakage current. Based on the equivalent circuit of real capacitors we discuss the influence of leakage currents on hysteresis measurements and the stored energy. As a result we present comparisons of our calculation and compensated hysteresis measurements.