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DF: Fachverband Dielektrische Festkörper
DF 14: Dielectric composites and functionally graded materials; ceramics
DF 14.1: Vortrag
Donnerstag, 17. März 2011, 11:20–11:40, MÜL Elch
Dielectric properties of BaTiO3 composites below the percolation threshold due to finite size effects — •Hans Lustfeld1 and Martin Reißel2 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D52425 Jülich — 2Fachhochschule Aachen, Abteilung Jülich, D52428, Jülich
The high dielectric permittivity of BaTiO3 can be enhanced further by adding metallic nanoparticles, e.g. Ni[1,2] or Ag[3]. This enhancement becomes high near the concentration cp of the percolation threshold[4]. Therefore computing dielectric properties close to cp is of great interest. However, near this limit finite size effects become important for modern Multi Layer Ceramic Capacitors (MLCC’s) having a layer thickness of a few µ only. Here we discuss these effects for the dielectric permittivity, energy storage and conductivity using the brick layer model[5] and a modified brick-layer model.
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[2]Y-C. Huang et.al., J. Am. Ceram. Soc., 90, 1438 (2007)
[3]Y.Cheng et.al., Appl. Phys. Lett. 91, 252903 (2007)
[4]W.T. Doyle, J. Appl. Phys. 85, 2323 (1999)
[5]N.J. Kidner et.al., J. Am. Ceram. Soc. 91, 1733 (2008)