Dresden 2011 – wissenschaftliches Programm

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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 c_p of the percolation threshold[4]. Therefore computing dielectric properties close to c_p 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.

[1] C. Pithan et.al., Int. J. Mater. Res. 97, 5 (2006)

[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)