Regensburg 2007 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 1: Tutorial “Basics of Dielectric Solids”

DF 1.1: Tutorium

Sonntag, 25. März 2007, 14:00–15:00, H11

Fundamentals of dielectric solids — •Horst Beige — Martin-Luther-Universität Halle-Wittenberg, Institut für Physik, Physik ferroischer Materialien, Friedemann-Bach-Platz 6, 06108 Halle/S.

Dielectric solids have received increasing attention in recent years, both from a fundamental perspective and from a novel applications viewpoint. There are three major trends which led to this emphasis.

One trend concerns the fact that advanced functional components are made of material systems rather than of discrete materials. Material integration issues play an increasing important role driven by the interest in integrating functions of dielectric solids into conventional semiconductor chips as well as for the evolution of multifunctional components and systems.

A second trend is the scaling of the structure size into the sub 100nm regime.

A third trend concerns the role of theory and modeling. The materials and device design are more and more accompanied and guided by modeling, e.g. by thermodynamics, finite-element methods, and ab-initio calculations.

This lecture gives an introduction to basic principles of symmetry classification, dielectric polarization, elastic, dielectric and electromechanical properties. The Landau-Ginzburg-Devonshire theory and the soft mode concept for the phase transition from an unpolar to a polar phase are also topics of this paper.