Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 45: Focus: Disorder Engineering as a Tool for Material Science

MA 45.3: Hauptvortrag

Donnerstag, 10. März 2016, 16:15–16:45, H32

Percolation and other models for quenched disorder in materials, and some consequences of this disorder on physical properties. — •Kurt Binder — Inst. of Physics, JGU Mainz

An introductory review of percolation phenomena in solids is given, starting out with the example of diluted ferromagnets, where the spontaneous magnetization vanishes at the percolation threshold already in the ground state. Extensions such as correlated percolation will be mentioned, from clusters in the Ising model to percolation of nanorods in the continuum, emphasizing to understand electrical conductivity. In sodium silicate glasses both the rigid silica network and a network of sodium-rich channels percolate simultaneously, and this feature explains the strong ionic conductivity of these materials.