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DF: Fachverband Dielektrische Festkörper

DF 4: Internal Symposium “Order/Disorder versus/with Displacive Behaviour”

DF 4.1: Hauptvortrag

Dienstag, 27. März 2007, 10:00–10:40, H11

Intrinsically Heterogeneous Ferroelectrics: Origins and Consequences — •A. R. Bishop — Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

We describe expectations of intrinsic heterogeneity and coexistence of phases in some classes of ferroelectric materials. Understanding such behavior is essential to rationalize and motivate experiments, and to optimize materials for applications. We emphasize ferroelectrics as highly anisotropic, polarizable materials. We suggest modeling approaches based on coexisting anisotropic short- and long-range interactions arising from the coupling of spin, charge and lattice (strain) in multi-orbital situations, and the sympathetic proximity of solid-solid structural phase transitions with extended multiscale precursor regimes of twinning, tweed,etc.