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Simulation of polycrystalline ferroelectrics based on discrete orientation distribution functions
Author(s) -
Kurzhöfer Ingo,
Schröder Jörg,
Romanowski Holger
Publication year - 2005
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200510130
Subject(s) - ferroelectricity , homogenization (climate) , polarization (electrochemistry) , crystallite , transverse isotropy , dielectric , materials science , condensed matter physics , electric field , isotropy , distribution function , hysteresis , physics , statistical physics , optics , chemistry , optoelectronics , quantum mechanics , biodiversity , ecology , metallurgy , biology
Ferroelectric materials exhibit a spontaneous polarization, which can be reversed by an applied electric field of sufficient magnitude. The resulting nonlinearities are expressed by characteristic dielectric and butterfly hysteresis loops. These effects are correlated to the structure of the crystal and especially to the axis of spontaneous polarization in case of single crystals. We start with a representative meso scale, where the domains consist of unit cells with equal spontaneous polarization. Each domain is modeled within a coordinate invariant formulation for an assumed transversely isotropic material as presented in [10], in this context see also [8]. In this investigation we obtain the macroscopic polycrystalline quantities via a simple homogenization procedure, where discrete orientation distribution functions are used to approximate the different domains. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)