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Properties of ferroelectric domain walls corresponding to rotations of the spontaneous electric polarization by 90 or 180 degrees are investigated in the framework of material-specific generalized Ginzburg-Landau-Devonshire model involving long-range dipole-dipole interactions. Thickness and surface energy for these domain walls in the tetragonal and the orthorhombic phases of BaTiO3 are evaluated in the charge-free approximation using model parameters determined from independent experiments. Both types of domain walls occur spontaneously in domain pattern simulations, although in the orthorhombic phase the 180-degree domain walls are very rare. The simulated domain patterns and domain wall properties are discussed and the relation to the pronounced anisotropy of the gradient term is pointed out.
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Keywords: BaTiO3; Ferroelectric and ferroelastic domains; Ginzburg-Landau theory

Document Type: Research Article

Affiliations: Institute of Physics, Academy of Sciences of the Czech Republic, Praha 8, Czech Republic

Publication date: 2008-01-01

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