Divergence of dielectric permittivity near phase transition within ferroelectric domain boundaries

0396760 - FZÚ 2014 RIV GB eng J - Článek v odborném periodiku
Márton, Pavel - Stepkova, Vilgelmina - Hlinka, Jiří
Divergence of dielectric permittivity near phase transition within ferroelectric domain boundaries.
Phase Transitions. Roč. 86, č. 1 (2013), s. 103-108. ISSN 0141-1594. E-ISSN 1029-0338
Grant CEP: GA ČR GAP204/10/0616
Institucionální podpora: RVO:68378271
Klíčová slova: Bloch wall * domain boundary * BaTiO₃ * Ginzburg-Landau-Devonshire theory * permittivity
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.044, rok: 2013

Phase-field simulations based on Ginzburg-Landau-Devonshire model were utilised to demonstrate and quantify the enhancement of the dielectric permittivity of multidomain rhombohedral BaTiO3 crystal in the vicinity of the Bloch-type to Ising-type phase transition within 180° domain boundaries with {211} crystallographic orientation. The phase transition is driven by compressive mechanical stress applied in the plane perpendicular to the spontaneous polarisation direction. Simulations reveal a classical Curie-Weiss behaviour of the transverse component of dielectric permittivity, expected in the vicinity of a second-order phase transition.
Trvalý link: http://hdl.handle.net/11104/0224475