6533b7d0fe1ef96bd125b628
RESEARCH PRODUCT
The behavior of the 180° domain walls in disordered dielectrics like KTaO3 : Li and KTaO3 : Nb
Aneta SobolewskaVladimir A. Stephanovichsubject
Electric dipole momentDipoleDomain wall (magnetism)Condensed matter physicsChemistryImpurityPhase (matter)DielectricCondensed Matter PhysicsFerroelectricityElectronic Optical and Magnetic MaterialsIondescription
We calculate the structure of 180° domain wall in disordered ferroelectrics with random site electric dipoles (i.e. those like K 1-x Li x TaO 3 , KTa 1-x Nb x O 3 , where Li + or Nb 5+ are off-center ions forming impurity dipoles). The calculation is performed on the base of the free energy functional of disordered dielectrics derived earlier [M. D. Glinchuk et al., Phase Transit., 2003 (to be published)] within the framework of a random field method. We obtain the domain wall thickness as a function of impurity dipole concentration n and temperature T. It is shown that in disordered ferroelectrics the domain wall is usually broader than in their ordered counterparts. The thickness increases infinitely near the phase transition temperature, which depends on the impurity dipoles concentration.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-04-01 | physica status solidi (b) |