Author： Kirichenko E. V. Sobolewska A. Stephanovich V. A.
Publisher： Taylor & Francis Ltd
ISSN： 0015-0193
Source： Ferroelectrics, Vol.288, Iss.1, 2003-01, pp. : 211-219
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Abstract
We calculate the structure of 180° domain wall in disordered ferroelectrics with random site electric dipoles (i.e. those like K1 − xLixTaO3, KTa1 − xNbxO3). The calculation is performed on the basis of a free energy functional of disordered dielectrics derived by us earlier [2] within the framework of a random local 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 ferroelectric the domain wall is usually broader that in their ordered counterparts; the thickness increases infinitely near phase transition temperature and critical concentration of dipoles.
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