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VOLUME 73 (2001) | ISSUE 5 | PAGE 274
Ginzburg - Landau-type theory of antiphase boundaries in polytwinned structures
PACS: 05.70.Fh, 61.50.Ks
Abstract
The conventional Landau - Ginzburg theory of interphase boundaries is generalized to the case of not small values of order parameters, with application to polytwinned structures characteristic of cubic-tetragonal-type phase transitions. Explicit expressions for the structure and energy of antiphase boundaries via the functions entering the free energy functional are given. A peculiar dependence of equilibrium orientations of antiphase boundaries on the interaction type is predicted, and it qualitatively agrees with available experimental data.