Abstract
The influence of external conditions on the characteristics of long-period structures (LPS) is considered: the temperature influence on the stabilization of the ordered structure with periodic antiphase boundaries is taken as an example. The study is carried out in terms of the phenomenological model which associates long-period phase formation with the cooperative behaviour of atoms in planes with different types of filling. A possibility is found to form a long-period phase in the temperature range in the vicinity of Tc. Calculations of the characteristics of the phase formed and the peculiarities of the X-ray diffraction patterns are made. The possibility to describe the formation and behaviour of a long-period ordered phase in terms of the same model is shown. [Russian Text Ignore]
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