Segregations at antiphase boundaries in hexagonal close-packed superstructures. II

As was shown in the first part of this study 1], slip occurs in polycrystalline ordered Mg₃Cd, which has a DO₁₉ superstructure, along the {0001} basis planes, {1010} prismatic planes, and {1011} and {1012} pyramidal planes 2,3]. The formation of segregations at antiphase boundaries (APB's) in the {0001} basis and {1011} pyramidal planes was also examined there 1]. Segregations at APB's in planes are treated in this second part of the study. A zero-energy APB may form in the prismatic plane 4]. Segregation of atoms, on the other hand, is not allowed at such an APB according to the Gorskii-Bragg-Williams theory if correlation and interaction in the second and higher coordination spheres are not taken into account.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, Vol. 12, No. 5, pp. 62–70, May, 1969.The authors thank N. S. Golosov and N. V. Kozhemyakin for discussion of this study and valuable advice.