The moment method is used to investigate the structure and stability of triple spatial dislocational points in hep crystals. It is shown that the moment method offers the possibility of more rigorous estimation of the conditions of occurrence of dislocational reactions than the Frank criterion. The "moment" criterion allows the region of guaranteed occurrence of dislocational reactions to be determined, i.e., the region of mutual orientations of the dislocations for which the occurrence of reactions between them is favorable.
Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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