A STRUCTURAL MODEL OF TRANSITION OF CUBIC a-Mn INTO A HEXAGONAL MODIFICATION BASED ON NONCRYSTALLOGRAPHIC SYMMETRY OF CLUSTERSстатья
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Дата последнего поиска статьи во внешних источниках: 10 июля 2024 г.
Аннотация:A structural model of the transformation of cubic -Mn into high-pressure hexagonal close-packed -Mnphase is suggested. The model is based on the transformation of a triple of tetrahedrons into an octahedron,implemented through a shift of the diagonal of a nonplanar “rhombus” formed by the faces of neighboring tetrahedrons.A system of such transformations transfers a fragment of a tetrahedral -Mn spiral into a fragmentof a rod composed of octahedrons in hexagonal closest packing. The model takes into account thenoncrystallographic symmetry of the considered fragments of the crystalline phases.