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Cluster Self-Organization of Intermetallic Systems: New Clusters-Precursors K3, K4, K6, and K11 for the Self-Assembly of Crystal Structures of the Li40P4Ge20-oP64 and Ti40P24-oP64 Families

  • V. Ya. Shevchenko,
  • G. D. Ilyushin

摘要

Abstract

Using computer methods (ToposPro software package), a combinatorial-topological analysis and modeling of the self-assembly of Li40P4Ge20-oP64 (V = 1082.85 Å3, Pnma) and Ti40P24-oP64 (V = 955.14 Å3, Pnma) crystalline structures is carried out. For the crystal structure of Li40P4Ge20-oP64, 36 variants of the identification of cluster structures with the number of clusters N = 2, 3, and 4 are established. The self-assembly of a crystal structure with the participation of clusters-precursors K11 = 0@11(Li5(LiGe5)) is considered in the form of pentagonal pyramids LiGe5 with five Li atoms located on five faces of the pyramid, rings K3 = @3(Li2P), and Li spacer atoms. For the crystal structure of Ti40P24-oP64, 55 variants of the identification of cluster structures with the number of clusters N = 2, 3, 4, and 6 are established. The self-assembly of a crystal structure involving clusters-precursors in the form of six-atom double tetrahedra, K6(4a) = 0@6(Ti4P2), K6(4b) = 0@6 (Ti4P2), three-atom rings K3 = 0@3(TiP2) and K3 = 0@3(Ti2P), and tetrahedrons K4 = 0@4 (Ti3P) is considered. The symmetric and topological code of the self-assembly processes of 3D Li40P4Ge20-oP64 and Ti40P24-oP64 structures from clusters-precursors is reconstructed in the following form: primary chain → layer → framework.