Abstract
The geometric and topological analysis of the crystal structure of (i) the Rh140Al403-cP549 intermetallide with cubic cell parameters a = 19.9350 Å, V = 7922.25 Å3, and the Pm-3 space group and (ii) the Mn18Pd138Al387-cP549 intermetallide with cubic cell parameters a = 20.211 Å and Pm-3 space group is conducted by the ToposPro program package. Two new cluster precursors with the symmetry -43m is established: the K244 = 0@12@20@80@132 four-layer cluster with an inner icosahedron Pd12 or Rh12 and the three-layer cluster K245 = 1@14@48@206 with an inner 15-atom polyhedron Al@Pd8Al6 or Al@Rh8Al6. The symmetric and topological code of self-assembly processes of 3D structures from K244 and K245 nanocluster precursors is reconstructed in the following form: primary chain → microlayer → microframework. MAl3 and M2Al2 (M = Rh or Pd) clusters bound by Al atoms were adjusted as spacers occupying voids in the 3D framework of the K242 and K245 nanoclusters.
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Funding
The nanocluster analysis was supported by the Russian Science Foundation (RSF no. 20-13-00054); the analysis of the self-assembly of the crystal structure was supported by the Ministry of Education and Science of the Russian Federation as part of a state order for the Federal Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences; and the topological analysis was supported by the Ministry of Education and Science of the Russian Federation as part of state order no. 0778-2020-0005.
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Translated by D. Marinin
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Shevchenko, V.Y., Blatov, V.A. & Il’yushin, G.D. Cluster Self-Organization of Intermetallic Systems: New Four-Layer Cluster Precursor K244 = 0@12@20@80@132 and New Three-Layer Cluster Precursor K245 = 1@14@48@206 in the Rh140Al403-cP549 and Mn18Pd138Al387-cP549 Crystal Structures. Glass Phys Chem 47, 1–12 (2021). https://doi.org/10.1134/S1087659621010107
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DOI: https://doi.org/10.1134/S1087659621010107