Silicon ternary borides

Krypyakevych (1977) has proposed the systematics of structure types of intermetallic and related compounds based on the analysis of the coordination polyhedra of the smallest atom. This author distinguishes 17 groups to which the coordination polyhedra of the smallest atoms belong. In analyzing the crystal structures of intermetallic compounds some problems, connected with choice of the smallest atom, arise. In the case of the metal compounds with boron, carbon, silicon, and phosphorus the nonmetal element is always the smallest. Kuz ma (1983) successfully used this concept for the analysis of the structure types of borides. In analyzing the structure types of the binary and ternary phosphides we will hold to the systematics developed by Krypyakevych (1977) also because the CPs of phosphorus atoms are given in the figures. 

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