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Topological analysis of atomic nets in the crystal structures of 284 anhydrous inorganic salts M y (TO 4 ) z  (T = Si, Ge, P, As, S, Se, Cl, Br, I) containing isolated orthogroups TO 4  was performed by means of the program package TOPOS 3.2. The topological relations were found among the M y (TO 4 ) z  salts and 1164 topological types of the binary compounds A y X z  at the two levels: grey isomorphism and partial isotypism. Using the method of coordination sequences nearly a half (47.5%) of the ortho structures in the quasi-binary representation M y [T] z  were found to match 27 frequent topological types of the binary compounds (NaCl, NiAs, FeB,  α -Al 2 O 3 , etc.). The model of cation arrays was shown to sometimes disagree with the model of atomic nets while comparing; the reasons of such disagreements were discussed.

zeitschrift für kristallographie - crystalline materials

Orthotetrahedral crystal structures M y (TO 4 ) z  (T = Si, Ge, P, As, S, Se, Cl, Br, I): geometrical-topological analysis, quasi-binary representation, and comparison with the A y X z  compounds by the method of coordination sequences