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Figure 1
Bärnighausen diagram for RSi2 and R2TSi3 compounds. The header of each box comprises the Hermann–Mauguin symbol of the space group, the range of ordering n and the structure type, whereas the body contains the occupied Wyckoff sites sorted by element. The arrows display the type of transformation between the structures: t is translationengleich, k is klassengleich and i is isomorphic. Fig. 2[link] comprises the respective structure plots. The fourth branch of AlB2-like compounds comprises the superstructures caused by interplays with vacancies (R3□Si5). A potential tetragonal superstructure is presented in the right-hand part of the diagram.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 76| Part 2| April 2020| Pages 177-200
https://doi.org/10.1107/S2052520620001043
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