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Figure 3
Differences in the arrangement of Si/T (blue) zigzag chains in hexagonal (left) and tetragonal (right) RSi2 and R2TSi3 compounds. The consecutively added zigzag chains (red bonds) in hexagonal compounds always lie within the same plane, whereas in tetragonal compounds these layers are rotated by 90° along the bonds shown in orange. The 12-fold coordination of the R elements is highlighted for one atom ,as an example, with bonds shown in black.

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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