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Figure 16
(a) Perspective view of the [GaGe]− subarray [(Ψ-Ge)(Ge)] in phe-LiGaGeO4 (lcs type), which can be compared with the BeP2 substructure in phe-BeP2N4 represented in Fig. 13[link](c). The drawing shows the connected lon-type tunnels yielding the four-connected P skeleton. The two conformations (boat and chair) of the six-membered rings are visible. Be: gray; P: violet. (b) The filled wurtzite-type structure of the Zintl phase LiGaGe. The four-connected skeleton is built from the subarray [GaGe]− ≡ Ψ-Ge. The Li atoms center the hexagonal tunnels running parallel to the c axis. Compare with Fig. 13[link](b). Li: ochre; Ga: green; Ge: dark blue. (c) The stuffed diamond-like structure of the half Heusler phases such as LiAlSi and LiGaSi.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 81| Part 4| August 2025| Pages 378-394
https://doi.org/10.1107/S2052520625004263
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