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Figure 17
(a) Fragment of the hexagonal structure of phe-BeP2N4, isostructural to the mineral phenakite Be2SiO4. Be: green; P: violet (N atoms omitted). The fragment has similarities with the Li2S substructure of β-Li2SO4 (P21/c) at ambient conditions. S: yellow; Li: blue (O atoms have omitted). The stereopair of the room-temperature structure of β-Li2SO4 is shown in (b). The Li2S substructure forms a distorted antifluorite structure in which the S atoms form a distorted fcc array, with the 2n tetrahedral voids occupied by Li atoms. Note the irregularity of both the Li8 and S8 cubes, in contrast with the rather regular S6 octahedron. Reproduced from Vegas (2018View full citation) with permission.

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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