 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
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![[Figure 5]](ra5152fig5mag.jpg)
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Figure 5
(a) Fragment of the planar chain of fibrous SO3 formed by SO4 corner-sharing tetrahedra. The S atoms show the twofold connectivity characteristic of sextels. S: green, O: red. (b) Structure of the polyanion [Si2O6]4− (Ψ-SO3) in the silicate Na4[Si2O6]. Si: dark gray, O: red. (c) Fragment of the planar chain of SeO2(E) ≡ SeO3. Se: light-purple; O: red. (d) Perspective view of a fragment of the structure of the Zintl phase BaSi (B33 type; Cmcm, No. 63), which shows the same zigzag chains of the Si (Ψ-S) atoms. Ba: dark blue; Si: light gray. (e) The structure of BaSiO3 (P212121, No. 19), where the [BaSi] substructure adopts the same topology as the Zintl phase BaSi (d) despite being embedded in an O-atom matrix. Views (a), (b), (c) and (d) are reproduced from Vegas (2018  ) with permission. |
![[Figure 5]](ra5152fig5.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
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