 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
journal menu
![[Figure 2]](br0087fig2mag.jpg)
|
|
Figure 2
Polyhedral representations of the crystal structures of (a) moganite (SiO2), (b) moganite-type PON, (c) the Imab aristotype of moganite and (d) orthorhombic BeH2. Dark and light polyhedra represent tetrahedra centred by A1 [A1(X2)2(X3)2] and those centred by A2 [A2(X1)2X2X3] forming the (A2X6)n chains, respectively. The X1 atoms link the A2-centred tetrahedra to form the chains; X2 and X3 link the chains to the A1-centred tetrahedra. (Note: in Imab X2 = X3.) In (a) the diagonal alternating layers of (101¯1) slices of right- and left-handed quartz are indicated by r and l, respectively and the crystallographically distinct X atoms are also indicated. |
![[Figure 2]](br0087fig2.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
