 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
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![[Figure 3]](bs0008fig3mag.jpg)
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Figure 3
Idealized (Si2O52−)∞ layers in (a) β-K3NdSi6O15 and (b) α-K3NdSi6O15·2H2O. Silicate tetrahedra for which the O—O edges from bridging to terminating O atoms are drawn in solid lines have their apical O atom above the plane of the layer, whereas those for which these edges are drawn in dotted lines have their apical O atom below the plane of the layer. Several structural features are highlighted. In (a) an Si4O13 unit is shown in the upper right-hand corner of the unit cell, three triangles that form faces of NdO6 that lie above the layer are shown in solid lines in the lower portion of the unit cell and three triangles that form faces of NdO6 octahedra that lie above the layer are shown in dotted lines. In (b) an Si6O15 unit is shown in the upper left-hand portion of the figure and to its right an Si4O13 unit is shown. Triangles shown in bold represent NdO6 octahedral faces formed by these two types of silicate units to octahedra that lie above the silicate layer and those shown in dotted lines represent octahedral faces formed to NdO6 polyhedra that lie below the layer. |
![[Figure 3]](bs0008fig3.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
