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Figure 9
The coordination scheme of the Na atom in the average structure. The two outer tetrahedral chains (blue) belong to the closest neighbouring layer. One of the coordinating O atoms (O2) belongs to the next [Si3O7] layer. Distances corresponding to the modulated structure are shown.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 62| Part 3| May 2006| Pages 440-446
doi:10.1107/S010876810600663X
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