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Figure 4
Crystal structure of the Hc phase main layers featuring (a) the aluminium octahedra and (b) the calcium-capped trigonal antiprisms. (c) Packing diagram of the Hc phase in the viewing direction of the b axis. In the interlayer region the carbonate group and the crystallographically bonded water molecules are presented, whereas the interlayer OH− group is omitted for clarity. The unit cell is outlined with solid lines.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 68| Part 5| August 2012| Pages 493-500
doi:10.1107/S010876811203042X
Follow Acta Cryst. B
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