Abstract
Single‐crystal X‐ray analysis was employed to study dehydrated wairakite Ca0.97Na0.06K0.03×[Al1.95Si4.04O12] with the following parameters: a = 18.260(4) Å, b = 18.284(4) Å, c = 13.432(3) Å, β = 90.28(3)°, V = 4989(3) Å3, Z = 16, space group B21/d. A comparison was carried out with the structure of the high‐temperature (600°) phase, space group I41/acd. The coordination of the Ca cations increased from 4 to 4 + 1. Additional ligands were acquired from the four‐member ring of the framework upon its deformation and a pairwise countershift of the cations along the c axis. This resulted in a pseudotetragonal unit cell with a doubled volume and lowered symmetry.
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Seryotkin, Y.V., Bakakin, V.V., Belitsky, I.A. et al. Crystal Structure of Dehydrated Wairakite. Journal of Structural Chemistry 43, 802–808 (2002). https://doi.org/10.1023/A:1022829425130
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DOI: https://doi.org/10.1023/A:1022829425130