Crystal structure of K-substituted gonnardite: separation of local water–cation assemblages
Source abstract
Abstract
K-substituted gonnardite, K2.18Na0.04Ca0.02[Al2.26Si2.74O10]·2.2H2O, was studied by X-ray powder diffraction method. The structure was refined with the Rietveld technique in the tetragonal space group $$I\overline{4} 2d$$ with a = 13.65409(16), c = 6.56928(11) A, V = 1224.74(2) A3, Z = 4. Most of K+ cations (1.94 apfu) statistically occupy three nearest positions to be considered as the split one. “Excess” cations are located in the position non-typical for K+. Statistics in the cation distribution is defined by the occupation of the additional position. Based on a crystal chemical positional model (C2R2A2) [T5O10], the separation of the local water–cation assemblages from an average statistical pattern has been suggested.
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Research context
OpenAlex topics: Crystal Structures and Properties · Chemical Synthesis and Characterization · X-ray Diffraction in Crystallography
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