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Figure 9
(a) Structural model of the intermediate structure, with large available tetrahedral interstices as indicated; (b, c) filling tetrahedral interstices with a few Al3+ cations to form the Paglia model; (d, e) filling tetrahedral interstices with more Al3+ cations to form this-work model; (f, g) filling tetrahedral interstices with Al3+ cations symmetrically to maintain a geometrical constraint (a = b = c/21/2) to form a cubic structure, which is a skeleton of the Smrčok model. Notice the substantial lattice contraction along b in this process. Octahedral Al is shown in green, tetrahedral Al in blue, and O in red.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 77| Part 5| October 2021| Pages 772-784
https://doi.org/10.1107/S2052520621008027
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