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Figure 4
Atomic structure of the Ba–Ti–O APs derived from the 4D model. (a) The sigma-phase approximant. (b) The hypothetical AP with a unit-cell parameter of 25.6 Å. Circles drawn in lime, red and blue indicate Ti, O and Ba atoms, respectively. The thin black square indicates the unit cell. A dodecagon characteristic to the NGT is highlighted by the translucent blue colour.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 78| Part 2| April 2022| Pages 247-252
https://doi.org/10.1107/S205252062200227X
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