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Figure 12
(a) Tetrahedral sites for the (17)2 hexaferrite. Each colour refers to one of five groups of symmetry-related tetrahedra, with all other polyhedra shown in white. We can see that two groups lie in RST layers (Fe05 shown in red and Fe06 in yellow), two groups lie in T blocks (Fe07 shown in blue and Fe0A in purple) and the Fe (green) group lies in a TST layer. (b) Tetrahedral sites for the (34)3 hexaferrite. The unit cell contains a threefold repeat of the sequence shown, with subsequent repeats translated in-plane by (2/3, 1/3). Each colour refers to one of ten groups of symmetry-related tetrahedra, with all other polyhedra shown in white. We can see that four groups lie in RST layers (Fe08 shown in red, Fe0B in gold, Fe0I in orange and Fe0S in yellow), four groups lie in T blocks (Fe0E shown in dark blue, Fe0J in light blue, Fe0O in dark purple and Fe0Q in light purple) and two groups lie in TST layers (Fe1A shown in dark green and Fe1 in light green).

IUCrJ
Volume 5| Part 6| November 2018| Pages 681-698
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518011351