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Figure 5
Structures of (a,d) SnO2, (b,e) columbite-type CoNb2O6 and (c,f) Co4Nb2O9 phase with structure coparable to that of corundum in orientations relevant for understanding the formation of (a)–(c) contact and (d)–(f) alternating cyclic twins in cassiterite by oriented growth of SnO2 on the two structurally related phases. Typical pattern (projected unit cell) of each phase is drawn on the structural models and these patterns will be used for schematic illustration of epitaxial twinning in Figs. 6[link]–8[link][link]. A stereogram with the most relevant lattice planes involved in the twinning process is shown below each structural model.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 78| Part 4| August 2022| Pages 695-709
https://doi.org/10.1107/S2052520622006758
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