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Figure 3
Fragments of the calculated ordered [R{\overline 3}2/m] structure. Presentation of the ordered spinel structure as two tetrahedra (white and grey), formed by two types of atoms A6c and A6c (a); presentation of the ordered spinel structure as three octahedra types (white, grey and dashed), formed by atoms B3a, B3b and B18h (b); presentation of the ordered spinel structure as two types of `molecules' – geptamers (c); and the `molecule' – geptamer B3b[B18h]6 (d).

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