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– Mg 4 (tetrahedral) : Al 6 (octahedral)
O with Mg in Td holes and Al in Oh holes
Polyhedra – Unconnected , edge-sharing
The spinel structure AB2O4: (a) the close-packed arrangement of anions (O2−) in the full unit cell (close-packed layers are arrowed); the smaller simple ccp unit cell is outlined in blue; (b) the arrangement of cations and anions within the full unit cell with the A cations shown in magenta and B cations in red; (c) and (d) the polyhedral coordination of A (tetrahedral) and B (octahedral) by oxide for cation sites fully within the unit cell.
Related Structure: Inverse spinel (Mg2TiO4)
Provided by the
