(a) Projected unit cell of an idealized (cubic) γ-Al2O3 spinel structure. The numbers located within the circles representing the atomic positions give the z coordinates in multiples of . Further panels give an overview of considered planar defects: (b) conservative APB of the type , (c) non-conservative APB , (d) non-conservative APB introduced by the rotation of the γ-Al2O3 unit cell around the
 direction, (e) non-conservative APB and (f) conservative APB . More detailed models are provided in the supporting information.