Figure 3
The structural units given in Fig. 2(b) as derived from (a) the parent cubic approximant structure by applying (b) crystallographic shear and then (c) unit-cell twinning. Shear planes [(10) planes of the parent structure] are indicated by arrows in (a). Twin planes [(001) planes of the sheared structure] are indicated by arrows in (b). Colour codes: icosahedral clusters (blue); pseudo-Mackay clusters (red). |