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Figure 1
Unit cell of CaF2 with (a) Ca atoms positioned externally, at the faces and edges of the cell, and (b) Ca atoms positioned internally. (c) CrystalWalk interface (adapted) displaying the fluorite motif, with the cropped unit cell and sublattices of Ca (grey) and F (red and blue). Source: (a) adapted from Askeland (1990BB1); (b) adapted from Callister & Rethwisch (2007BB2).

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