PAS

[Johanna Waltenspiel]

Fe I:
We find a 4 fold rotation axis along the diagonal trough the Fe I side and the body centered atom. This axis is the z-axis of the PAS.
No other rotation axes (apart from 1 fold) are present.

Fe II:
A 4-fold roation axis through the Fe II atom and the body centered atom is present and therefore the z-axis of the PAS.
No other rotation axes are found.

[Johanna Waltenspiel]

If we consider a continuous material, instead of only this cell, there are some more rotation axes (this feels like too many?). The axes described always go through the nearest atom of a particular kind to the named and considered atom.

Fe I:
Yellow arrow: 4 fold (with other 4 fold: -> Theorem 2:EFG = 0)
Axis through FeI and Fe IIa: 2 fold
Axis through FeI and Fe IIb (bottom one): 2 fold

Fe IIa:
Fe IIa to Fe IIa (diagonal, not through middle): 2 fold
Fe IIa to Fe IIb: 2 fold
Fe IIa to Fe I: 2 fold

Fe IIb:
Fe IIb – Fe I: 2 fold
Fe IIb – Fe IIa: 2 fold

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