Fe4N and PAS

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    mdelaey
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    Fe-I has a 3-fold rotation axis and thus is eta equal to zero, according to the first theorem.
    Fe-II has a 4-fold rotation axis which means that eta is once again zero, according to the first theorem.
    (I assumed that there is no difference between Fe-IIa and Fe-IIb in the picture, otherwise Fe-I would have no rotation axis and Fe-II a 2-fold axis)

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