The incommensurately modulated NiGe1-xPx, ∼0.3⩽x⩽∼0.7, solid solution: The 'missing link' between the NiP and MnP structure types

The NiP (top) and NiGe (bottom) crystal structures. The structural relationship is emphasised by indicating the xsin[Ge/P] modulation wave in the 4-d space group setting Amam(00γ)s00; γ=1 for NiGe, γ=1/2 for NiP and 0.78<γ<0.70 for NiGe1-xPx with 0.4>x>0.7.