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The crystal structures of two new ternary, incommensurately modulated phases in the Cr/Mo/Ge system, Cr 1-   x  Mo  x  Ge ∼1.75  with  x  = 0.65 and 0.84, have been refined using the same composite approach as for the earlier reported compounds, (Mo/Rh) 11 Ge 18  and (Mo/Rh) 13 Ge 22 , from the Mo/Rh/Ge system. The composite model consists of a rather stable diamond-like transition metal substructure and a helical main group element arrangement. The same super space group pair,  W : P 4/ nnc : q1̅q1  P : I 4 1 / amd : 11̅ss, the same positions and modulation waves were used. The refinements of the new phases in the Cr/Mo/Ge system converged rapidly to  R -values below 5% with GOF of 2.53 and 3.71, respectively. Each structure is built by two sub lattices with the parameters -  a ,  c x   and the modulation vector  q x   - for Ge and  a ,  c  T  and q T  for the transition metals. The refined data for  x  = 0.65 are found to be  a  = 5.935(2),  c x   = 2.770(1),  c  T  = 4.839(1),  q x   = 0.428 [001]*,  q T   = 0.253 [001]* and for  x  = 0.84,  a  = 5.963(1),  c x   = 2.786(1),  c  T  = 4.875(1),  q x   = 0.430 [001]*,  q T   = 0.264 [001]*. It is clearly shown the composite approach is applicable to different chimney-ladder compounds, even though they have quite different compositions and hence  q -vectors.

Incommensurately modulated Nowotny Chimney-ladder phases: Cr 1- x Mo x Ge ∼1.75 with x = 0.65 and 0.84