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The crystallographic parameters of the incommensurately ordered phase ηʺ of the composition Cu 1.235 Sn are reported. This phase belongs to the group of ordered Ni 2 In/NiAs-type phases, with a NiAs-type arrangement Cu(1)Sn and additional Cu(2) atoms partially occupying trigonal-bipyramidal interstices in an ordered fashion, leading to the formula Cu(1)Cu(2) 0.235 Sn = Cu 1.235 Sn. The structure model, afterward refined on the basis of powder X-ray diffraction data, has been derived on the basis of the slightly Cu-poorer commensurately ordered η′-Cu 6 Sn 5  (=Cu 1.2 Sn) phase but also on previously reported commensurate structure models η 8 -Cu 1.25 Sn and η 4+1 -Cu 1.243 Sn derived from selected area electron diffraction data. In line with a recent work (Leineweber, Wieser &amp; Hügel,  Scr. Mater.  2020,  183 , 66–70), the incommensurate ηʺ phase is regarded as a metastable phase formed upon partitionless ordering of the η high-temperature phase with absent long-range ordering of the Cu(2) atoms. The previously described η 8  and η 4+1  superstructure are actually of the same phase, and the corresponding superstructure models can be regarded as approximant structures of the ηʺ phase.

Crystal structure of incommensurate ηʺ-Cu 1.235 Sn intermetallic