The crystal structure of the new phase Er 0.85 Co 4.31 Si was determined by single-crystal X-ray diffraction (46 unique reflections, R1 = 0.0378, wR2 = 0.0697). The compound crystallizes in the TbCu 7 structure type: space group P6/mmm, hP8-1.85, with lattice parameters a = 4.8593(19), c = 3.9869(16) Å. A full investigation of the crystal structure was also performed for the known phase CoSi on single-crystal X-ray diffraction data (61 unique reflections, R1 = 0.0256, wR2 = 0.0548). CoSi crystallizes in the FeSi structure type: space group P2 1 3, cP8, with lattice parameter a = 4.4500(5) Å.
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