The crystal structure of the 'MnsSi2C' phase has been determined by single-crystal X-ray diffraction analysis. The lattice constants are a=6.4492 (5), b=6.5187 (7), c=9.944 (2) A, ~=84.709 (8), ,8= 99"588 (8), 7= 119.979 (8) ° and the space group is P1 with 32 atoms in the unit cell. The structure has been determined by direct methods and refined by full-matrix least-squares analysis to a final R of 0" 12, based on 2027 reflexions observed with the diffractometer. The 'MnsSi2C' phase is related to intermetallic complex phases such as Laves phases of the type MgZn2 and belongs to the family of cementite carbides. There are close similarities between the structural arrangement in the MnsSiC phase and 'MnsSi2C' phase but in the latter the presence of a square 'tile' signifies a mixed Mn-Si site. This structure allowed us to interpret the (Mnl_~,Mox)sSi2C and (Mn1_xFe~)aSizC solid solutions and their limits.

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