Crystal data for Mn₅Si₂

The cell dimensions of Mn₅Si₂ have been refined by least squares with the powder diffraction data of J. P. Sénateur (Thèse Doct. Sci. phys. Paris, 1967). Mn₅Si₂ is isotypic with the D phase (V_26.5Fe₄₄Si_29.5), and is tetragonal, a = 8.9097 ± 2, c = 8.7153 ± 3 Å, 56 atoms per unit cell, space group P4₁2₁2. The observed powder diffraction intensities are compared with those calculated for the refined crystal structure (C. B. Shoemaker & D. P. Shoemaker, Acta Cryst. to be published).