Neutron Diffraction and Magnetic Structure of CsMn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

The room-temperature (paramagnetic) structure of CsMn${\mathrm{Cl}}_{3}$ is verified by neutron powder diffraction studies. This compound is found to be a perovskite-related compound (the nine-layer structure) which belongs to the trigonal space group ${D}_{3d}^{5}\ensuremath{-}R\overline{3}m$. The compound is antiferromagnetic below 67 \ifmmode^\circ\else\textdegree\fi{}K; its magnetic structure is deduced from its neutron diffraction pattern at liquid-helium temperature. This structure is of the $G$ type with a $\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}$ vector (\textonehalf{}, \textonehalf{}, \textonehalf{}) related to the rhombohedral crystallographic lattice. The spin direction is perpendicular to the body diagonal of the rhombohedral unit cell. The magnetic symmetry is monoclinic, belonging to the space group $\frac{{C}_{2c}2}{m}$. A dipolar energy calculation confirms the spin direction found. A magnetic moment of $(5.5\ifmmode\pm\else\textpm\fi{}0.5){\ensuremath{\mu}}_{B}$ is calculated for the ${\mathrm{Mn}}^{+2}$ ions.

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