Powder neutron diffraction measurements were performed on an antiferromagnetic manganese sulfide BaLa2MnS5 at 7 and 100 K. This sulfide has a tetragonal nuclear structure with space group I
/mcm. The neutron diffraction data at 7 K show a collinear antiferromagnetic structure (space group I
) with a propagation vector k = (1/2, 1/2, 1/2). The magnetic moment of Mn2+ is estimated to be 4.21 μB and determined to lie in a parallel direction with the c-axis. The magnetic exchange constants, (2J1 + J2)/kB andJ3/kB, are estimated to be −6.6 K and 0.80 K, respectively, from the molecular field approximation.
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