The change of magnetic properties due to the replacement of manganese by chromium in manganese antimonide (MnSb), which is of the NiAs structure, was investigated. It was found that, with the increase of the concentration of chromium, the magnetic behaviour of these compounds (Mn
1−xCr
x)Sb changes as follows: (1) at
x=0 (MnSb), the temperature-magnetization curve shows typical behaviour of ferromagnetic substance, (2) in the range 0.1≤
x≤0.7, it deviates remarkably from the Weiss curve in proportion with the chromium content, and the temperature dependence of the reciprocal susceptibility above the Curie point is of a ferrimagnetic type. (3) In the range 0.8≤
x≤0.9 a transition from ferrimagnetic to antiferromagnetic was observed, and finally (4) at
x=1 (CrSb) a typical antiferromagnetism could be seen. A short discussion of such transitions is given.
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