The magnetic structure of the NiAs-type compound, CrSe, has been determined by means of neutron diffraction. The indexing of superstructure lines which appear below the N\'eel point requires a unit cell three times as large as the conventional unit (a=√3aNiAs). Planes parallel to the basal plane contain three chromium atoms whose spins form an "umbrella"-like array with threefold symmetry. Individual moments alternate in sign along lines parallel to the c axis. A value of 2.90 {μ}b has been deduced for the component of the chromium moment perpendicular to the c axis.
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Corliss et al. (1961) studied this question.
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