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The antiferromagetic structure of MnHg was investigated by neutron diffraction measurements on the powder sample. The Mn atoms are arranged on a simple cubic lattice, which splits into two face centred cubic sublattices so that the magnetic moments on one sublattice are antiparallel to those on the other. The magnetic moment of a Mn atom is close to 4 Bohr magnetons. The angles between the magnetic moments and the crystallographic axes remain undetermined. The Néel point is evidently higher than 300°K, and there is no remarkable change in the neutron diffraction pattern at 198°K, where the magnetic susceptibility exhibts a distinctive anomaly and the crystal lattice undergoes a slight distortion from cubic to tetragonal symmetry.
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Nakagawa et al. (1964) studied this question.
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