Abstract
Mössbauer spectroscopy has been used to study the magnetic properties of ferric oxychloride FeOCl. A paramagnetic to antiferromagnetic transition occurs at 92°±3°K. Near liquid‐helium temperature the antiferromagnetic structure is noncolinear; at least two sets of nonequivalent Fe3+ sites and a doubling of the unit cell are required. All Fe3+ spins are confined to the bc plane (c). The most probable magnetic space group is P2cm′2m′ which has two antiferromagnetic sublattices with spins ‖ b and ‖ c, respectively.

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