A Novel Magnetic Phase Transition in Anhydrous Iron (III) Phosphate, FePO₄
Magnetic susceptibility, Mossbauer spectroscopy and powder neutron diffraction experiments have shown that iron(III) phosphate, FePO4, undergoes a novel spin reorientation transition at 17K between two antiferromagnetic phases. The ordered magnetic moments lie in the basal plane of the trigonal unit cell between the Neel temperature (24K) and 17K, below which temperature the spins align along the unique (c) axis.
P. D. Battle et al., "A Novel Magnetic Phase Transition in Anhydrous Iron (III) Phosphate, FePO₄," Journal of Physics C: Solid State Physics, IOP Science, Jan 1982.
The definitive version is available at https://doi.org/10.1088/0022-3719/15/26/007
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