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M\"ossbauer studies of antiferromagnetic FeCO₃ below and above the N\'eel temperature show an asymmetric line broadening, and a constant value of 184 kOe of the magnetic hyperfine field from 0 to 1/2TN. These phenomena are explained using an Ising model with slow electron relaxation. The relaxation rate decreases with decreasing temperature, suggesting a spin-lattice relaxation. The N\'eel temperature was found to be (38.3±{}0.3)^∘{}K, which is 3.3^∘{}K higher than that measured by neutron diffraction.
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Hang Nam Ok (1969) studied this question.
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