Abstract
Ferrous hydroxide free from oxidation was prepared by precipitation from an aqueous solution in an inert gas atmosphere and measured for magnetic susceptibility and magnetization. The antiferromagnetic transition was observed at 34 K, where the susceptibility showed a sharp maximum. The magnetization at 4.2 K increased as the external field increased, and reached 3.6 μ B per ion at 75 KOe, which is about 90 % of the saturation magnetization of Fe ++ ion. By analyzing the magnetization curve and the Mössbauer effect, the magnetic structure in an ordered state was deduced as follows: the moments within the layer are arrayed parallel, while those between the adjacent layers antiparallel. The spin easy axis lies in the c-plane. The quadrupole splitting was 3.00 mm/sec at 90 K and showed little temperature dependence between 4.2 K and room temperature. The energy state of Fe ++ ion in Fe(OH) 2 was specified by the orbital singlet 5A 1g derived from the sign and the magnitude of 1 2 e 2 qQ . The difference in the magnetic property between Fe(OH) 2 and FeCl 2 was discussed from the energy state of Fe ++ ion.
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