Polycrystalline sample of Mn3[Fe(CN)6]2·xH2O was prepared by coprecipitation method. The coprecipitated powder was annealed in vacuum at different temperatures of 80, 100, 130, and 150 °C respectively. Changes of magnetic properties with different annealed temperatures were studied by Fourier‐transform infrared, X‐ray diffraction and magnetization measurements. The positive θ value of the Curie–Weiss temperature indicates the existence of a predominant ferromagnetic interaction over the anti‐ferromagnetic one in the compounds annealed at 80, 100, and 150 °C. The negative value of θ in Mn3[Fe(CN)6]2·xH2O annealed at 130 °C appears to be the coexistence of a strong anti‐ferromagnetic and a ferromagnetic interactions in the material. This is due to the existence of a relatively strong anti‐ferromagnetic contribution between the neighbouring Mn atoms bridged by the oxygen atom of the water molecule (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Liu et al. (2011) studied this question.