| |
| Polycrystalline sample of Mn3[Fe(CN)6]2oXH2O 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℃. The negative value of θ in Mn3[Fe(CN)6]2oXH2O annealed at 130℃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. |
|
| Keywords: Magnetic properties;Infrared spectroscopy;Annealing temperature |
|
