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The magnetic behaviour of Gd is amongst those that exhibit the most striking characteristics. It is among the few elements capable of changing its magnetic characteristics from ferromagnetism at ambient temperatures to paramagnetism at a comparatively low temperature, that is, at around 20°C. This capacity to change its magnetic characteristics is crucial for application in magnetic refrigeration technology, a cooling method based on the magnetocaloric effect. Moreover, Gd4Fe2O9, which exhibits interesting optical properties due to the presence of Gd3+ ions, which have well-known sharp optical transitions in the visible and near-infrared regions, making the compound potentially useful in luminescent applications. For this purpose, we successfully synthesized the Gd4Fe2O9 compound using a solid-state technique. The X-ray diffraction confirms that the material forms as a single phase in a monoclinic structure with space group P21/c. The scanning electron microscopy SEM and EDX were performed and confirmed the presence of the elements in stoichiometric amounts in the material. The Mossbauer spectrum confirmed that all the iron in the sample is in one local environment. The magnetic field of 50.6 T indicates a strong magnetic interaction between the nuclear magnetic moment and the magnetic field due to surrounding electrons. This work reports on the initial physical properties results, which open up understanding into the physics of this class of materials.
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