Abstract
In the present work, the magnetocaloric effect (MCE) and magnetic properties of Tb(Co0.94Fe0.06)2 alloy were studied. X-ray diffraction pattern taken at room temperature confirms that the sample crystallizes in single phase with rhombohedral structure. The paramagnetic to ferromagnetic phase transition was observed at 304 K near the room temperature. Banerjee criterion and universal scaling of the MCE was employed to confirm the second-order nature of the magnetic transition. Differential scanning calorimetry and magnetic characterizations have shown the absence of thermal and magnetic hysteresis in the paramagnetic-ferromagnetic transition region. The magnetic entropy change for Tb(Co0.94Fe0.06)2 associated with the ferromagnetic transition has been observed over a wide working temperature range (93 K) leading to large refrigerant capacity. The maximum value of magnetic entropy change (−ΔSM) under 5 T magnetic field is 4.3 J/kgK and the corresponding value of refrigerant capacity is 368.7 J/kg. Interestingly, the magnetocaloric performance of Tb(Co0.94Fe0.06)2 alloy is comparable with some rare-earth-based magnetocaloric materials. These remarkable features make this alloy a suitable candidate for magnetic refrigeration at room temperature.
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