Abstract
The structural, critical behavior and magnetocaloric properties of Pr2Fe16.9Ni0.1 alloy have been studied. Rietveld's refinement of the X-ray powder diffraction patterns shows that the sample crystallizes in the rhombohedral structure with an R3¯m space group. Based on thermomagnetic measurements, critical behavior was investigated using the modified Arrott plot, Kouvel-Fisher methods, and critical isotherm analysis. The critical exponents (β, γ, and δ) were found to be similar to the 3D-Ising type indicating that the magnetic interactions extend beyond the nearest neighbors. Furthermore, Pr2Fe16.9Ni0.1 exhibits a direct magnetocaloric effect around room temperature with moderate magnetic entropy change (−ΔSMmax = 6.2J.kg−1.K−1 at μ0ΔH=5T) and a wide working temperature range. Additionally, the Relative Cooling Power (RCP) is about 89% of the well-known gadolinium (Gd) for μ0ΔH=2T. The good magnetocaloric response of this compound is comparable or even better than that of many other intermetallic alloys.
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