Abstract
Gd3Fe4Si alloy prepared by the arc melting method crystallizes in Mn5Si3-type hexagonal Gd5Si3, LaNi2-type cubic GdFe2, and hexagonal Gd phases. Magnetization and heat capacity measurements performed on the Gd3Fe4Si alloy reveal the occurrence of four second-order magnetic transitions having ordering temperatures at T 1 = 57 K, T 2 = 72 K, T 3 = 225 K and T 4 = 295 K. The multiple magnetic transitions offer interesting magnetocaloric effect (MCE) in this compound. Non-saturation behaviour of magnetization versus field isotherm at 4 K (even at 9 T magnetic fields) suggests the existence of competing ferro- and antiferromagnetic interactions in the compound. The magnetic entropy change (−ΔS M) associated with these multiple magnetic transitions is calculated from isothermal magnetization data using Maxwell equations. The MCE spreads over a wide span of temperature viz, ΔT = 257 K possessing a refrigerant capacity (RC) of 205 J/kg (for a magnetic field change of 0–5 T) with no thermal or magnetic hysteresis. This value of RC is nearly the same as that of the reference giant magnetocaloric material Gd5Ge2Si2 under the same condition. Hence, the wide temperature range MCE (including room temperature) of this material may be the result of multiple magnetic transitions.
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Acknowledgments
One of the authors, Mr. T. P. Rashid, thanks the Slovak government for awarding the National Slovak Scholarship for students. The help rendered by Mr. Nilesh Kulkarni and Mrs. Bhagyashree Chalke, Department of Condensed Matter Physics, Tata Institute of Fundamental Research, Mumbai, India, in structure and compositional measurements is highly acknowledged. This work has been supported by the project VEGA 2/0070/12 and is the result of the Project implementation: University Science Park TECHNICOM for Innovation Applications Supported by Knowledge Technology, ITMS: 26220220182, supported by the Research & Development Operational Programme funded by the ERDF.
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T. P., R., Curlik, I., Ilkovic, S. et al. Gd3Fe4Si Alloy for Magnetic Refrigeration Application in a Wide Temperature Range. J Supercond Nov Magn 30, 2283–2290 (2017). https://doi.org/10.1007/s10948-017-4031-7
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DOI: https://doi.org/10.1007/s10948-017-4031-7