Abstract
The master Gd5Si1.8Ge1.8Sn0.4 MCE alloy was prepared by the arc-melt method. The alloy was re-melted and melt-spun by single-roller melt spinning at different copper wheel speeds. Temperature-dependent x-ray diffraction (XRD) and magnetic measurement confirm the first-order magnetic–crystallographic transition of as-cast Gd5 Si1.8Ge1.8Sn0.4. From powder XRD results, the melt-spun technique preserves the monoclinic phase of Gd5Si1.8Ge1.8Sn0.4 but broadens the corresponding Bragg reflection which implies the smaller crystalline size of the melt-spun ribbons. For the spun ribbons, the refrigerant capacity (RC) is comparable to that of the as-prepared Gd5Si1.8Ge1.8Sn0.4. The thermal (∼9.2 K) and magnetic hysteresis (∼62 J kg−1 at 270 K) near TC of the as-cast alloy have been significantly reduced (∼4 K and ∼5.7 J kg−1 to ∼7.5 J kg−1 for ribbons, respectively) with the help of the melt-spun technique. The low hysteresis and large RC values make the spun ribbons suitable for magnetic refrigeration application near room temperature.
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