Abstract
The structure and magnetic entropy change of melt-spun LaFe11.57Si1.43 ribbons have been investigated. Here, the 1:13 phase with cubic NaZn13-type structure is obtained by a short-time annealing (1000°C∕1h) in melt-spun-type materials, which in contrast, requires a much longer time annealing at high temperature to develop in the bulk alloy. The Curie temperature is increased from 192K in bulk alloy to 198 and 210K in the melt-spun ribbons prepared at 20 and 40m∕s, respectively, which is attributed to more Si dissolved in the 1:13 phase when the cooling rate increases. The maximal magnetic entropy changes with a change in the magnetic field of 0–5T are 21.2 and 17.8J∕kgK in the melt-spun ribbons prepared at 20 and 40m∕s, respectively, which are close to that of bulk alloy with the same composition subjected to a prolonged heat treatment (21.1J∕kgK). Further analysis confirms the occurrence of a first-order field-induced transition in these three samples. The significantly reduced magnetic and thermal hysteresis and the large value of magnetic entropy change make the melt-spun-type materials prepared at 20m∕s more appropriate for magnetic refrigerant applications, compared with conventional bulk alloys.
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