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In this study, we have investigated the microstructure and magnetic entropy change of annealed LaFe11.0Co0.8(Si0.4Al0.6)1.2 alloy in a form of bulk samples and melt-spun ribbons. The bulk samples were annealed at 1323 K for 20 and 49 days and the maximum values of the magnetic entropy change |∆SM| obtained after the change of external magnetic field from 0 to 5 T reached 7.5 J kg−1 K−1 and 7.7 J kg−1 K−1, respectively. For the melt-spun ribbon annealed at the same temperature for 1 h, the maximum value of |∆SM| reaches 4.5 J kg−1 K−1. The temperature corresponding to the maximum entropy change increased from 292 K for bulk samples to 295 K for melt-spun ribbons. The lower values of the magnetic entropy change in the melt-spun LaFe11.0Co0.8(Si0.4Al0.6)1.2 are attributed to the presence of higher volume fraction of the secondary bcc-Fe phase in the ribbon samples.

Structural and Magnetocaloric Study οf the LaFe11.0Co0.8(Si0.4Al0.6)1.2Alloy

Structural and Magnetocaloric Study οf the LaFe_11.0Co_0.8(Si_0.4Al_0.6)_1.2Alloy