Abstract
The influence of Ce addition on the nature of phase transition in the La1−x Ce x Fe11.2Co0.7Si1.1 (x = 0, 0.1) alloy system has been investigated. The substitution of Ce for La leads to a decrease of Curie temperature from 264 K to 254 K and to an increase of the maximum value of magnetic entropy change from 19.3 J/(kg K) to 21.5 J/(kg K). A detailed analysis of phase transition using Arrott plots, the Landau theory for order parameter and the construction of a universal scaling curve revealed that replacing 10 at.% La with Ce drives the magnetic transition from second-order to first-order and enhances a field-induced itinerant electron metamagnetic transition above T C.
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