Abstract
Microstructure and magnetocaloric properties have been investigated in a series of off-stoichiometric La2-xCexFe11Si2 (x = 0.2–1.2) magnetic refrigeration alloys. A complex multi-phase structure containing (La,Ce)1(Fe,Si)13, La5Si3, (La,Ce)2(Fe,Si)17, La1Fe1Si1 and α-Fe phases was observed for Ce-doping alloys. Entropy change can be enhanced by the substitution of Ce for La, but higher Ce content (x > 0.8) leads to the decrease of magnetocaloric effect owing to the formation of (La,Ce)2(Fe,Si)17 precipitates. The optimized composition of La1.2Ce0.8Fe11Si2 alloy exhibits a maximum entropy change of 21.8 J/kgK in 2 T, and a large volume change of 1.6% on the strong magnetoelastic coupled transition.
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