Abstract
Nanocapsules with the intermetallic compound Ce 3Al 11 as core and amorphous Al 2O 3 (or Al) as the shell have been prepared using the arc-discharge technique. The Ce 3Al 11/Al 2O 3 nanocapsules display superparamagnetic properties between the blocking temperature and the Curie temperature. The cryogenic magnetocaloric effect of the Ce 3Al 11/Al 2O 3 nanocapsules was measured between 2 and 14 K. A maximum magnetic-entropy change −Δ S M of 8.3 J kg −1 K −1 has been observed at 4.5 K for a magnetic-field change from 0 to 70 kOe.
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