Abstract
Gd5Si4 magnets have attracted much attention due to their many appealing properties such as strong ferromagnetism, magnetovolume effect, and large reversal magnetocaloric effect (MCE). However, Gd5Si4 exhibits a relatively high Curie temperature (TC ∼336 K) with a narrow refrigeration temperature span, which limits the refrigeration application at room temperature. Here we show that the TC of Gd5Si4 can be reduced to 330 K and the phase transition temperature range can be effectively expanded by applying a high pressure of 6 GPa to the sample during heat treatment. In addition, the room-temperature magnetic entropy changes are improved and the refrigeration temperature span also becomes wider, which leads to an enhanced relative cooling power (RCP) of 748 Jkg-1 under a magnetic field change of 5 T. These unique features indicate that the Gd5Si4 compound prepared under high pressure can serve as a magnetic refrigerant in a wide temperature range covering room temperature.
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