Abstract
The magnetocaloric effects can be enhanced in GdNiSi1-xAlx (0 ≤ x ≤ 0.3) alloys by Al doping. The substitution amount is limited to x = 0.3. GdNiSi and GdNiSi0.9Al0.1 alloys exhibit an antiferromagnetic ground state and the phase transition temperatures are 13 K and 10 K under 0.05 T, respectively. GdNiSi0.8Al0.2 and GdNiSi0.7Al0.3 alloys exhibit a ferromagnetic ground state and the phase transition temperatures are 18 K and 26 K under 0.05 T, respectively. These alloys undergo the field-induced first-order metamagnetic transition from antiferromagnetic to ferromagnetic states. For Δμ0H of 0–7 T, the values of the maximum magnetic entropy change (the relative cooling power) are 7.7 J/kgK (173.1 J/kg), 11.4 J/kgK (303.2 J/kg), 14.3 J/kgK (447.9 J/kg) and 13.0 J/kgK (494.4 J/kg) in GdNiSi1-xAlx (x = 0, 0.1, 0.2 and 0.3) alloys.
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