Magnetocaloric effect in Ni2(Mn,Cu)Ga0.84Al0.16 Heusler alloys
Alberto A. Mendonca, Luis Ghivelder, Jesus F. Jurado, and Angelo M., Gomes
TL;DR
This study investigates the magnetocaloric properties of Ni2(Mn,Cu)Ga0.84Al0.16 Heusler alloys, revealing significant effects and potential for magnetic refrigeration, especially in alloys with high Cu content.
Contribution
It provides new insights into the magnetocaloric effect in Ni2(Mn,Cu)GaAl alloys, highlighting the impact of Cu substitution on magnetic and thermal properties.
Findings
Large magnetocaloric effect in Ni2Mn0.75Cu0.25Ga0.84Al0.16
High entropy and temperature change in Ni2Mn0.70Cu0.30Ga0.84Al0.16 at room temperature
Improved refrigerant capacity with increased Cu content
Abstract
Polycrystalline Heusler compounds Ni2Mn0.75Cu0.25Ga0.84Al0.16 with a martensitic transition between ferromagnetic phases and Ni2Mn0.70Cu0.30Ga0.84Al0.16 with a magnetostructural transformation were investigated by magnetization and thermal measurements, both as a function of temperature and magnetic field. The compound Ni2Mn0.75Cu0.25Ga0.84Al0.16 presents a large magnetocaloric effect among magnetically aligned structures and its causes are explored. In addition, Ni2Mn0.70Cu0.30Ga0.84Al0.16 shows very high, although irreversible, entropy and adiabatic temperature change at room temperature under a magnetic field change 0-1 T. Improved refrigerant capacity is also a highlight of the 30% Cu material when compared to similar Ni2MnGa-based alloys.
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