- Communications Faculty of Sciences University Ankara Series A2-A3 Physical and Engineering
- Vol: 61 Issue: 2
- MAGNETOCALORIC EFFECT AROUND CURIE TEMPERATURE IN Ni50-x CuxMn38Sn12B3 SHAPE MEMORY RIBBONS
MAGNETOCALORIC EFFECT AROUND CURIE TEMPERATURE IN Ni50-x CuxMn38Sn12B3 SHAPE MEMORY RIBBONS
Authors : Olcay Kizilaslan
Pages : 150-160
Doi:10.33769/aupse.532422
View : 6 | Download : 3
Publication Date : 2019-12-01
Article Type : Research
Abstract :The magnetocaloric effect in Ni 50-x Cu x Mn 38 Sn 12 B 3 ribbons depending on the Cu substitution (x= 0, 1, 3) was investigated around the Curie temperature. The purpose of the present study was to analyze the magnetocaloric effect around a second order phase transition (around the Curie temperature) which has a smaller thermal hysteresis compared to a first order phase transition (Martensitic transition). The Curie temperature of the ribbons shifted to higher temperatures with increasing Cu content. A conventional magnetocaloric effect (MCE) was observed around the Curie temperature when the ribbons are subjected to a magnetic field change of 5 T. The magnetic entropy changes were calculated based on the isothermal magnetization data using thermodynamic Maxwell equation. The highest magnetic entropy change and the refrigerant capacity was obtained for the x=1 ribbon.Keywords : Ni-Mn-Sn Heusler Alloys, Magnetocaloric Effect, Magnetic Properties