Reversibility of magnetostructural transition and associated magnetocaloric effect above room temperature in Ni-Co-Mn-In-Gd polycrystal

Enhanced Refrigeration Capacity of Rare-Earth-Free Ni-Co-Mn-In-Si Heusler Alloys for Magnetic Refrigerants

“…Figures 6a and 6b illustrate the magnetic entropy change (ΔS M ) vs. temperature curve of S0h and S10h under different magnetic fields from 1 T to 5 T. From the figure, it is clear that both the samples show a high inverse magnetocaloric effect near the martensitic transition. 22 To be specific, the positive ΔS M values further confirm the inverse MCE, which is consistent with the large magnetization shift from the weak magnetic martensite to the ferromagnetic austenite. As the magnetic entropy change (ΔS M ) with respect to the external magnetic field determines the magnetocaloric effect of a given material, the observed peak values of ΔS M of S0h and S10h are ∼9.8 J kg −1 K −1 at 262 K and ∼8.2 J kg −1 K −1 at 242 K, respectively under 5 T. It is noteworthy to mention that the values of ΔS M increase with the applied field in both the alloys which is illustrated in Fig.…”

“…The RC of S0h is the same at the field of 1 T which significantly decreases with an increase in the field as compared to the sample of S10h. Particularly, the RC of S0h is 392.8 J. kg −1 , whereas S10h exhibits as 462.68 J. kg −1 at 5 T which proves to be a promising magnetic refrigerant and S010h possesses a significantly high RC value as compared to that of previous reported Ni- Mn [20][21][22]25,37 Further, Table II. presents the comparison of the RC value of S10h with some of the reported Ni-Mn-X materials.…”

“…14 Further, heat-treatment driven Ni 51 Mn 34 In 14 Si 1 ribbons have shown the ΔS M of 14.1 J kg −1 K −1 and RC of 37.3 J Kg −1 . 15 Among Ni-Mn-X based alloys, [1][2][3][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Ni 45 Co 5 Mn 37 In 12 Si 1 Heusler alloy is known for their superior magnetic field induced transition and inverse MCE. 23,24 Particularly, the obtained maximum RC values of Ni 50 Mn 34 Co 1 In 15 , Ni 49.8 Co 1.2 Mn 33.5 In 15.5 , Ni 45 Co 5 Mn 35 In 14 Gd 1 are 229 J kg −1 , 125 J kg −1 , 255 J kg −1 , respectively under an applied magnetic field of 5 T. [20][21][22] The current study is to investigate the influence of heat-treatment on MCE of Ni 45 Co 5 Mn 37 In 12 Si 1 .…”

“…15 Among Ni-Mn-X based alloys, [1][2][3][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Ni 45 Co 5 Mn 37 In 12 Si 1 Heusler alloy is known for their superior magnetic field induced transition and inverse MCE. 23,24 Particularly, the obtained maximum RC values of Ni 50 Mn 34 Co 1 In 15 , Ni 49.8 Co 1.2 Mn 33.5 In 15.5 , Ni 45 Co 5 Mn 35 In 14 Gd 1 are 229 J kg −1 , 125 J kg −1 , 255 J kg −1 , respectively under an applied magnetic field of 5 T. [20][21][22] The current study is to investigate the influence of heat-treatment on MCE of Ni 45 Co 5 Mn 37 In 12 Si 1 . Herein, we present the promising magnetic refrigerant material of Ni 45 Co 5 Mn 37 In 12 Si 1 with a maximum RC of 462.68 J kg −1 at 5 T with a wide operating temperature of 53.8 K prepared by arcmelting and heat-treatment, which is relatively high as compared with high-performance Gd 5 Si 2 Ge 2 (RC = 447 J kg −1 ) at 5 T. 25 Overall, the strong magnetocaloric efficiency of Ni 45 Co 5 Mn 37 In 12 Si 1 alloy and its near ambient working temperature window makes it as ideal for future refrigeration applications.…”