Achieve good magneto-caloric response near the ambient temperature in a Fe86La7B5Ce2 amorphous ribbon

Excellent Magnetocaloric Performance of the Fe87Ce13−xBx (x = 5, 6, 7) Metallic Glasses and Their Composite

“…Each set of point plots is linearly fitted well, and the slope (expressed by n ) of the linear fitting is 0.756 for x = 5, 0.759 for x = 6, and 0.750 for x = 7, respectively. The values of n are consistent with that of other MGs [ 16 , 17 , 18 , 23 , 24 , 25 , 26 , 29 , 30 ] but slightly larger than the predicted value of the mean field model [ 35 ]. This deviation is mainly caused by local inhomogeneity in MGs because the presence of short-range ordered clusters in MGs leads to a magnetic transformation in a wide temperature range [ 17 ].…”

“…Unfortunately, the values of −Δ S m peak in these Fe-Zr-B-based MG ribbons are still not as high for the practical application of MR. In our recent works, we found that Fe-La/Ce-B-based glassy ribbons show rather excellent MCE near room temperature, and the −Δ S m peak under 5 T of Fe 87 Ce 8 B 5 ribbon reaches 3.65 J/(kg × K) at 283 K, which is 12.3% higher than that of Fe 87 Zr 8 B 5 metallic glass and exceeds the −Δ S m peak of most other Fe-Zr-B-based amorphous alloys [ 29 , 30 ]. The large −Δ S m peak of the Fe 87 Ce 8 B 5 amorphous ribbon was attributed to the extra magnetic moment of the Ce atom, but the effect of Ce content on the −Δ S m peak of the Fe-Ce-B MG ribbons and the involved mechanism is still unclear.…”

Effect of Minor Ce Substitution for Pr on the Glass Formability and Magnetocaloric Effect of a Fe88Zr4Pr4B4 Metallic Glass

“…After constructing the ln(−∆S m )-ln(H) plots at each temperature, we can achieve their slopes (defined as n) by linearly fitting and thus, observe the magnetocaloric behaviors of the Fe 88 Zr 4 Pr 3 B 4 Ce 1 MG in more detail. Figure 5a Although the −ΔSm peak of the Fe88Zr4Pr3B4Ce1 ribbon is not as high as that of the Fe88Zr4Pr4B4 MG, it is still higher than the −ΔSm peak near 310 K of other amorphous alloys and even high entropy alloys (HEA) reported in the literature [25,26,[38][39][40][41]. For example, its −ΔSm peak under 5 T is about 234% higher than that of the Al20Mn20Fe20Co15.5Cr24.5 HEA (1.15 J/(kg × K) at 314 K [38]), 193% higher than that of the Mn20Al20Co14Fe23Cr23 HEA (1.31 J/(kg × K) at 310 K [39]), 22.3% higher than that of the Fe87Zr7B4Dy2 MG (3.14 J/(kg × K) at 308 K [40]), 17.4% higher than that of the Fe87Zr8B4Sm1 MG (3.27 J/(kg × K) at 308 K [25]), 5.5% higher than that of the Fe86La7B5Ce2 MG (3.64 J/(kg × K) at 313 K [41]) and 6.67% larger than that of the Fe88Zr6Pr2B4 MG (3.6 J/(kg × K) at 306 K [26]).…”

“…For example, its −∆S m peak under 5 T is about 234% higher than that of the Al 20 Mn 20 Fe 20 Co 15.5 Cr 24.5 HEA (1.15 J/(kg × K) at 314 K [38]), 193% higher than that of the Mn 20 Al 20 Co 14 Fe 23 Cr 23 HEA (1.31 J/(kg × K) at 310 K [39]), 22.3% higher than that of the Fe 87 Zr 7 B 4 Dy 2 MG (3.14 J/(kg × K) at 308 K [40]), 17.4% higher than that of the Fe 87 Zr 8 B 4 Sm 1 MG (3.27 J/(kg × K) at 308 K [25]), 5.5% higher than that of the Fe 86 La 7 B 5 Ce 2 MG (3.64 J/(kg × K) at 313 K [41]) and 6.67% larger than that of the Fe 88 Zr 6 Pr 2 B 4 MG (3.6 J/(kg × K) at 306 K [26]). Figure 4c displays the −∆S m -T curves of several ironbased MGs under 5 T. The Fe 88 Zr 4 Pr 3 B 4 Ce 1 MG ribbon shows a rather high −∆S m peak near 310 K. On the other hand, the relative cooling power (RCP = −∆S m peak × ∆T FWHM , where ∆T FWHM is the full width at the half of −∆S m peak [42]) of the Fe 88 Zr 4 Pr 4 B 3 Ce 1 MG, can be calculated as 164.7 J/kg under 1.5 T and 646.3 J/kg under 5 T according to the −∆S m -T curve, both of which are similar to the values of amorphous alloys and much higher than those of the first-order magnetic transition alloys or compounds [26,41,43,44]. Since the Fe 88 Zr 4 Pr 3 B 4 Ce 1 MG experiences an SOMPT, it exhibits large value of magnetic entropy changes over a wide temperature range, which may be caused by the coupling interaction between RE-RE and RE-TM.…”

Mechanism for Improved Curie Temperature and Magnetic Entropy Change in Sm-Doped Fe88Zr8B4 Amorphous Alloys

“…Fe It has been reported that the presence of nanocrystals promotes heterogeneous nucleation during crystallization and weakens the thermal stability of AAs [40], while the XRD and DSC results may not distinguish a small number of small-sized nanoparticles [41]. Therefore, in order to further confirm the amorphous structure of the two ribbons, the Fe 88 Zr 6 Sm 2 B 4 amorphous ribbon with a lower GFA was employed for HREM observation.…”