Excellent magnetocaloric performance of a Fe88Zr4Pr4B4 amorphous alloy and its amorphous hybrids

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

“…Table2lists the −∆S m peak under various magnetic fields of the Fe 88 Zr 8−x RE x B 4 (RE = Sm, Pr, Nd; x = 0, 2, 4) AAs. One can find that the improvement in the −∆S m peak by the minor Sm addition was not as high as that resulting from the Pr and Nd additions at a fixed RE content; for example, the −∆S m peak of the Fe 88 Zr 6 Sm 2 B 4 amorphous ribbon at 5 T was ~3.53 J/(K × kg) at 317 K, which was lower than that of the Fe 88 Zr 6 Pr 2 B 4 AA ribbon (~3.60 J/(K × kg) at 306 K[34]) and the Fe 88 Zr 6 Nd 2 B 4 AA ribbon (~3.65 J/(K × kg) at 314 K[35]); the −∆S m peak of the Fe 88 Zr 4 Sm 4 B 4 amorphous ribbon at 5 T was ~3.79 J/(K × kg) at 348 K, which was lower than that of the Fe 88 Zr 4 Pr 4 B 4 AA ribbon (~4.00 J/(K × kg) at 323 K[34]) and much lower than that of the Fe 88 Zr 6 Nd 2 B 4 AA ribbon (~4.10 J/(K × kg) at 335 K[35]).…”

“…Fortunately, the spin-glass freezing behaviors and hysteresis are usually negligible when the RE concentration is very low because the anisotropic clusters are hard to couple with each other due to the low density of these clusters [34,35]. Therefore, we selected the Fe 88 Zr 4 Sm 4 B 4 AA that contained the highest Sm content in the present work to study its low-temperature magnetic properties and their possible effect on the magnetocaloric properties in more detail.…”

“…Therefore, we selected the Fe 88 Zr 4 Sm 4 B 4 AA that contained the highest Sm content in the present work to study its low-temperature magnetic properties and their possible effect on the magnetocaloric properties in more detail. Fortunately, the spin-glass freezing behaviors and hysteresis are usually neglig when the RE concentration is very low because the anisotropic clusters are hard to co with each other due to the low density of these clusters [34,35]. Therefore, we selected Fe88Zr4Sm4B4 AA that contained the highest Sm content in the present work to stud low-temperature magnetic properties and their possible effect on the magnetoca properties in more detail.…”

“…More recently, we found that the −∆S m peak of Fe-Zr-B ternary AAs was further increased by a minor substitution of RE elements for the Zr, and a larger −∆S m peak was achieved in the Fe 87 Ce 8 B 5 AA ribbon (3.65 J/(K × kg) at 282.5 K) [33], Fe 88 Zr 4 Pr 4 B 4 glassy ribbon (4.0 J/(K × kg) at 323 K) [34], and Fe 88 Zr 4 Nd 4 B 4 glassy ribbon (4.1 J/(K × kg) at 335 K) [35]. The Sm element, with similar characteristics to Pr and Nd, also seemed to be a good substitute for Zr in improving the magnetocaloric performance of Fe-Zr-B AAs.…”

“…However, the GFA and −∆S m peak of these AAs decrease dramatically with their increasing T c , and thus, Gd-based AAs with a T c near room temperature exhibit a very low −∆S m peak and a poor GFA, which makes them hard to fabricate [25][26][27]. In contrast, TM-based AAs, represented by Fe-based AAs, exhibit a fairly good GFA and can be easily prepared within a wide compositional range, which makes their T c tailorable within the operating temperature interval of a domestic refrigeration appliance [28][29][30][31][32][33][34][35]. The shortcoming of Fe-based AAs is their low −∆S m peak ; for example, the −∆S m peak under 5 T of Fe-Zr-B ternary glassy alloys is usually not higher than 3.3 J/(K × kg) near room temperature [28,29].…”