Table-like magnetocaloric effect of Fe88−xNdxCr8B4 composite materials

Effect of Mn Substitution Fe on the Formability and Magnetic Properties of Amorphous Fe88Zr8B4 Alloy

“…Figure 8 shows the −∆S m peak vs T c −2/3 plots at each magnetic field for the Fe 88-x Zr 8 B 4 Mn x amorphous samples. Combining the results obtained in other Fe-based metallic glasses [3,[18][19][20][21][22][23][24][25], the dependence of −∆S m peak on T c displays a positive correlation in the Fe-Zr-B-based metallic glasses, which is contrary to the −∆S m peak -T c −2/3 relationship proposed by Belo et al [12][13][14][15][16]33]. This is probably because some magnetic parameters including T c and magnetization in Fe-based metallic glasses are dominated by the direct coupling between the Fe-based elements.…”

“…Additionally, the MCE of the intermetallic compounds is closely related to phase structure, which means the Curie temperature (T c ) of these intermetallic refrigerants can hardly be tuned without deteriorating their −∆S m peak , just like the tunable mechanical properties in the Zr-Cu system [11]. On the other hand, metallic glasses, such as Gd-based and Fe-based amorphous alloys [12][13][14][15][16][17][18][19][20][21][22][23][24][25], usually exhibit huge RC but a relatively low −∆S m peak due to their broad −∆S m humps. In addition, the T c and −∆S m peak of these amorphous alloys are tailorable by randomly selecting the composition of the alloys within a certain composition range, such as the compositional-induced structural change in the ZrNi system [26].…”

“…It has been found that the constant −∆S m peak in a long temperature range above and below the Curie temperature, namely, a table-like −∆S m profile, is the most ideal form for magnetic refrigerants working in an Ericsson cycle [16][17][18][19][20]. Obviously, an approximately flat −∆S m profile is difficult to achieve in intermetallic compounds not only because of their narrow −∆S m peak but also due to the difficulty of tuning their T c without dramatically decreasing their −∆S m peak .…”

Compositional Dependence of Curie Temperature and Magnetic Entropy Change in the Amorphous Tb–Co Ribbons

“…Amorphous magnetocaloric alloys, as an important category of magnetic refrigerant, show potential applications from the perspective of magnetic refrigerators because they possess a rather broad "hillside" of magnetic entropy change (−ΔSm) and a low but adequate maximum −ΔSm (−ΔSm peak ), which results in an ultrahigh refrigeration capacity (RC) . This makes it possible to design and manufacture metallic glass composites with a flattened −ΔSm peak within a tailorable temperature span because magnetic refrigerant with a flattened −ΔSm peak within the cold end and the hot end of a refrigerator is expected to be optimal in an Ericsson cycle [6][7][8][9].…”

Iron and manganese based magnetocaloric materials for near room temperature thermal management

“…The good RCP values coupled with soft magnetic behavior and tunable TC make Fe-B-Cr-R amorphous alloys useful for multi-MCM regenerators operating near and above room temperature. Desirable table-like MCE properties were obtained in composite Fe88−xNdxCr8B4 (x=5, 8, 10, 12, and 15) alloys, with the TC ranging from 322 K to 350 K[93]. The |∆SM| of these alloys was found to be constant value of ~ 3.2 Jkg -1 K -1 for a field change of 5 T.…”