1. Enhanced Magnetocaloric Properties of Annealed Melt-Extracted Mn 1.3 Fe 0.6 P 0.5 Si 0.5 Microwires.
- Author
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Luo, Lin, Law, Jia Yan, Shen, Hongxian, Moreno-Ramírez, Luis M., Franco, Victorino, Guo, Shu, Duc, Nguyen Thi My, Sun, Jianfei, and Phan, Manh-Huong
- Subjects
MAGNETOCALORIC effects ,MAGNETIC entropy ,TRANSITION temperature ,CURIE temperature ,IRON-manganese alloys ,HIGH temperatures ,MAGNETIC fields - Abstract
The highly regarded Fe
2 P-based magnetocaloric materials are usually fabricated by ball milling, and require an additional extended annealing treatment at high temperatures (at temperatures up to 1423 K for several hours to days). In this work, we show that fabricating Mn1.3 Fe0.6 P0.5 Si0.5 into the form of microwires attained 82.1 wt.% of the desired Fe2 P phase in the as-cast state. The microwires show a variable solidification structure along the radial direction; close to the copper wheel contact, Fe2 P phase is in fine grains, followed by dendritic Fe2 P grains and finally secondary (Mn,Fe)5 Si3 phase in addition to the dendritic Fe2 P grains. The as-cast microwires undergo a ferro- to para-magnetic transition with a Curie temperature of 138 K, showing a maximum isothermal magnetic entropy change of 4.6 J kg−1 K−1 for a magnetic field change of 5 T. With further annealing, a two-fold increase in the maximum isothermal magnetic entropy change is found in the annealed microwires, which reveal 88.1 wt.% of Fe2 P phase. [ABSTRACT FROM AUTHOR]- Published
- 2022
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