1. Effect of Fe on the microstructure and magnetic transition of Mn-Fe-P-Si Microwires.
- Author
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Luo, Lin, Shen, Hongxian, Zhang, Lunyong, Sun, Jianfei, and Phan, Manh-Huong
- Subjects
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PHASE transitions , *MAGNETIC transitions , *MAGNETIC cooling , *MAGNETIC hysteresis , *TRANSITION temperature , *MAGNETIC entropy , *MAGNETOCALORIC effects - Abstract
This work systematically investigated the effect of Fe content on the microstructure and magnetic transition behaviors of melt-extracting Mn-Fe-P-Si microwires. It was shown that the Fe content does not change the main phase of the samples, i.e. Fe 2 P compound, which decreased with the increasement of Fe content. The transition temperature (T tran) decreased from 311 to 245.5 K while the thermal hysteresis (T hys) increased from 9.5 to 22.5 K increasing Fe from 0.90 to 1.05. The samples realized the first order magnetic transition at x = 1.00 and 1.05, correspondingly the samples demonstrated large magnetic hysteresis losses (W y ,) and isothermal magnetic entropy change (− ∆ S iso peak ) at 5 T, 59.1 J kg−1 and 14.5 J kg−1 K−1 for the sample x =1.00, 58.4 J kg−1 and 15.8 J kg−1 K−1 for the sample x = 1.05. In contrast, the samples at x = 0.90 and 0.95 indicated second order transition character, and the W y and − ∆ S iso peak were much smaller, i.e. 14.8 J kg−1 and 10.3 J kg−1 K−1, 9.7 J kg−1 and 10.7 J kg−1 K−1 respectively for the samples x = 0.90 and 0.95. The largest effective refrigerant capacity (RCE , 293.7 J kg−1, 5 T) is found at x = 0.90. The reduced hysteresis and maintained competitive isothermal magnetic entropy change make the melt-extracting Mn-Fe-P-Si microwires with optimized Fe content as a promising magnetocaloric material family applied in real magnetic refrigeration applications. [Display omitted] • The MnFe x P 0.5 Si 0.5 microwires were fabricated by melt-extracted method. • The amount of Fe 2 P main phase increased with the Fe content x decreasing. • The phase transition character corresponds to second order with the Fe content < 1. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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