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- W2045500158 abstract "Using high-energy ball milling, nanostructured Pr2Fe17 powders can be obtained from their arc-melted bulk alloys. High-resolution X-ray and neutron powder diffraction experiments reveal that the Th2Zn17-type rhombohedral crystal structure is maintained, after milling for 10 h, with almost unchanged values for both crystalline lattice parameters (Δa; Δc < 0.05%) and vanishing mechanically induced microstrain (<0.1%). Although the mean crystalline size decreases down to 20 ± 3 nm, magnetovolume anomalies observed in pure Pr2Fe17 are still present with a significant volume decrease on heating from 5 up to 320 K. After the milling, a significant increase in the magnetic anisotropy, due to the drastic reduction in crystalline size, is observed, while the value of the magnetic moment seems to be increased slightly (5%). In addition, the magnetocaloric effect of bulk and nanostructured Pr2Fe17 has been investigated. The magnetic entropy change, |ΔSM|, decreases from 6.3 to 4.5 J kg−1 K−1 under an applied magnetic field μ0H = 5 T after the milling process. However, the width of the |ΔSM|(T) curve is substantially enlarged and hence the refrigerant capacity is enhanced. These findings make the iron-based nanostructured Pr2Fe17 powders interesting for applications in magnetic refrigeration at around room temperature." @default.
- W2045500158 created "2016-06-24" @default.
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- W2045500158 date "2009-04-01" @default.
- W2045500158 modified "2023-10-12" @default.
- W2045500158 title "Crystal structure, magnetocaloric effect and magnetovolume anomalies in nanostructured Pr2Fe17" @default.
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- W2045500158 doi "https://doi.org/10.1016/j.actamat.2008.12.014" @default.
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