Abstract
Plate-shaped La0.6Pr0.4Fe11.4Si1.6B0.2Hx bulk samples have been achieved with sintering in a high-purity H2 atmosphere at 50 MPa. The effect of B-doping on the structure, magnetism and magnetocaloric properties of the plate-shaped hydrides has been systematically explored. The results show that B-doping unfavorably leads to a remarkable increase of Fe2B during the sintering process and has not helped much in the 1:13 phase stabilization and/or in the magnetocaloric properties. At 340 K, a high-density sintered thin plate shows a large magnetic-entropy change ΔSm of 16.2 J/kg·K and a favorable small hysteresis of 0.6 J/kg for a field change from 0 to 5 T. High-resolution X-ray microtomography analysis shows that micropores exist in the thin plates causing a porosity of 0.26% and leading to a remarkable reduction of the hysteresis. This work opens an effective route for synthesizing thin magnetic refrigerants of La(Fe, Si)13Hx hydrides.
Highlights
Effect of B-doping on the structure and magnetocaloric properties of plate-shaped La0.6Pr0.4Fe11.4Si1.6Hx sintered in high-pressure H2 atmosphere
Lovell et al demonstrated the importance of sample shape in terms of engineering the hysteretic behavior for giant magnetocaloric effect (MCE) material beyond the obvious role of demagnetization.[9]
Thin plates of La0.6Pr0.4Fe11.4Si1.6B0.2Hx have been fabricated in a high-pressure H2 atmosphere and the effect of B-doping on the precipitation of α-Fe, the magnetism and the MCE of the plate-shaped hydrides are systematically explored
Summary
Effect of B-doping on the structure and magnetocaloric properties of plate-shaped La0.6Pr0.4Fe11.4Si1.6Hx sintered in high-pressure H2 atmosphere. In our previous work,[13] La0.5Pr0.5Fe11.4Si1.6Hx thin plates with high magnetic-refrigeration performance were prepared by sintering in a high-pressure H2 atmosphere of 50 MPa to suppress the desorption of hydrogen.
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