Publication Date:
2015-03-03
Description:
La(Fe, Si) 13 hydride is regarded as one of the most promising room-temperature refrigerants. However, to use the alloys in an active magnetic regenerator machine, it is vital to prepare thin refrigerants. In this work, a high H 2 gas pressure of 50 MPa was employed to suppress the desorption of hydrogen atoms during the sintering process of plate-shaped La 0.5 Pr 0.5 Fe 11.4 Si 1.6 hydrides. At 330 K, a high-density sintered thin plate shows a large magnetic-entropy change Δ S m of 15.5 J/kg K (106 mJ/cm 3 K) for a field change of 2 T. The volumetric Δ S m is almost twice as large as that of bonded La(Fe,Si) 13 hydrides. Favorably, hysteresis is almost absent due to the existence of micropores with a porosity of 0.69% which has been analyzed with high-resolution X-ray microtomography.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
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