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Title: High magnetic-refrigeration performance of plate-shaped La{sub 0.5}Pr{sub 0.5}Fe{sub 11.4}Si{sub 1.6} hydrides sintered in high-pressure H{sub 2} atmosphere

La(Fe, Si){sub 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{sub 2} gas pressure of 50 MPa was employed to suppress the desorption of hydrogen atoms during the sintering process of plate-shaped La{sub 0.5}Pr{sub 0.5}Fe{sub 11.4}Si{sub 1.6} hydrides. At 330 K, a high-density sintered thin plate shows a large magnetic-entropy change ΔS{sub m} of 15.5 J/kg K (106 mJ/cm{sup 3 }K) for a field change of 2 T. The volumetric ΔS{sub m} is almost twice as large as that of bonded La(Fe,Si){sub 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.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4]
  1. School of Science, Shenyang Ligong University, Shenyang 110159 (China)
  2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 (China)
  3. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018 (China)
  4. Baotou Research Institute of Rare Earths, Baotou 014030 (China)
Publication Date:
OSTI Identifier:
22412757
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DESORPTION; ENTROPY; HYDROGEN; HYSTERESIS; IRON COMPOUNDS; LANTHANUM HYDRIDES; PERFORMANCE; PLATES; POROSITY; PRASEODYMIUM COMPOUNDS; PRESSURE DEPENDENCE; REFRIGERANTS; REFRIGERATION; SILICON COMPOUNDS; SINTERING; TEMPERATURE RANGE 0273-0400 K; X RADIATION