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High magnetic-refrigeration performance of plate-shaped La0.5Pr0.5Fe11.4Si1.6 hydrides sintered in high-pressure H2 atmosphere.
- Source :
- Applied Physics Letters; 4/23/2015, Vol. 106 Issue 9, p1-4, 4p, 1 Diagram, 1 Chart, 3 Graphs
- Publication Year :
- 2015
-
Abstract
- La(Fe, Si)<subscript>13</subscript> 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<subscript>2</subscript> gas pressure of 50 MPa was employed to suppress the desorption of hydrogen atoms during the sintering process of plate-shaped La<subscript>0.5</subscript>Pr<subscript>0.5</subscript>Fe<subscript>11.4</subscript>Si<subscript>1.6</subscript> hydrides. At 330K, a high-density sintered thin plate shows a large magnetic-entropy change ΔS<subscript>m</subscript> of 15.5 J/kgK (106mJ/cm³K) for a field change of 2T. The volumetric DSm is almost twice as large as that of bonded La(Fe,Si)<subscript>13</subscript> 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- LANTHANUM compounds
MAGNETIC cooling
HYDRIDES
SINTERING
MAGNETIC entropy
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 106
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 101474744
- Full Text :
- https://doi.org/10.1063/1.4914006