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佟永丽,郭杰,任增鑫,徐志洁,孙乃坤.高压烧结时间及颗粒尺寸对片状LaFe11.44Si1.56氢化物块体结构及磁热效应的影响[J].稀有金属材料与工程(英文),2018,47(3):954~960.[Tong Yongli,Guo Jie,Ren Zengxin,Xu Zhijie and Sun Naikun.Effect of Particle Size and Sintering Duration on the Structure and Magnetocaloric Effect of Plate-shaped LaFe11.44Si1.56 Hydrides in High-pressure H2 Atmosphere[J].Rare Metal Materials and Engineering,2018,47(3):954~960.]
Effect of Particle Size and Sintering Duration on the Structure and Magnetocaloric Effect of Plate-shaped LaFe11.44Si1.56 Hydrides in High-pressure H2 Atmosphere
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Received:January 28, 2016  Revised:May 24, 2016
DOI:
Key words: room temperature magnetic refrigeration  magnetocaloric effect  high pressure  particle size  magnetic hysteresis
Foundation item:国家自然科学基金资助(项目号51261001); 辽宁省自然科学资助(项目号2013020105);沈阳市科学计划项目资助(项目号F13-316-1-39)
Author NameAffiliation
Tong Yongli,Guo Jie,Ren Zengxin,Xu Zhijie and Sun Naikun  
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Abstract:
      La(Fe,Si)13 hydride is regarded as one of the most promising room-temperature magnetic refrigerants. A typical active magnetic refrigerator machine requires thin plate-shaped refrigerants. In this work, plate-shaped LaFe11.44Si1.56 hydrides with different particle sizes were prepared by sintering in a high-pressure H2 atmosphere of 40MPa. Effect of particle size and sintering duration on the structure and magnetocaloric effect was investigated. Compared to the parent alloy, α-Fe contents of the sintered samples are increased and different particle sizes and sintering duration do not remarkably influence the precipitation of α-Fe. Upon increasing of particle size, Curie temperatures of sintered samples slightly increase and are shifted to above room temperature. Hysteresis of plate-shaped LaFe11.44Si1.56 hydrides has been almost eliminated due to the existence of micropores with a large size of distribution and small particle size, which reduces the internal strain during the process of the phase transitions. Compared with the sintered sample with particle size from 110 to 150μm, the hysteresis loss of the sintered sample with particle size smaller than 40μm is decreased by 35%, while the large magnetic-entropy ΔSm maintains. LaFe11.44Si1.56 thin plate-shaped hydride with particle size smaller than 40μm exhibits a large change ΔSm of 8.5J/kg.K(53mJ/cm3.K) for a field change of 1.5T at 345K.