수소재액화를 위한 자기냉매용 HoN 나노분말 합성 및 자기열량효과 연구

김동수; 안종빈; 장세훈; 정국채; 김종우; 최철진

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자료유형: 학술저널

저자정보: 김동수 안종빈 장세훈 정국채 김종우 최철진

저널정보: 한국수소및신에너지학회 한국수소및신에너지학회논문집 한국수소 및 신에너지학회 논문집 제25권 제6호

발행연도: 2014.12

수록면: 594 - 601 (8page)

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2014

수소재액화를 위한 자기냉매용 HoN 나노분말 합성 및 자기열량효과 연구

김동수 , 안종빈 , 장세훈 외 3명 한국수소및신에너지학회논문집 2014.12 학술저널

HoN 나노입자 합성 및 자기열량 효과 연구

김동수 , 안종빈 , 정국채 외 1명 한국자기학회 학술연구발표회 논문개요집 2014.05 학술대회자료

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Rare-earth (RE) nitrides can be used as magnetocaloric materials in low temperature. They exhibit ferromagnetism and have Curie temperature in the region from 6 to 70 K. In this study, Holmium nitride (HoN) nano particles were prepared through plasma arc discharge technique and their magnetocaloric properties were studied. Nitrogen gas (N2) was employed as an active element for arc discharge between two electrodes maintained at a constant current. Also, it played an important role not only as a reducing agent but also as an inevitable source of excited nitrogen molecules and nitrogen ions for the formation of HoN phase. Partial pressure of N2 was systematically varied from 0 to 28,000 Pa in order to obtain single phase of HoN with minimal impurities. Magnetic entropy change (△S(m)) was calculated with data set measured by PPMS (Physical Property Measurement System). The as-synthesized HoN particles have shown a magnetic entropy change (△S(m)) of 27.5 J/kgK in applied field of 50,000 Oe at 14.2 K thereby demonstrating its ability to be applied as an effective magnetic refrigerant towards the re-liquefaction of hydrogen.

#수소액화 #자기냉각 #자기열량효과 #플라즈마아크방전 #홀뮴나이트라이드 #Holmium Nitride #Liquefaction of hydrogen #Magnetic cooling #Magnetocaloric effect #Plasma arc discharge

참고문헌 (18)

참고문헌 신청

T. Nakagawa / 2006 / Magnetocaloric effects of ferromagnetic erbium mononitride / Journal of Alloys and Compounds 408:187~190

Takao A. Yamamoto / 2004 / Magnetocaloric effect of rare earth mono-nitrides, TbN and HoN / Journal of Alloys and Compounds 376:17~22

M. H. Phan / 2007 / Review of the magnetocaloric effect in manganite materials / Journal of Magnetism and Magnetic Materials 308:325~340

V. K. Pecharsky / 1997 / Giant Magnetocaloric Effect in Gd5(Si2Ge2) / Physical Review Letters 78(23):4494~4497

F. X. Hu / 2001 / Influence of negative lattice expansion and metamagnetic transition on magnetic entropy change in the compound LaFe11. 4Si1. 6 / Applied Physics Letters 78(23):3675~3677