한국수소및신에너지학회논문집 (Journal of Hydrogen and New Energy)

  • 제25권6호
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  • Pages.594-601
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  • 2014
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  • 1738-7264(pISSN)
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  • 2288-7407(eISSN)
한국수소및신에너지학회 (The Korean Hydrogen and New Energy Society)
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수소재액화를 위한 자기냉매용 HoN 나노분말 합성 및 자기열량효과 연구

Study on the Synthesis of HoN Nanoparticles and Magnetocaloric Effect as Magnetic Refrigerant for Hydrogen Re-Liquefaction

  • 김동수 (재료연구소 분말/세라믹 연구본부) ;
  • 안종빈 (재료연구소 분말/세라믹 연구본부) ;
  • 장세훈 (재료연구소 분말/세라믹 연구본부) ;
  • 정국채 (재료연구소 분말/세라믹 연구본부) ;
  • 김종우 (재료연구소 분말/세라믹 연구본부) ;
  • 최철진 (재료연구소 분말/세라믹 연구본부)
  • Kim, Dongsoo (Powder & Ceramics Division, Korea Institute of Materials Science) ;
  • Ahn, Jongbin (Powder & Ceramics Division, Korea Institute of Materials Science) ;
  • Jang, Sehoon (Powder & Ceramics Division, Korea Institute of Materials Science) ;
  • Chung, Kookchae (Powder & Ceramics Division, Korea Institute of Materials Science) ;
  • Kim, Jongwoo (Powder & Ceramics Division, Korea Institute of Materials Science) ;
  • Choi, Chuljin (Powder & Ceramics Division, Korea Institute of Materials Science)
  • 투고 : 2014.09.24
  • 심사 : 2014.12.31
  • 발행 : 2014.12.30
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초록

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 ($N_2$) 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 $N_2$ was systematically varied from 0 to 28,000 Pa in order to obtain single phase of HoN with minimal impurities. Magnetic entropy change (${\Delta}S_m$) was calculated with data set measured by PPMS (Physical Property Measurement System). The as-synthesized HoN particles have shown a magnetic entropy change ${\Delta}S_m$) 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.

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