| Title |
Synthesis and Magnetocaloric Effect of HoN Particles as Magnetic Refrigerant in Cryogenic Temperature by Microwave-Assisted Sol-Gel Method |
| Authors |
안종빈(Jong Bin Ahn); 김동수(Dongsoo Kim); 윤석영(Seog Young Yoon); 최철진(Chuljin Choi) |
| DOI |
https://doi.org/10.3365/KJMM.2016.54.4.275 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
ceramics; chemical synthesis; magnetic properties; thermal analysis; microwave chemistry; magnetocaloric effect |
| Abstract |
Rare-earth (RE) mono-nitrides can be used as magnetocaloric materials for the magnetic refrigerant for liquefying hydrogen. In this study, holmium nitride (HoN) particles were prepared by sol-gel method with microwave irradiation. HoN particles were successfully synthesized by 2-step heat treatment in N2 atmosphere form gel-type intermediate by microwave irradiation. X-ray diffraction patterns of the synthesized HoN particles exhibited the six sharp peaks in good agreement with each plane of crystallographic structure of HoN. Especially, the synthesized HoN particles reveal a high magnetic entropy change (△Sm) of 36.6 J/kgK in applied field of 5T at 14.2 K which is comparable with those of rare earth mono-nitrides by carbothermic reduction method or plasma arc discharge technique. |