Phase transitions and magnetocaloric effect of Ni1.7Co0.3Mn1+xAl1-x Heusler alloys
- Title
- Phase transitions and magnetocaloric effect of Ni1.7Co0.3Mn1+xAl1-x Heusler alloys
- Author
- 윤종승
- Keywords
- Magnetocaloric effect; NiCoMnAl alloy; Martensitic transformation
- Issue Date
- 2013-04
- Publisher
- ELSEVIER SCIENCE SA
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, Apr 2013, 557, P.265-269
- Abstract
- Structural and magnetic phase transitions of Ni1.7Co0.3Mn1+xAl1-x (x = 0.22-0.3) alloys were characterized to evaluate the magnetocaloric effect (MCE) of the alloys. The Curie temperature remained at similar to 360 K regardless of the composition whereas the Al fraction determined the temperature and extent of the martensitic transition. The alloy with x = 0.26 had the highest peak magnetic entropy change (vertical bar Delta S-M vertical bar(pk)) of 2.1 J kg(-1) K-1 and refrigerant capacity (RC) of 49 J kg(-1) with Delta H = 10 kOe, originating from the martensitic transformation. The vertical bar Delta S-M vertical bar(pk) and RC values were comparable to those of other Ni-Mn-X alloys. The alloy with x = 0.3 may also serve as a magnetic refrigerant near room temperature in spite of its relatively low vertical bar Delta S-M vertical bar(pk) and RC values. Our result suggests that it should be possible to fine-tune the composition of the quaternary NiCoMnAl alloy to attain optimal magnetocaloric effect near room temperature. (c) 2013 Elsevier B.V. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S0925838813000212?via%3Dihubhttp://hdl.handle.net/20.500.11754/44013
- ISSN
- 0925-8388
- DOI
- 10.1016/j.jallcom.2012.12.163
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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