Magnetocaloric refrigerant with wide operating temperature range based on Mn5-xGe3(Co,Fe)(x) composite
- Authors
- Kim, Yongdeok; Kang, Ki Hoon; Kim, Ju Hwan; Kim, Eun Jeong; Choi, Kwangseok; Han, Won Bae; Kim, Hee-Soo; Oh, Yoong; Yoon, Chong Seung
- Issue Date
- Sep-2015
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Magnetocaloric effect; Magnetic refrigeration; Mn5Ge3; Composite refrigerant
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.644, pp.464 - 469
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 644
- Start Page
- 464
- End Page
- 469
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/24881
- DOI
- 10.1016/j.jallcom.2015.05.061
- ISSN
- 0925-8388
- Abstract
- The Curie temperature of Mn5Ge3 was raised or lowered by alloying the compound with Fe or Co; hence, the temperature at which maximum magnetocaloric effect manifested was easily manipulated by forming Mn5-xGe3(Co,Fe)(x), alloys to ultimately develop a composite magnetic refrigerant consisting of multiple Mn5Ge3 - based alloys. The composite refrigerant was designed to produce a table-like Delta S-M-T curve and to maximize the RC value near room temperature. Linear combination of the Delta S-M-T curves for the constituent materials showed that a composite composed of physical mixture of four different Mn5Ge3-based compounds: Mn5Ge3, Mn5.1Ge2.9, Mn4.75Co0.25Ge3 and Mn4.75Fe0.25Ge3, generated an optimal Delta S-M-T curve with a table-like shape. The composite refrigerant with refrigeration capacity of 52 J kg(-1), peak entropy change at 300 K, and operating temperature range of 45 K under Delta H = 10 kOe was suitable for room-temperature magnetic refrigeration. Moreover, by changing the relative fraction of each constituent material in the composite, it was shown that the operating temperature range could be fine-tuned as needed. The calculated Delta S-M-T curve for the composite refrigerant by linear combination reasonably well matched the experimental Delta S-M-Tcurve estimated from the M-H curves of the composite refrigerant, suggesting that the simple linear combination of the experimental Delta S-M-T curves can be used to predict the performance of the composite magnetic refrigerants whose MCE was originated from the second order magnetic transition. In conclusion, being rare-earth free and lacking thermal or magnetic hysteresis, the Mn5Ge3 - based composite can be a competitive candidate magnetic refrigerant material operating at room temperature in terms of both economy and reliability compared to the giant MCE materials such as Gd - based intermetallic compounds or Heusler alloys. (C) 2015 Elsevier B.V. All rights reserved.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - 서울 공과대학 > 서울 신소재공학부 > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/24881)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.