Critical behavior and magnetocaloric effect of Mn4.75Ge3(Co, Fe)(0.25) alloys
- Authors
- Kang, Ki Hoon; Kim, Ju Hwan; Oh, Yoong; Kim, Eun Jeong; Yoon, Chong Seung
- Issue Date
- Mar-2017
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Critical behavior; Magnetocaloric effect; Mn5Ge3
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.696, pp.931 - 937
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 696
- Start Page
- 931
- End Page
- 937
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/20524
- DOI
- 10.1016/j.jallcom.2016.12.028
- ISSN
- 0925-8388
- Abstract
- The critical behavior and magnetocaloric effect of Mn5Ge3, Mn4.75Co0.25Ge3 and Mn4.75Fe0.25Ge3 were investigated. The critical exponents of β = 0.368 and γ = 1.312 for Mn5Ge3 were in good agreement with the values predicted by the 3D Heisenberg model whereas for Mn4.75Co0.25Ge3 (β = 0.379, γ = 1.037) and Mn4.75Fe0.25Ge3 (β = 0.365, γ = 1.055) there a large deviation for the γ values from the Heisenberg model. Curie temperatures and magnetic entropy, ΔSM, however, were in accordance with the β values of the three alloys. The respective peak ΔSM for Mn5Ge3, Mn4.75Co0.25Ge3 and Mn4.75Fe0.25Ge3 was 4.96, 4.67, and 5.11 J/kg K under an external field change of 3 T. The ΔSM – T curves for the three alloys collapsed onto a single master curve regardless of the composition and the applied field. It was also demonstrated that the universal behavior with the critical exponents can be used to extrapolate the ΔSM – T curve to fields experimentally unavailable.
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