20 0

Critical behavior and magnetocaloric effect of Mn4.75Ge3(Co, Fe)(0.25) alloys

Title
Critical behavior and magnetocaloric effect of Mn4.75Ge3(Co, Fe)(0.25) alloys
Author
윤종승
Keywords
Critical behavior; Magnetocaloric effect; Mn5Ge3
Issue Date
2017-03
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v. 696, page. 931-937
Abstract
The critical behavior and magnetocaloric effect of Mn5Ge3, Mn4.75Co0.25Ge3 and Mn4.75Fe0.25Ge3 were investigated. The critical exponents of beta = 0.368 and gamma = 1.312 for Mn5Ge3 were in good agreement with the values predicted by the 3D Heisenberg model whereas for Mn4.75Co0.25Ge3 (beta = 0.379, gamma = 1.037) and Mn4.75Fe0.25Ge3 (beta = 0.365, gamma = 1.055) there a large deviation for the gamma values from the Heisenberg model. Curie temperatures and magnetic entropy, Delta S-M, however, were in accordance with the beta values of the three alloys. The respective peak Delta S-M 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 Delta S-M - 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 Delta S-M - T curve to fields experimentally unavailable. (C) 2016 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/abs/pii/S0925838816339366?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/113318
ISSN
0925-8388; 1873-4669
DOI
10.1016/j.jallcom.2016.12.028
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE