期刊论文详细信息
JOURNAL OF ALLOYS AND COMPOUNDS 卷:777
Magnetic and magnetocaloric properties of DyCo2Cx alloys
Article
Wang, C. L.1,2,3  Liu, J.1,4,7  Mudryk, Y.1  Zhu, Y. J.5  Fu, B.6  Long, Y.2  Pecharsky, V. K.1,4 
[1] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA
[2] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[3] East China Normal Univ, Key Lab Polar Mat & Devices MOE, Shanghai Key Lab Multidimens Informat Proc, Dept Elect Engn, 500 Dongchuan Rd, Shanghai 200241, Peoples R China
[4] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA
[5] Chinese Acad Ordnance Sci, Ningbo Branch, Ningbo 315103, Zhejiang, Peoples R China
[6] Tianjin Univ Technol, Sch Mat Sci & Engn, Tianjin 300384, Peoples R China
[7] Seagate Technol, Bloomington, MN USA
关键词: Magnetocaloric effect;    Entropy change;    Magnetic cooling;    Phase transition;    Intermetallic compound;    Carbon doping;   
DOI  :  10.1016/j.jallcom.2018.10.169
来源: Elsevier
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【 摘 要 】

The magnetic and magnetocaloric properties of DyCo2Cx (x = 0, 0.05, 0.1, and 0.15) alloys were investigated. The results show that the Curie temperature (TC) of the DyCo2Cx alloys increases with increasing C content, from 136 K (x = 0) to 152 K (x = 0.15), but the lattice parameter a of DyCo2Cx exhibits a maximum at x = 0.05. The suppression of the ac susceptibility of DyCo2Cx at low temperature indicates the enhancement of the domain wall pinning effect by carbon doping. The positive slops of the Arrott plots of the doped compounds indicate that the phase transition is second order for the carbon-doped alloys, and the maximum value of the isothermal magnetic entropy change (Delta S-M) for the magnetic field change of 50 kOe decreases from -13.9 J/kg.K (x = 0) to -7.8 J/kg.K (x = 0.15). The relative cooling power (RCP) of DyCo2Cx is nearly the same in all studied alloys, while the temperature-averaged entropy change over 10 K temperature span, TEC(10), indicates decreasing magnetocaloric performance of carbon doped materials. (C) 2018 Elsevier B.V. All rights reserved.

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