Magnetic properties and magnetocaloric effect of HoCo3B2 compound
X. Q. Zheng,
J. W. Xu,
H. Zhang,
J. Y. Zhang,
S. G. Wang,
Y. Zhang,
Z. Y. Xu,
L. C. Wang,
B. G. Shen
Affiliations
X. Q. Zheng
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
J. W. Xu
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
H. Zhang
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
J. Y. Zhang
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
S. G. Wang
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
Y. Zhang
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences & University of Chinese Academy of Sciences, Beijing 100190, P. R. China
Z. Y. Xu
National Institute of Metrology, Beijing 100029, P. R. China
L. C. Wang
Department of Physics, Capital Normal University, Beijing 100048, P. R. China
B. G. Shen
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences & University of Chinese Academy of Sciences, Beijing 100190, P. R. China
A sample of HoCo3B2 compound was synthesized, and the magnetic and MCE properties were investigated. Compound shows a change corresponding to R-R (R = rare earth) sublattice magnetic order transition and the transition temperature is determined to be 11.8 K (TC). The characteristic of Arrott plots with positive slope around TC was observed, indicating a second-order phase transition. Based on isothermal magnetization data, together with Maxwell’s relationship, the magnetic entropy change (-ΔSM) was calculated. The maximum -ΔSM reaches 7.8, 12.7 and 14.4 J/kg K for field range of 0-2 T, 0-5 T and 0-7 T, respectively. Accordingly, the value of RC (refrigerant capacity) is 99, 289 and 432 J/kg for above field ranges. The large MCE of HoCo3B2 compound indicates its potential application for magnetic refrigeration in low temperature range.
