J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (5): 848-854.DOI: 10.1016/j.jmst.2017.04.003
• Orginal Article • Previous Articles Next Articles
F. Wei, S. Ma*(), L. Yang, Y. Feng, J.Z. Wang, A. Hua, X.G. Zhao, D.Y. Geng, Z.D. Zhang
Received:
2016-11-10
Revised:
2016-12-12
Accepted:
2016-12-16
Online:
2018-05-10
Published:
2018-05-04
Contact:
Ma S.
F. Wei, S. Ma, L. Yang, Y. Feng, J.Z. Wang, A. Hua, X.G. Zhao, D.Y. Geng, Z.D. Zhang. A new scale for optimized cryogenic magnetocaloric effect in ErAl2@Al2O3 nanocapsules[J]. J. Mater. Sci. Technol., 2018, 34(5): 848-854.
Fig. 1. (a) Schematic picture of the crystalline structure of ErAl2 compound. (b) X-ray diffraction patterns of the prepared nanoparticles. The vertical lines represent the standard peak positions of ErAl2, ErAl3, Er2O3 and Al.
Fig. 2. TEM observation of ErAl2 nanoparticles (a) the morphology of the as-prepared ErAl2 nanopaticles; (b) the corresponding particle-size histogram; (c) a high-angle annular dark-field(HAADF) image and the corresponding EDS elemental color mappings showing (d) Er, (e) Al, and (f) Er, Al and O distribution.
Fig. 3. (a) A HRTEM image of a single nanocapsule showing a typical core-shell structure. (b) A schematic of ErAl2 core and Al2O3 shell. (c) XPS spectrum of the nanocapsules indicating the peak position shifting to lower binding energy with the increasing sputtering depth.
Fig. 4. (a) Zero-field-cooled(ZFC) and field-cooled (FC) magnetization curves between 5 and 50 K under an applied field of 100 Oe for S4. The inset shows the Curie temperature of 20 K for ErAl2 nanoparticles. (b) The hysteretic loops of S4 at 15 K showing typical superparamagnetic behavior. The inset shows zero coercivity. (c) The hysteretic loops of S4 at 5 K. The inset shows the existence of coercivity.
Fig. 5. (a) The isothermal magnetization curves of S4 from 5 K to 50 K under the field from 0 to 50 kOe. (b) Temperature dependence of the -ΔSM from 5 to 50 K under different magnetic field for S4. (c) ZFC-FC magnetization curves between 5 and 50 K under an applied field of 10 kOe for S4.
Fig. 6. (a) The 1/T dependence of -ΔSM from 10 K to 50 K showing the linear relationship between -ΔSM and 1/T. (b) β dependence of magnetic field from 10 kOe to 50 kOe.
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