Large magnetic entropy change and adiabatic temperature rise of Fe85B12La3 amorphous alloy

2020 ◽  
Vol 583 ◽  
pp. 412014
Author(s):  
B.Z. Tang ◽  
M.N. Song ◽  
L.W. Huang ◽  
D. Ding ◽  
L. Xia
Keyword(s):  
Amorphous Alloy ◽  
Temperature Rise ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Adiabatic Temperature ◽  
Magnetic Entropy ◽  
Adiabatic Temperature Rise

scholarly journals Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd60Co40 Amorphous Alloy

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1741
Author(s):  
Ping Han ◽  
Ziyang Zhang ◽  
Jia Tan ◽  
Xue Zhang ◽  
Yafang Xu ◽  
...  
Keyword(s):  
Amorphous Alloy ◽  
Magnetocaloric Effect ◽  
Magnetic Entropy Change ◽  
Amorphous Matrix ◽  
Thermodynamic Cycle ◽  
Entropy Change ◽  
Cooling Power ◽  
Magnetic Entropy ◽  
Amorphous Precursor ◽  
Space Group

To investigate the effect of crystallization treatment on the structure and magnetocaloric effect of Gd60Co40 amorphous alloy, the melt-spun ribbons were annealed at 513 K isothermally for 20, 40 and 60 min. The results indicate that, with increasing annealing time, the Gd4Co3 (space group P63/m) and Gd12Co7 (space group P21/c) phases precipitated from the amorphous precursor in sequence. In particular, in the samples annealed for 40 and 60 min, three successive magnetic transitions corresponding to the phases of Gd4Co3, Gd12Co7 and remaining amorphous matrix were detected, which induced an overlapped broadened profile of magnetic entropy change (|ΔSM|) versus temperature. Under magnetic field changing from 0 to 5 T, |ΔSM| values of 6.65 ± 0.1 kg−1·K−1 and 6.44 ± 0.1 J kg−1·K−1 in the temperature spans of 180–196 K and 177–196 K were obtained in ribbons annealed for 40 and 60 min, respectively. Compared with the fully amorphous alloy, the enhanced relative cooling power and flattened magnetocaloric effect of partially crystallized composites making them more suitable for the Ericsson thermodynamic cycle.

Achieving better glass-forming ability and magnetocaloric effect in the minor Zr-substituted Gd50Co50 amorphous alloy

2018 ◽  
Vol 32 (08) ◽  
pp. 1850085
Author(s):  
Li Yan Ma ◽  
Liang Hua Gan ◽  
Lei Xia ◽  
JiaZheng Zhang ◽  
Ding Ding
Keyword(s):  
Amorphous Alloy ◽  
Magnetocaloric Effect ◽  
Melt Spinning ◽  
Magnetic Entropy Change ◽  
Thermodynamic Cycle ◽  
Entropy Change ◽  
Glass Forming Ability ◽  
Magnetic Entropy ◽  
Glass Forming ◽  
Amorphous Ribbons

The glass-forming ability (GFA) and magnetic properties of the minor Zr-substituted Gd[Formula: see text]Co[Formula: see text] amorphous alloy were investigated. The Gd[Formula: see text]Co[Formula: see text]Zr2 amorphous ribbons prepared by melt-spinning show better GFA. With increasing minor Zr addition, the Gd[Formula: see text]Co[Formula: see text]Zr2 amorphous ribbons possessed higher magnetic entropy change peak ([Formula: see text]S[Formula: see text] = 3.9 Jkg[Formula: see text]K[Formula: see text], under 5 T) but lower Curie temperature (T[Formula: see text] = 231 K) than the Gd[Formula: see text]Co[Formula: see text] amorphous alloy. The mechanism for the improved GFA, magnetocaloric effect (MCE) and the decrease in T[Formula: see text] was investigated. Finally, combined with other Gd-based amorphous ribbons, the Gd[Formula: see text]Co[Formula: see text]Zr2 amorphous alloy was employed to construct amorphous composites to achieve a table-like magnetic entropy change profile, which can provide optimal efficiency when utilizing an Ericsson thermodynamic cycle.

Enhanced Curie temperature and magnetic entropy change of Gd63Ni37 amorphous alloy by Co substitution

2019 ◽  
Vol 115 ◽  
pp. 106614 ◽  
Author(s):  
M.N. Song ◽  
L.W. Huang ◽  
B.Z. Tang ◽  
D. Ding ◽  
X. Wang ◽  
...  
Keyword(s):  
Amorphous Alloy ◽  
Curie Temperature ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Co Substitution

Enhanced Curie temperature and magnetic entropy change of Gd50Co50−xNix amorphous alloys

2019 ◽  
Vol 34 (04) ◽  
pp. 2050050 ◽  
Author(s):  
M. N. Song ◽  
L. W. Huang ◽  
B. Z. Tang ◽  
D. Ding ◽  
Q. Zhou ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloy ◽  
Curie Temperature ◽  
Binary Alloy ◽  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Ni Addition

Small amount of Ni was added in the [Formula: see text] binary alloy to replace the Co element for improving the formability and magnetic properties of the binary amorphous alloy. It was found that the glass formability of the [Formula: see text] amorphous alloy was significantly improved by Ni addition. The Curie temperature [Formula: see text] of the [Formula: see text] metallic glasses decreases with the Ni addition, and the maximum magnetic entropy change [Formula: see text] was also improved. The mechanism for the effect of adding a small quantity of Ni on the [Formula: see text] and [Formula: see text] of the [Formula: see text] amorphous alloy was studied.

Nearly constant magnetic entropy change and adiabatic temperature change in PrGa compound

2014 ◽  
Vol 115 (17) ◽  
pp. 17A938 ◽  
Author(s):  
X. Q. Zheng ◽  
J. Chen ◽  
Z. Y. Xu ◽  
Z. J. Mo ◽  
F. X. Hu ◽  
...  
Keyword(s):  
Temperature Change ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Adiabatic Temperature ◽  
Magnetic Entropy ◽  
Adiabatic Temperature Change
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