scholarly journals Effect of Co/Ni Substituting Fe on Magnetocaloric Properties of Fe-Based Bulk Metallic Glasses

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 950
Author(s):  
Jia Guo ◽  
Lei Xie ◽  
Cong Liu ◽  
Qiang Li ◽  
Juntao Huo ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Magnetic Entropy Change ◽  
Bulk Metallic Glasses ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Glass Forming ◽  
Magnetic Refrigerant ◽  
Magnetocaloric Properties ◽  
Curie Temperature Tc

In this work, Fe80-xMxP13C7 (M = Co, Ni; x = 0, 5 and 10 at.%) bulk metallic glasses (BMGs) were prepared, and the effect of the Co/Ni elements substitution for Fe on the magnetocaloric properties of Fe80P13C7 BMG has been investigated systematically. The Curie temperature (TC) of the present Fe-based BMGs increases with the substitution of Fe by Co/Ni. The magnetic entropy change (ΔSM) of the present Fe-based BMGs increases first and then decreases with the increase of Fe substituted by Co, but monotonically decreases with the increase of Fe substituted by Ni. Among the present Fe-based BMGs, the Fe75Co5P13C7 BMG exhibits the maximum ΔSM value of 5.21 J kg−1 K−1 at an applied field of 5 T, which is the largest value among Fe-based amorphous alloys without any rare earth elements reported so far. The present Fe-based BMGs exhibit the large glass forming ability, tunable TC and enhanced ΔSM value, which are beneficial for magnetic refrigerant materials.

scholarly journals Compositional Dependence of Curie Temperature and Magnetic Entropy Change in the Amorphous Tb–Co Ribbons

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1002
Author(s):  
Xin Wang ◽  
Ding Ding ◽  
Li Cui ◽  
Lei Xia
Keyword(s):  
Curie Temperature ◽  
Linear Relationship ◽  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Magnetic Entropy Change ◽  
Alloy Composition ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Compositional Dependence ◽  
Curie Temperature Tc

The Curie temperature (Tc) and magnetic entropy change (−ΔSm), and their relationship to the alloy composition of Tb–Co metallic glasses, were studied systematically in this paper. It was found that, in contrast to the situation in amorphous Gd–Co ribbons, the dependence of Tc on Tb content and the maximum −ΔSm vs. Tc -2/3 plots in Tb–Co binary amorphous alloys do not follow a linear relationship, both of which are supposed to be closely related to the non-linear compositional dependence of Tb–Co interaction due to the existence of orbital momentum in Tb.

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.

scholarly journals Roles of hydrogenation, annealing and field in the structure and magnetic entropy change of Tb-based bulk metallic glasses

AIP Advances ◽  
2013 ◽  
Vol 3 (3) ◽  
pp. 032134 ◽  
Author(s):  
Qiang Luo ◽  
Björn Schwarz ◽  
Norbert Mattern ◽  
Jun Shen ◽  
Jürgen Eckert
Keyword(s):  
Metallic Glasses ◽  
Magnetic Entropy Change ◽  
Bulk Metallic Glasses ◽  
Entropy Change ◽  
Magnetic Entropy

scholarly journals Influence of Sr Doping on Magnetic and Magnetocaloric Properties of Nd0.6Sr0.4MnO3

2020 ◽  
Vol 36 (1) ◽  
Author(s):  
Thi Anh Ho ◽  
Huyen Ngoc Nguyen ◽  
Thang Duc Pham
Keyword(s):  
Magnetic Field ◽  
Magnetic Entropy Change ◽  
Magnetic Order ◽  
Entropy Change ◽  
Solid State Reaction Method ◽  
Cooling Power ◽  
Magnetic Entropy ◽  
Magnetocaloric Properties ◽  
Reduced Temperature ◽  
Curie Temperature Tc

Nd0.6Sr0.4MnO3 sample is fabricated by a solid-state reaction method and its magnetic, magnetocaloric properties are investigated. The Curie temperature, TC, at which a ferromagnetic-paramagnetic transition occurs is about 270 K. Based on an analysis using the Banejee’s criterion for the experiment results of magnetic-field dependences of magnetization and the universal curves of the normalized entropy change versus reduced temperature, we assess magnetic order existing in this sample. Furthermore, the maximum magnetic entropy change, which occurs near TC, measured at a magnetic field span of 50 kOe is about 6.0 J/kg.K corresponds to relative cooling power of 250 J/kg. These values are comparable to those of other manganites.

Magnetocaloric Properties of Rapidly Solidified Ni51.1Mn31.2In17.7 Heusler Alloy Ribbons

2009 ◽  
Vol 1200 ◽  
Author(s):  
Jose Sánchez Llamazares ◽  
Blanca Hernando ◽  
Víctor Prida ◽  
Carlos García ◽  
Caroline Ross
Keyword(s):  
Melt Spinning ◽  
Magnetic Entropy Change ◽  
Magnetic Transition ◽  
Entropy Change ◽  
Single Step ◽  
Magnetic Entropy ◽  
Refrigerant Capacity ◽  
Magnetocaloric Properties ◽  
Room Temperature Magnetic Refrigeration ◽  
Rapidly Solidified

AbstractMagnetic entropy change and refrigerant capacity have been determined for a field change of 20 kOe around the second-order magnetic transition of austenite in as-quenched Ni51.1Mn31.2In17.7 alloy ribbons produced by melt spinning technique. Samples crystallize in a single-phase austenite with the highly ordered L21-type crystal structure and a Curie temperature of 275 K. The material shows a maximum magnetic entropy change of ΔSMmax= - 1.7 Jkg-1K-1, an useful working temperature range of 78 K (δTFWHM) and a refrigerant capacity of RC=132 Jkg-1 (RC= │ΔSMmax│ x δTFWHM). The considerable RC value obtained together with the fabrication via a single-step process make austenitic Ni-Mn-In ribbons of potential interest as magnetic refrigerants for room temperature magnetic refrigeration.

The Magnetocaloric Properties of Gd5Si4 Alloy Prepared by the New Method

2014 ◽  
Vol 4 (3) ◽  
pp. 595-600 ◽  
Author(s):  
Z. Momeni Larimi
Keyword(s):  
Magnetic Entropy Change ◽  
Entropy Change ◽  
New Method ◽  
Second Phase ◽  
Arc Furnace ◽  
Magnetic Entropy ◽  
Orthorhombic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetocaloric Properties

We report on a new method for preparation the magnetocaloric alloy Gd5Si4. By mechanical alloying under argonatmosphere and then melting sample by arc furnace, we produced the Gd5Si4 alloy. The structure and magnetothermalproperties of the alloy have been investigated with the help of powder X-ray diffraction and magnetization measurements.This compound crystallized in the orthorhombic structure with space group pnma. In X-ray powder diffraction pattern, aminor orthorhombic GdSi2 phase was observed as a second phase. For this compound, the second order phase transitionwas observed. The maximum isothermal magnetic entropy change of the Gd5Si4 compound at 348K was found to be -10J/(kg K) in an applied field of 0.5T.

Improvement of glass forming ability and magnetic properties of a Gd55Al20Co25 bulk metallic glass by minor Fe substitution for Co

2015 ◽  
Vol 29 (31) ◽  
pp. 1550198 ◽  
Author(s):  
Q. Guan ◽  
P. Yu ◽  
K. C. Chan ◽  
L. Xia
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Glass Forming Ability ◽  
Magnetic Entropy ◽  
Casting Method ◽  
Glass Forming ◽  
Caloric Effect ◽  
Fe Substitution

[Formula: see text] bulk metallic glass (BMG) exhibits good glass forming ability (GFA) and excellent magneto-caloric effect (MCE). In order to further improve the GFA and MCE of the [Formula: see text] BMG, we attempted to add small amount of Fe as a replacement of Co in the BMG and obtained [Formula: see text] glassy rod using a traditional suction casting method. The [Formula: see text] BMG shows a better GFA and MCE than the [Formula: see text] BMG. The magneto-caloric behavior of the [Formula: see text] BMG was investigated by studying the field dependence of the magnetic entropy change peak and the refrigeration capacity.

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.

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