Refrigerant Capacity and Magnetocaloric Effect on LaFe11.1Co0.8Si1.1BX Alloys

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.84-85.667 ◽

2011 ◽

Vol 84-85 ◽

pp. 667-670

Author(s):

Guo Qiu Xie

Keyword(s):

Magnetocaloric Effect ◽

Room Temperature ◽

Magnetic Entropy Change ◽

Entropy Change ◽

Magnetic Entropy ◽

Field Change ◽

Refrigerant Capacity ◽

Structure Phase ◽

Magnetic Field Change ◽

Cubic Structure

In this paper, we report on the structure, magnetic properties and magnetocaloric effect in NaZn13-type LaFe11.1Co0.8Si1.1Bxalloys close to room temperature. The stable NaZn13cubic structure phase (space group isFm-3c) can easily obtained by annealing at 1080 °C for 225 hours. The maximal values of magnetic entropy change for LaFe11.1Co0.8Si1.1Bx(x=0.2, 0.25) were found to be 5.3 and 5.9 J/kg K at Curie temperature for a magnetic field change in 0-1.5 T, respectively. The calculated refrigerant capacity for a field change in 0–1.5 T is about 147 and 107 J/kg K, for LaFe11.1Co0.8Si1.1B0.2and LaFe11.1Co0.8Si1.1B0.25respectively, which is as larger as those of Gd(99.3%) alloy

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The Influence of the Purity of Gd on the Magnetocaloric Effect in Gd5Si2-XGe2-XZn2x Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.685.311 ◽

2011 ◽

Vol 685 ◽

pp. 311-315

Author(s):

Zhi Zeng ◽

Xue Zhen Wang ◽

Jian Huang ◽

Jie Xiang ◽

Xue Ling Hou

Keyword(s):

Magnetic Field ◽

External Magnetic Field ◽

Magnetocaloric Effect ◽

Curie Point ◽

Magnetic Entropy Change ◽

Entropy Change ◽

Magnetic Entropy ◽

Field Change ◽

Magnetic Field Change ◽

Giant Magnetocaloric Effect

Gd5Si2Ge2-based alloys can exhibit a giant magnetocaloric effect (GMCE) which gives them the potential use in the cooling technologies[1].Through this studies, it can be found that the purity of Gd had a great impact on the magnetocaloric effect in Gd5Si2-xGe2-xZn2x alloys. When 3N Gd used and 2x=0.01, Gd5Si2-xGe2-xZn2x around the curie point of 280k get the maximum magnetic entropy change of 14.0 J/(Kg.K) under the external magnetic field change from 0 to 1T, but when 2N Gd used and 2x=0.05, Gd5Si2-xGe2-xZn2x around the curie point of 284.2k under the external magnetic field change 1T get the maximum magnetic entropy change 6.65 J/(Kg.K).

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Large Isothermal Magnetic Entropy Change after Hydrogen Absorption into La0.5Pr0.5(Fe0.88Si0.12)13

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.26-28.577 ◽

2007 ◽

Vol 26-28 ◽

pp. 577-580

Author(s):

S. Fujieda ◽

A. Fujita ◽

Kazuaki Fukamichi

Keyword(s):

Hydrogen Absorption ◽

Room Temperature ◽

Magnetic Entropy Change ◽

Entropy Change ◽

Partial Substitution ◽

Magnetic Entropy ◽

Field Change ◽

Maximum Value ◽

Magnetic Field Change ◽

Curie Temperature Tc

The influences of hydrogen absorption on the Curie temperature TC and the isothermal magnetic entropy change for La0.5Pr0.5(Fe0.88Si0.12)13 have been investigated, because the magnetocaloric effects have been confirmed to be enhanced after a partial substitution of Pr for La in La(Fe0.88Si0.12)13. The value of TC for La0.5Pr0.5(Fe0.88Si0.12)13Hy increases from 185 to 324 K with increasing y from 0 to 1.6. The maximum value of the isothermal magnetic entropy change ,Sm MAX is slightly decreased by hydrogen absorption. However, ,Sm MAX = -26 J/kg K in a magnetic field change of 5 T for La0.5Pr0.5(Fe0.88Si0.12)13H1.6 is still larger than the value of -23 J / kg K for La(Fe0.88Si0.12)13H1.5 having almost the same value of TC. Consequently, ,Sm MAX of the La0.5Pr0.5(Fe0.88Si0.12)13Hy is larger than that of La(Fe0.88Si0.12)13Hy in a wide temperature range covering room temperature.

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MAGNETOCALORIC EFFECT IN THE INTERMETALLIC COMPOUND Gd3Ni8Al

Modern Physics Letters B ◽

10.1142/s0217984912501679 ◽

2012 ◽

Vol 26 (25) ◽

pp. 1250167 ◽

Cited By ~ 1

Author(s):

M. X. WANG ◽

H. FU ◽

Q. ZHENG ◽

J. TANG

Keyword(s):

Intermetallic Compound ◽

Magnetocaloric Effect ◽

Single Phase ◽

Magnetic Entropy Change ◽

Magnetic Measurements ◽

Entropy Change ◽

Magnetic Entropy ◽

X Ray Diffraction ◽

X Ray ◽

Refrigerant Capacity

The magnetic properties and magnetocaloric effect of the polycrystalline Gd 3 Ni 8 Al intermetallic compound are studied in this paper. Powder X-ray diffraction shows that the alloy is CeNi 3-type single-phase structure. The magnetic measurements indicate that the compound is ferromagnetic and undergoes a second-order phase transition at 62 K. The maximum of magnetic entropy change reaches 11 J/kg K for the field change from 0 to 50 kOe and the refrigerant capacity of the titled compound is found to be 4.8×102 J/kg.

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Large Room Temperature Magnetocaloric Effect in Ni50Mn34(Co,Cu)In15

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.316-317.996 ◽

2013 ◽

Vol 316-317 ◽

pp. 996-1001 ◽

Cited By ~ 1

Author(s):

Zhe Li ◽

Chao Jing ◽

Jun Jun Wu ◽

Ling Xian Wu ◽

Jian Yin ◽

...

Keyword(s):

Martensitic Transformation ◽

Exchange Interaction ◽

Magnetocaloric Effect ◽

Room Temperature ◽

Magnetic Entropy Change ◽

Parent Phase ◽

Entropy Change ◽

Magnetic Entropy ◽

Room Temperature Magnetic Refrigeration ◽

Ferromagnetic Ordering

Effect of Co or Cu slightly introduced in Ni50Mn35In15on martensitic transformation and magnetocaloric effect was investigated. The small doping of Co can modify exchange interaction between Mn atoms, resulting in the ferromagnetic ordering of the parent phase and a large magnetization difference across the martensitic transformation. For Cu-doped sample, a large was obtained, and gives rise to a large magnetic entropy change of 58.4 J/kg K for 5 T near room temperature accompanying with smaller hysteresis losses. The study on the doping system may have significant impact on realization of room-temperature magnetic refrigeration.

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Magnetocaloric Effect in RFe10X2( X=Mo, V)

International Journal of Computational Physics Series ◽

10.29167/a1i1p102-113 ◽

2018 ◽

Vol 1 (1) ◽

pp. 102-113

Author(s):

Raghda Abu El-Nasr ◽

Samy H. Aly ◽

Sherif Yehia ◽

Hala A. Sobh

Keyword(s):

Heat Capacity ◽

Magnetocaloric Effect ◽

Magnetic Entropy Change ◽

Mean Field ◽

Entropy Change ◽

Field Analysis ◽

Electronic Contribution ◽

Sublattice Model ◽

Magnetic Entropy ◽

Field Change

We present a mean-field study on the magnetocaloric effect (MCE) in RFe10X2, where X=Mo, V, and R=Gd, Tb, Ho, Tm, Dy, Er, Nd for X=V. For X=Mo, R=Dy, Gd, and Nd. The two-sublattice model, involving the 4f (rare earth) and 3d(Fe) sublattices, is used. For both systems, magnetization, magnetic heat capacity, magnetic entropy and isothermal entropy change ∆Sm are calculated for different magnetic fields in the 0-5T range and the temperature range from 0 to 700K. Direct and inverse MCEs are shown to take place in these ferromagnetic/ferrimagnetic compounds. For a field change ∆H=5T, the maximum isothermal magnetic entropy change has been calculated for ferromagnetic NdFe10Mo2 compound to be 6.6 J/K mol at Tc=441 K. Both direct, and inverse MCEs have been found in ferrimagnetic compounds, e.g., for TmFe10V2, with maximum -∆Sm= J/K mol at Tc=521K and ∆Sm= J/K mol at TN=127 K. Mean-field analysis is suitable for handling the systems we report on. Further study on the lattice and electronic contribution to entropy is planned.

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Room Temperature Magnetocaloric Effect of the Cox(MnSb)1-x Compounds

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.683.56 ◽

2013 ◽

Vol 683 ◽

pp. 56-59 ◽

Cited By ~ 1

Author(s):

Jian Hua Lin ◽

Shan Dong Li ◽

Li Li Wang ◽

Jie Qiu ◽

Zhi Yi Cai ◽

...

Keyword(s):

Magnetic Field ◽

Magnetocaloric Effect ◽

Room Temperature ◽

Magnetic Entropy Change ◽

Magnetic Hysteresis ◽

Entropy Change ◽

Magnetic Entropy ◽

Thermal Lag ◽

Magnetocaloric Materials ◽

Curie Temperature Tc

The room-temperature magnetocaloric effect (MCE) of Cox(MnSb)1-x (x=0.07, 0.15, 0.24) alloys has been investigated. It is revealed that the Curie temperature TC and the magnetic entropy change ΔSM are sensitive to the Co content x. When x=0.15, the MCE of Co0.15(MnSb)0.85 alloy is optimal with ΔSM=1.8 J/kg.K at 324 K under an applied magnetic field of 3 T. A second-order phase transformation occurs around TC, and the magnetic hysteresis loss thermal lag is negligible. These features demonstrate that Co0.15(MnSb)0.85 alloy is a promising room-temperature magnetocaloric materials.

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Large magnetic entropy change at cryogenic temperature in rare earth HoN nanoparticles

RSC Advances ◽

10.1039/c6ra16356d ◽

2016 ◽

Vol 6 (79) ◽

pp. 75562-75569 ◽

Cited By ~ 4

Author(s):

K. P. Shinde ◽

S. H. Jang ◽

M. Ranot ◽

B. B. Sinha ◽

J. W. Kim ◽

...

Keyword(s):

Rare Earth ◽

Low Temperature ◽

Magnetocaloric Effect ◽

Cryogenic Temperature ◽

Magnetic Entropy Change ◽

Entropy Change ◽

Environmental Problems ◽

Magnetic Refrigeration ◽

Magnetic Entropy ◽

Alternative Technology

The most extensive cooling techniques based on gases have faced environmental problems. The magnetic refrigeration is an alternative technology based on magnetocaloric effect. HoN nanoparticles are good refrigerant material at low temperature.

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

MRS Proceedings ◽

10.1557/proc-1200-g07-05 ◽

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.

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Modeling the Maximum Magnetic Entropy Change of Doped Manganite Using a Grid Search-Based Extreme Learning Machine and Hybrid Gravitational Search-Based Support Vector Regression

Crystals ◽

10.3390/cryst10040310 ◽

2020 ◽

Vol 10 (4) ◽

pp. 310 ◽

Cited By ~ 2

Author(s):

Sami M. Ibn Shamsah ◽

Taoreed O. Owolabi

Keyword(s):

Magnetocaloric Effect ◽

Magnetic Entropy Change ◽

Entropy Change ◽

Support Vector ◽

Grid Search ◽

Magnetic Entropy ◽

Ionic Model ◽

Crystal Model ◽

Learning Machine ◽

Better Than

The thermal response of a magnetic solid to an applied magnetic field constitutes magnetocaloric effect. The maximum magnetic entropy change (MMEC) is one of the quantitative parameters characterizing this effect, while the magnetic solids exhibiting magnetocaloric effect have great potential in magnetic refrigeration technology as they offer a green solution to the known pollutant-based refrigerants. In order to determine the MMEC of doped manganite and the influence of dopants on the magnetocaloric effect of doped manganite compounds, this work developed a grid search (GS)-based extreme learning machine (ELM) and hybrid gravitational search algorithm (GSA)-based support vector regression (SVR) for estimating the MMEC of doped manganite compounds using ionic radii and crystal lattice parameters as descriptors. Based on the root-mean-square error (RMSE), the developed GSA-SVR-radii model performs better than the existing genetic algorithm (GA)-SVR-ionic model in the literature by 27.09%, while the developed GSA-SVR-crystal model performs better than the existing GA-SVR-lattice model in the literature by 38.34%. Similarly, the developed ELM-GS-crystal model performs better than the existing GA-SVR-ionic model with a performance enhancement of 14.39% and 20.65% using the mean absolute error (MAE) and RMSE, respectively, as performance measuring parameters. The developed models also perform better than the existing models using correlation coefficient as the performance measuring parameter when validated with experimentally measured MMEC. The superior performance of the present models coupled with easy accessibility of the descriptors definitely will facilitate the synthesis of doped manganite compounds with a high magnetocaloric effect without experimental stress.

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