Magnetic Properties and Magnetocaloric Effect in Selected MM’X-Type (M, M’ = 3d or 4d Metal, X = As, P, Ge) and Mn1-xTxAs-Type (T = 3d Metal) Intermetallics

In this report a review of magnetic properties of two groups of intermetallic compounds in relation with their magnetocaloric effect properties is presented. A first group of materials concerns the MM’X type (M, M’-metal 3d or 4d, X = As, P, Ge) of compounds. In this group the MnRh1-xCoxAs and MnFe1-xCoxP series of solid solutions are investigated. In a second group of materials, the Mn1-xTxAs (T = Cr, V, Ti, (Ti0.5V0.5) ) series of compounds are analyzed. In this case a special attention is paid for high dc field magnetization measurements and for selected compounds. As a summary the magnetic entropy change vs. M, M’ or T transition metal concentration for F-P phase transitions will be shown. Furthermore results of KKR-CPA electronic band structure computations in relation to magnetic properties are discussed.

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Ab initio study including spin–orbit coupling of the electronic band structure and magnetic properties of h-HoMnO3

Indian Journal of Physics ◽

10.1007/s12648-021-02129-7 ◽

2021 ◽

Author(s):

A. Chadli ◽

B. Lagoun ◽

L. Aissani ◽

Y. Berhail ◽

G. Manca ◽

...

Keyword(s):

Magnetic Properties ◽

Band Structure ◽

Ab Initio ◽

Electronic Band Structure ◽

Orbit Coupling ◽

Spin Orbit Coupling ◽

Spin Orbit ◽

Ab Initio Study ◽

Electronic Band

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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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Magnetic properties of the non-stoichiometric TbCo2Nix alloys

EPJ Web of Conferences ◽

10.1051/epjconf/201818504021 ◽

2018 ◽

Vol 185 ◽

pp. 04021

Author(s):

Alexander Inishev ◽

Evgeny Gerasimov ◽

Nikolay Mushnikov ◽

Pavel Terentev ◽

Vasily Gaviko

Keyword(s):

Magnetic Properties ◽

Curie Temperature ◽

Concentration Dependence ◽

Magnetic Moment ◽

Magnetic Entropy Change ◽

Entropy Change ◽

Magnetic Entropy ◽

Thermodynamic Relation ◽

Temperature Dependences

The magnetic and magnetothermal properties of the non-stoichiometric TbCo2Nix (0 ≤ x ≤ 0.2) alloys were studied. It was found that the concentration dependence of the Curie temperature and magnetic moment of the 3d-sublattice have a maximum at x = 0.025. The obtained experimental magnetic properties of the TbCo2Nix alloys were discussed under assumption that the Co magnetic moment in the compounds changes with increasing x. The magnetic entropy change was determined using the temperature dependences of the magnetization and Maxwell’s thermodynamic relation. The obtained results for TbCo2Nix were compared with those for the ErCo2Mnx alloys.

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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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First-principles studies of the elastic and magnetic properties of monolayer CrN

International Journal of Modern Physics B ◽

10.1142/s0217979221503021 ◽

2021 ◽

Author(s):

Tai Ma ◽

Jia Wang ◽

Xu Li ◽

Min Pu

Keyword(s):

Magnetic Properties ◽

Band Structure ◽

First Principles ◽

Electronic Band Structure ◽

Strain Analysis ◽

Exchange Interactions ◽

Potential Method ◽

Graphene Monolayer ◽

Electronic Band ◽

Spin Electronics

Two-dimensional (2D) materials with robust ferromagnetism properties have high potentials for application in the field of spintronics. However, extensively pursued 2D sheets, including pure graphene, monolayer BN, and layered transition metal dichalcogenides, are either nonmagnetic or weakly magnetic. The elastic, electronic and magnetic properties of monolayer CrN are calculated using the plane wave pseudo potential method based on first-principles density function theory. Upon determining through calculation that the structure of the monolayer CrN nanosheet is stable, its layer modulus [Formula: see text] shows that its strain resistance is stronger than that of graphene. Through strain analysis, materials with a monolayer CrN type of structure can be obtained. It is determined that 10% of the change in equilibrium area is still applicable to the 2D EOS, showing that this structure is quite stable. The spin-polarized electronic band structure is also calculated under different plane symmetry strains. The plane strain can be used to effectively adjust the metallic and magnetic properties of the material. Analyses of the band structure and density of states reveal that this material is half-metallic, where the origin of the ferromagnetism is related to [Formula: see text]–[Formula: see text] exchange interactions between the Cr and N atoms. Monolayer CrN has semimetallic properties and strong ferromagnetic (FM) properties. The FM effect can enhance the stability of the material. The results show that monolayer CrN is a semimetallic material with good elastic properties and a strong FM property. This material is therefore expected to have good application rospects in the field of spin electronics.

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Analyzing transport properties of p-type Mg2Si–Mg2Sn solid solutions: optimization of thermoelectric performance and insight into the electronic band structure

Journal of Materials Chemistry A ◽

10.1039/c8ta08920e ◽

2019 ◽

Vol 7 (3) ◽

pp. 1045-1054 ◽

Cited By ~ 26

Author(s):

Hasbuna Kamila ◽

Prashant Sahu ◽

Aryan Sankhla ◽

Mohammad Yasseri ◽

Hoang-Ngan Pham ◽

...

Keyword(s):

Band Structure ◽

Transport Properties ◽

Carrier Concentration ◽

Solid Solutions ◽

Figure Of Merit ◽

Electronic Band Structure ◽

Thermoelectric Performance ◽

Electronic Band ◽

P Type ◽

Insight Into

Figure of merit zT mapping of p-Mg2Si1−xSnx with respect to carrier concentration.

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Magnetic properties and magnetic entropy change in rare earth-rich aluminium compounds of RE 2 CuAl 3 ( RE = Dy and Tm)

Intermetallics ◽

10.1016/j.intermet.2018.03.006 ◽

2018 ◽

Vol 97 ◽

pp. 8-11

Author(s):

Lijuan Wang ◽

Chenping Bao ◽

Wenlin Gao ◽

Yanguo Pang ◽

Xiangjie Wang ◽

...

Keyword(s):

Magnetic Properties ◽

Rare Earth ◽

Magnetic Entropy Change ◽

Entropy Change ◽

Magnetic Entropy

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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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