First Principles Study of the Structural and Magnetic Properties of Cr-Doped Ni&lt;sub&gt;1.75&lt;/sub&gt;Co&lt;sub&gt;0.25&lt;/sub&gt;Mn&lt;sub&gt;1.5&lt;/sub&gt;In&lt;sub&gt;0.5&lt;/sub&gt; Heusler Alloys

Pavlukhina, Oksana; Buchelnikov, V. D.

doi:10.4028/www.scientific.net/msf.845.138

Cited by 7 publications

(6 citation statements)

References 8 publications

(10 reference statements)

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“…Figure shows the magnetocaloric effect of the alloy Ni 45 Co 5 Mn 32 Cr 5 In 13 with an adiabatic temperature change of nearly 10 K . This is a record value for Heusler alloys and is close to the Δ T ad =12.9 K value of Fe–Rh and 9.2 K for Fe 49 Rh 51 upon the first application of a magnetic field of Δ μ 0 H =1.9 T, which remains as high as 6.2 K during cycling in an alternated field of the same magnitude .…”

Section: Magnetostructural Phase Transition Of Rapidly Quenched Heuslsupporting

confidence: 59%

“…2018 Wiley-VCH Verlag GmbH &Co. KGaA,W einheim Figure 11 shows the magnetocaloric effect of the alloy Ni 45 Co 5 Mn 32 Cr 5 In 13 with an adiabatic temperature change of nearly 10 K. [17,59] This is ar ecord value for Heusler alloys and is close to the DT ad = 12.9 Kv alue of Fe-Rh [60,61] and 9.2 K for Fe 49 Rh 51 upont he first application of am agnetic field of Dm 0 H = 1.9 T, which remainsa sh igh as 6.2 Kd uring cycling in an alternated field of the same magnitude. [62] It has been shown that am agnetic state changeo fR hb etween antiferromagnetism (with aR hm omento f0m B )a nd ferromagnetism ( % 0.9 m B ), accompanied by as ignificant change in electronic structure,c ombinea st he main origin of the metamagnetic transition.…”

Section: Magnetostructural Phase Transition Of Rapidly Quenched Heuslmentioning

confidence: 99%

“…(b) Formation( mixing) energyof Ni 7 CoMn 6Àx Cr x In 2 calculated as the differencebetween the total energy of the 16-atomL 2 1 supercell with ferromagnetic order and all partial total energies of the pure elements (with stability up to x = 0.5,corresponding to 12.5 at %C r). [59] Reproducedf romRef. [7] (Copyright Wiley-VCH, 2018).…”

Section: Noncollinear Magnetismmentioning

confidence: 99%

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Properties and Decomposition of Heusler Alloys

et al. 2018

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Martensitic transformations of rapidly quenched and less‐rapidly cooled Heusler alloys of type Ni–Mn–X with X=Ga, In, and Sn are investigated by ab initio calculations. For alloys rapidly cooled from 1173 K, we obtain the well‐known magnetocaloric properties near the magnetocaloric phase transition. For the less‐rapidly cooled alloys with secondary heat treatment these magnetocaloric properties start to change considerably, because each alloy transforms during temper‐annealing into a dual‐phase composite alloy. These two phases are identified to be cubic stoichiometric Ni2MnX and tetragonal disordered NiMn.

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Section: Magnetostructural Phase Transition Of Rapidly Quenched Heuslsupporting

confidence: 59%

Section: Magnetostructural Phase Transition Of Rapidly Quenched Heuslmentioning

confidence: 99%

Section: Noncollinear Magnetismmentioning

confidence: 99%

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Properties and Decomposition of Heusler Alloys

et al. 2018

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“…The model parameters for Ni 45 Co 5 Mn 37 In 13 microwires and coolant (water) were taken by analogy with Refs. [3,10,11]. Note that we consider the composition, which is similar to Ni 45.2 Mn 36.7 In 13 Co 5.1 [3].…”

Section: Resultsmentioning

confidence: 99%

Theoretical study of heat transfer processes in Heusler-type magnetic microwires

2019

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In the present work, two types of geometrical arrangement (C-1 and C-2) of Heusler-type Ni 45 Co 5 Mn 37 In 13 microwires in a cooling cell are investigated theoretically. The influence of the location of microwires on the course of heat transfer processes was investigated. The diameter of microwires was ranged from 10 to 50 μm, while the length of microwires was fixed to 1 mm. The calculations were carried out for two cells with differently arranged layers of microwires. The volume of the cooling cell and the cell parameters were similar for both cells. To simulate the heat transfer process in a three-dimensional cooling cell with microwires, we considered a mathematical model including the heat conduction and convection mechanisms, as well as the coolant motion. To model heat transfer processes, the system of Navier-Stokes, continuity and thermal conductivity equations is solved by the finite-element method. It is shown that the relaxation time is about 2.4 ms and 2.2 ms for cooling cells C-1 and C-2, which contain microwires with a diameter of 50 μm, and about 0.9 ms and 0.8 ms for cooling cells C-1 and C-2, which contain microwires with a diameter of 10 μm. A lower relaxation time indicates that heat transfer can occur faster in the C-2 cell with the same initial coolant velocity and equal wire thickness. It is also established that the transfer of thermal energy occurs more efficiently and faster in the cell C-2. Our study reveals that the geometrical arrangement of C-2 cell is more optimal.

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“…Other remarkable features like the magnetic shape‐memory and magnetocaloric effects have recently been highlighted by Planes et al The isothermal entropy and and adiabatic temperature changes associated with the magnetostructural transition can be evaluated by Monte Carlo simulations using

Δ S_{m a g} true(T, H true) = μ_{0} \int_{0}^{H} d H^{'} {(\frac{\partial M}{\partial T})}_{H^{'}},

Δ T_{a d} true(T, H true) = - T \frac{Δ S_{m a g} true(T, H true)}{C true(T, H true)} .

Figure shows the magnetocaloric effect of the alloy Ni 45 Co 5 Mn 32 Cr 5 In 13 with an adiabatic temperature change of nearly 10 K . This is a record value for Heusler alloys and is close to

Δ T_{a d} = 12.9

K of Fe–Rh and 9.2 K for Fe 49 Rh 51 on the first application of a magnetic field of

Δ μ_{0} H = 1.9

T which remains as high as 6.2 K during the cycling in alternated field of the same magnitude .…”

Section: Magnetostructural Phase Transition Of Rapidly Quenched Heuslmentioning

confidence: 95%

Probing Structural and Magnetic Instabilities and Hysteresis in Heuslers by Density Functional Theory Calculations

Entel

Gruner

Fähler

et al. 2017

Physica Status Solidi (b)

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Martensitic transformations of rapidly quenched and less rapidly cooled Heusler alloys of type Ni-Mn-X with X ¼ Ga, In, and Sn are investigated by ab initio calculatioms. For the rapidly cooled alloys, we obtain the magnetocaloric properties near the magnetocaloric transition. For the less rapidly quenched alloys these magnetocaloric properties start to change considerably, each alloy transforms during temper-annealing into a dual-phase composite alloy. The two phases are identified to be cubic Ni-Mn-X and tetragonal NiMn.

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First Principles Study of the Structural and Magnetic Properties of Cr-Doped Ni<sub>1.75</sub>Co<sub>0.25</sub>Mn<sub>1.5</sub>In<sub>0.5</sub> Heusler Alloys

Cited by 7 publications

References 8 publications

Properties and Decomposition of Heusler Alloys

Properties and Decomposition of Heusler Alloys

Theoretical study of heat transfer processes in Heusler-type magnetic microwires

Probing Structural and Magnetic Instabilities and Hysteresis in Heuslers by Density Functional Theory Calculations

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