Magnetocaloric effect in Gd5(Si,Ge)4 based alloys and composites

Synoradzki, K.; Nowotny, P.; Skokowski, P.; Toliński, T.

doi:10.1016/j.jre.2019.02.008

Cited by 11 publications

(3 citation statements)

References 47 publications

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“…[1][2][3] It is known that the magnetocaloric material is the heart of the magnetic refrigeration technology. In the past few decades, many materials with large magnetocaloric effect (MCE) have been reported, like Gd 5 (Si x Ge 1Àx ) 4 , [4][5][6] LaFe 13Àx Si x and its hydrides, [7][8][9] Heusler alloys, [10][11][12] (Mn, Fe) 2 (P,X) (X ¼ As, Ge, Si) series alloys, [13][14][15] and so on. For these MCE materials with first-order magnetic transition (FOMT), the structure change often occurs across the magnetic phase transition, due to which the lattice entropy results in the giant entropy change.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn_0.975Fe_0.975P_0.5Si_0.5 Alloys by Optimizing Quenching Temperature

Zheng

Wang

et al. 2022

Adv Eng Mater

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The effect of quenching temperature on phase structure and magnetocaloric properties of the Mn0.975Fe0.975P0.5Si0.5 alloys are systematically studied by X‐ray diffraction, scanning electron microscope, differential scanning calorimetry, and vibrating sample magnetometer. The Mn0.975Fe0.975P0.5Si0.5 alloys quenched at 1323, 1073, 873, and 673 K are all crystallized in the hexagonal Fe2P‐type phase and the phase fraction of the Fe2P phase increases with the decreases of quenching temperature. As the quenching temperature decreases from 1323 to 673 K, the crystal lattice of alloys expands and the atoms' occupation is more ordered, while the saturation magnetic moment increases from 3.71 to 4.10 μB f.u.−1 The values of thermal hysteresis increase linearly from 30 to 41 K when the quenching temperature is down to 673 K. This enhancement of the first‐order magnetic transition (FOMT) yields the maximum value of magnetic entropy change at 5 T increasing by 36%. To obtain excellent comprehensive properties for (Mn,Fe)2(P,Si) alloys, the methods of doping B element in the Mn0.975Fe0.975P0.5Si0.5 alloy are employed to tune the magnetocaloric properties. The results provide insights and systematic understanding into the effect of quenching temperature on the magnetocaloric properties of (Mn,Fe)2(P,Si)‐based alloys.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn_0.975Fe_0.975P_0.5Si_0.5 Alloys by Optimizing Quenching Temperature

Zheng

Wang

et al. 2022

Adv Eng Mater

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“…The MCE can be described either by the isothermal change of magnetic entropy, ∆S m , or the adiabatic temperature change ∆T ad . In general, there are direct or indirect methods of measuring the MCE [35][36][37][38][39][40][41][42][43].…”

Section: Methods Of Measurement Of Mcementioning

confidence: 99%

Finite Element Analysis of Magnetic Field Exciter for Direct Testing of Magnetocaloric Materials’ Properties

Łyskawiński¹,

Szeląg²,

Jędryczka³

et al. 2021

Energies

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The paper presents research on magnetic field exciters dedicated to testing magnetocaloric materials (MCMs) as well as used in the design process of magnetic refrigeration systems. An important element of the proposed test stand is the system of magnetic field excitation. It should provide a homogeneous magnetic field with a controllable value of its intensity in the MCM testing region. Several concepts of a magnetic circuit when designing the field exciters have been proposed and evaluated. In the MCM testing region of the proposed exciters, the magnetic field is controlled by changing the structure of the magnetic circuit. A precise 3D field model of electromagnetic phenomena has been developed in the professional finite element method (FEM) package and used to design and analyze the exciters. The obtained results of the calculations of the magnetic field distribution in the working area were compared with the results of the measurements carried out on the exciter prototype. The conclusions resulting from the conducted research are presented and discussed.

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“…The search for such materials has been going on continuously for many years. Materials that exhibit a large magnetocaloric effect around room temperature include Gd [6,7], Gd 5 (Si,Ge) 4 [8,9], FeRh [10,11], La(Fe,Si,X) 13 H x [12], La(Fe,Si) 13 [13], Ni-Mn-In Heusler alloys [14,15], Mn-Fe-P-As alloys [16], and MnAs alloys [17].…”

Section: Introductionmentioning

confidence: 99%

Tuning of the Magnetocaloric Properties of Mn5Ge3 Compound by Chemical Modification

et al. 2022

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The rare earth-free Mn5Ge3 compound shows magnetocaloric properties similar to those of pure Gd; therefore, it is a good candidate for magnetic refrigeration technology. In this work, we investigate the influence of chemical substitution on the crystal structure and the magnetic, thermodynamic, and magnetocaloric properties of a polycrystalline Mn5Ge3 compound prepared by induction melting. For this purpose, we replaced 5% of the Mn with Cr or Co and 5% of the Ge with B or Al. The additional chemical elements were shown not to change the crystal structure of the parent compound (space group P63/mcm, No. 193). In the case of the magnetic properties, all samples remained ferromagnetic with the ordering temperature (TC) lower than for the original compound (TC = 295(1) K). The exception was the sample with B, where we observed an increase in TC by 3 K. The maximum value of the magnetic entropy change, |∆Sm|MAX (for a magnetic field change of 5 T), decreased from 7.1(1) for Mn5Ge3 to 6.2(1), 6.8(1), 4.8(1), and 5.8(1) J kg−1 K−1 for the alloys with B, Al, Cr, and Co, respectively. The adiabatic temperature change (∆Tad) (for a magnetic field change of 1 T) was determined from the specific heat measurements and was equal to 1.1(1), 1.2(1), 1.2(1), 0.8(1), and 0.8(1) K for Mn5Ge3, Mn5Ge2.85B0.15, Mn5Ge2.85Al0.15, Mn4.75Cr0.25Ge3, and Mn4.75Co0.25Ge3, respectively. The obtained data were compared with those from the literature. It was found that the substitution allowed for tuning of the ordering temperature in a wide temperature range. At the same time, the reduction in the magnetocaloric parameters’ values was relatively small. Therefore, the produced Mn5Ge3-based alloys allow for the expansion of the operation temperature range of the parent compound as a magnetocaloric material.

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Magnetocaloric effect in Gd5(Si,Ge)4 based alloys and composites

Cited by 11 publications

References 47 publications

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn_0.975Fe_0.975P_0.5Si_0.5 Alloys by Optimizing Quenching Temperature

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn_0.975Fe_0.975P_0.5Si_0.5 Alloys by Optimizing Quenching Temperature

Finite Element Analysis of Magnetic Field Exciter for Direct Testing of Magnetocaloric Materials’ Properties

Tuning of the Magnetocaloric Properties of Mn5Ge3 Compound by Chemical Modification

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Magnetocaloric effect in Gd5(Si,Ge)4 based alloys and composites

Cited by 11 publications

References 47 publications

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn0.975Fe0.975P0.5Si0.5 Alloys by Optimizing Quenching Temperature

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn0.975Fe0.975P0.5Si0.5 Alloys by Optimizing Quenching Temperature

Finite Element Analysis of Magnetic Field Exciter for Direct Testing of Magnetocaloric Materials’ Properties

Tuning of the Magnetocaloric Properties of Mn5Ge3 Compound by Chemical Modification

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Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn_0.975Fe_0.975P_0.5Si_0.5 Alloys by Optimizing Quenching Temperature

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn_0.975Fe_0.975P_0.5Si_0.5 Alloys by Optimizing Quenching Temperature