Microstructural and magnetic properties of Mn-Fe-P-Si (Fe2 P-type) magnetocaloric compounds

Fries, Maximilian; Pfeuffer, Lukas; Bruder, Enrico; Gottschall, Tino; Ener, Semih; Diop, L.V.B.; Gröb, Thorsten; Skokov, Konstantin P.; Gutfleisch, Oliver

doi:10.1016/j.actamat.2017.04.040

Cited by 106 publications

(52 citation statements)

References 47 publications

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“…Due to this, magnetic disorder leads to an increased DOS at E F , which improves the electronic screening of atomic displacements and thus softens the lattice . The itinerant magnetism of Fe is also observed at the heart of the excellent caloric properties of MnFe(P,Si)‐type materials . In the following, we will discuss the impact of the specific microscopic degrees of freedom on the magnetocaloric properties for three classes of first‐order materials, La–Fe–Si, Ni–Mn‐based Heusler alloys, and FeRh.…”

Section: Disentangling the Microscopic Contributions To The Entropy Cmentioning

confidence: 99%

“…In panel (b) the adiabatic temperature change Δ T ad is shown measured on the cooling branch in a field change of 1.9 T. The inset shows the time‐dependent, cyclic MCE measured at a peak temperature of 268 K. Figure adapted from Ref. , used with permission. Original Figure ©Elsevier.…”

Section: Effect Of Hysteresis On the Mce Around Magnetostructural Tramentioning

confidence: 99%

“…The simulation results suggest that the virgin effect in Fe 2 P‐type materials is due to crack formation in the vicinity of large stresses evolving during the anisotropic expansion in a non‐textured material. Recently, the crack formation and propagation was observed by in situ optical microscopy . In Figure b, magnetization and direct measurements of Δ T ad in the first and in the second cycles are shown.…”

Section: Size‐dependence Of Magnetocaloric Particles On the Magnetocamentioning

confidence: 99%

“…[53][54][55] Thei tinerant magnetism of Fe is also observed at the heart of the excellent caloric properties of MnFe(P,Si)-type materials. [56][57][58][59] In the following, we will discuss the impacto ft he specific microscopic degrees of freedom on the magnetocaloric properties for three classes of first-order materials,L a-Fe-Si, Ni-Mn-based Heusler alloys,and FeRh.…”

Section: Disentangling the Microscopic Contributions To The Entropy Cmentioning

confidence: 99%

“…[5,[198][199][200] As ampleo fM n 1.32 Fe 0.71 P 0.5 Si 0.56 with ap hase purity of 95 wt %w as produced by ap owermetallurgical route as described in Ref. [59].…”

Section: Fe 2 Pc Ompoundsmentioning

confidence: 99%

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Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

et al. 2018

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Magnetic refrigeration relies on a substantial entropy change in a magnetocaloric material when a magnetic field is applied. Such entropy changes are present at first‐order magnetostructural transitions around a specific temperature at which the applied magnetic field induces a magnetostructural phase transition and causes a conventional or inverse magnetocaloric effect (MCE). First‐order magnetostructural transitions show large effects, but involve transitional hysteresis, which is a loss source that hinders the reversibility of the adiabatic temperature change ΔTad. However, reversibility is required for the efficient operation of the heat pump. Thus, it is the mastering of that hysteresis that is the key challenge to advance magnetocaloric materials. We review the origin of the large MCE and of the hysteresis in the most promising first‐order magnetocaloric materials such as Ni–Mn‐based Heusler alloys, FeRh, La(FeSi)13‐based compounds, Mn3GaC antiperovskites, and Fe2P compounds. We discuss the microscopic contributions of the entropy change, the magnetic interactions, the effect of hysteresis on the reversible MCE, and the size‐ and time‐dependence of the MCE at magnetostructural transitions.

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Section: Disentangling the Microscopic Contributions To The Entropy Cmentioning

confidence: 99%

Section: Effect Of Hysteresis On the Mce Around Magnetostructural Tramentioning

confidence: 99%

Section: Size‐dependence Of Magnetocaloric Particles On the Magnetocamentioning

confidence: 99%

Section: Disentangling the Microscopic Contributions To The Entropy Cmentioning

confidence: 99%

“…[5,[198][199][200] As ampleo fM n 1.32 Fe 0.71 P 0.5 Si 0.56 with ap hase purity of 95 wt %w as produced by ap owermetallurgical route as described in Ref. [59].…”

Section: Fe 2 Pc Ompoundsmentioning

confidence: 99%

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Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

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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

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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A Matter of Size and Stress: Understanding the First‐Order Transition in Materials for Solid‐State Refrigeration

Gottschall

Benke

Fries

et al. 2017

Adv Funct Materials

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Solid-state magnetic refrigeration is a high-potential, resource-efficient cooling technology. However, many challenges involving materials science and engineering need to be overcome to achieve an industry-ready technology. Caloric materials with a first-order transition-associated with a large volume expansion or contraction-appear to be the most promising because of their large adiabatic temperature and isothermal entropy changes. In this study, using experiment and simulation, it is demonstrated with the most promising magnetocaloric candidate materials, La-Fe-Si, Mn-Fe-P-Si, and Ni-Mn-In-Co, that the characteristics of the first-order transition are fundamentally determined by the evolution of mechanical stresses. This phenomenon is referred to as the stress-coupling mechanism. Furthermore, its applicability goes beyond magnetocaloric materials, since it describes the first-order transitions in multicaloric materials as well.under the application of an external field (i.e., electric, magnetic, mechanical stress, or pressure), as illustrated in Figure 1.Recently, the idea of utilizing not just one of these external fields, but a combination of multiple stimuli to transform the caloric material, was proposed, the so-called multicaloric effect. [15][16][17][18][19] In this study, we demonstrate that the caloric effect in materials with a first-order transition is always a consequence of multiple stimuli. Using the example of the three most promising magnetocaloric materials, La-Fe-Si, [20][21][22] Fe 2 P-type, [23][24][25][26] and Heusler alloys, [27][28][29] we develop a model from which the crucial role of mechanical stress is clear. This stress-coupling model does not involve any magnetism and is therefore immediately applicable to all the other caloric effects presented in Figure 1, helping us to understand first-order transitions in general. Cooling Technology

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Microstructural and magnetic properties of Mn-Fe-P-Si (Fe2 P-type) magnetocaloric compounds

Cited by 106 publications

References 47 publications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

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

A Matter of Size and Stress: Understanding the First‐Order Transition in Materials for Solid‐State Refrigeration

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Microstructural and magnetic properties of Mn-Fe-P-Si (Fe2 P-type) magnetocaloric compounds

Cited by 106 publications

References 47 publications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

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

A Matter of Size and Stress: Understanding the First‐Order Transition in Materials for Solid‐State Refrigeration

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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