Comparison of magnetocaloric properties of the Mn 2−x Fe x P 0.5 As 0.5 ( x  = 1.0 and 0.7) compounds

Szymczak, R.; Nedelko, N.; Lewińska, S.; Zubov, E.; Sivachenko, A.P.; Gribanov, I. F.; Radelytskyi, I.; Dyakonov, K.; Ślawska‐Waniewska, A.; Val’kov, V. I.; Varyukhin, V. N.; Dyakonov, V.; Szymczak, H.

doi:10.1016/j.solidstatesciences.2014.06.015

Cited by 18 publications

(4 citation statements)

References 26 publications

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“…In order to avoid overestimating ÁS m in the case of the coexistence of a small amount of austenite and the major martensite phase in the initial state, the Clausius-Clapeyron relation was used for the correct determination of ÁS m . In the Clausius-Clapeyron relation, ÁS m is directly related to the magnetization difference induced by the magnetic field at a given temperature (Balli et al, 2009;Qu et al, 2017b;Szymczak et al, 2014):…”

Section: Magnetic Field-induced Magnetostructural Transition and Magnmentioning

confidence: 99%

Magnetic field-induced magnetostructural transition and huge tensile superelasticity in an oligocrystalline Ni–Cu–Co–Mn–In microwire

Chen

Cong

Sun

et al. 2019

Int Union Crystallogr J

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Meta-magnetic shape-memory alloys combine ferroelastic order with ferromagnetic order and exhibit attractive multifunctional properties, but they are extremely brittle, showing hardly any tensile deformability, which impedes their practical application. Here, for the first time, an Ni–Cu–Co–Mn–In microwire has been developed that simultaneously exhibits a magnetic field-induced first-order meta-magnetic phase transition and huge tensile superelasticity. A temperature-dependent in situ synchrotron high-energy X-ray diffraction investigation reveals that the martensite of this Ni43.7Cu1.5Co5.1Mn36.7In13 microwire shows a monoclinic six-layered modulated structure and the austenite shows a cubic structure. This microwire exhibits an oligocrystalline structure with bamboo grains, which remarkably reduces the strain incompatibility during deformation and martensitic transformation. As a result, huge tensile superelasticity with a recoverable strain of 13% is achieved in the microwire. This huge tensile superelasticity is in agreement with our theoretical calculations based on the crystal structure and lattice correspondence of austenite and martensite and the crystallographic orientation of the grains. Owing to the large magnetization difference between austenite and martensite, a pronounced magnetic field-induced magnetostructural transition is achieved in the microwire, which could give rise to a variety of magnetically driven functional properties. For example, a large magnetocaloric effect with an isothermal entropy change of 12.7 J kg−1 K−1 (under 5 T) is obtained. The realization of magnetic-field- and tensile-stress-induced structural transformations in the microwire may pave the way for exploiting the multifunctional properties under the coupling of magnetic field and stress for applications in miniature multifunctional devices.

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Section: Magnetic Field-induced Magnetostructural Transition and Magnmentioning

confidence: 99%

Magnetic field-induced magnetostructural transition and huge tensile superelasticity in an oligocrystalline Ni–Cu–Co–Mn–In microwire

Chen

Cong

Sun

et al. 2019

Int Union Crystallogr J

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“…The one-sided peak and phase separation can explain standard two-peak structure in metallic magnets, which experience first-order phase transition 3, 53,54 . It also points out the artifacts of the use of models, which do not account for such dependencies in experimental works 4,6,54 .…”

Section: Discussionmentioning

confidence: 95%

Emerging mechanisms of magnetocaloric effect in phase-separated metals

Ivchenko,

Igoshev

2021

Preprint

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We present a study of the magnetocaloric effect in metallic systems exhibiting first order magnetic transitions and focus on consequences of magnetic phase separation. We account for ferrimagnetic, ferromagnetic and Neel antiferromagnetic order. Based on the archetypal Hubbard model being treated within the mean-field approximation, we provide and explore its implications on the fieldinduced entropy change in metallic system with phase separation. Chosen framework allows us to properly analyze phase volumes' dependence on parameters of phase-separated (PS) system.Moreover, an account for phase separation boundaries as functions of magnetic field provides a natural splitting of the PS region, where each subregion corresponds to a different temperature dependence of entropy change: moving from one subregion to the other produces a kink, followed by a strong linear growth of entropy change. We encounter a second order magnetic transition from paramagnetic to antiferromagnetic phase in PS region that occurs for particular parameter values. Despite the fact that both phases have zero total magnetization, the transition has a strong impact on entropy change.

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“…Therefore, it is more suitable to use the Clausius-Clapeyron relation to estimate the reversible ΔSm. The ΔSm can be estimated by the following relation [34][35][36]:…”

Section: Magnetic-field-induced Phase Transformation and Magnetocalormentioning

confidence: 99%

External-Field-Induced Phase Transformation and Associated Properties in a Ni50Mn34Fe3In13 Metamagnetic Shape Memory Wire

Chen

Cong

et al. 2021

Metals

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Metamagnetic shape memory alloys exhibit a series of intriguing multifunctional properties and have great potential for applications in magnetic actuation, sensing and magnetic refrigeration. However, the poor mechanical properties of these alloys with hardly any tensile deformability seriously limit their practical application. In the present work, we developed a Ni-Fe-Mn-In microwire that exhibits both a giant, tensile superelasticity and a magnetic-field-induced first-order phase transformation. The recoverable strain of superelasticity is more than 20% in the temperature range of 233–283 K, which is the highest recoverable strain reported heretofore in Ni-Mn-based shape memory alloys (SMAs). Moreover, the present microwire exhibits a large shape memory effect with a recoverable strain of up to 13.9% under the constant tensile stress of 225 MPa. As a result of the magnetic-field-induced first-order phase transformation, a large reversible magnetocaloric effect with an isothermal entropy change ΔSm of 15.1 J kg−1 K−1 for a field change from 0.2 T to 5 T was achieved in this microwire. The realization of both magnetic-field and tensile-stress-induced transformations confers on this microwire great potential for application in miniature multi-functional devices and provides an opportunity for multi-functional property optimization under coupled multiple fields.

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Comparison of magnetocaloric properties of the Mn 2−x Fe x P 0.5 As 0.5 ( x = 1.0 and 0.7) compounds

Cited by 18 publications

References 26 publications

Magnetic field-induced magnetostructural transition and huge tensile superelasticity in an oligocrystalline Ni–Cu–Co–Mn–In microwire

Magnetic field-induced magnetostructural transition and huge tensile superelasticity in an oligocrystalline Ni–Cu–Co–Mn–In microwire

Emerging mechanisms of magnetocaloric effect in phase-separated metals

External-Field-Induced Phase Transformation and Associated Properties in a Ni50Mn34Fe3In13 Metamagnetic Shape Memory Wire

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