Tailoring barocaloric and magnetocaloric properties in low-hysteresis magnetic shape memory alloys

Stern‐Taulats, Enric; Planes, Antoni; Lloveras, Pol; Barrio, Marı́a; Tamarit, J. Ll.; Pramanick, S.; Majumdar, S.; Yüce, Süheyla; Emre, B.; Frontera, C.; Mañosa, Lluı́s

doi:10.1016/j.actamat.2015.06.026

Cited by 105 publications

(74 citation statements)

References 41 publications

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“…This finding is explained by the special characteristics of the minor loops and demonstrates that the actual cyclic effect cannot be predicted by isofield experiments only. As the calorimetric measurements represent a quasi‐static method, the actual properties from fast field cycling experiments are not reproduced accordingly, although this is in principle possible for calorimetric measurements with limited field‐sweep rates . The evaluation of minor loops starting at temperatures where a mixed state of martensite and austenite is present in the sample shows that the thermal hysteresis is reduced significantly.…”

Section: Effect Of Hysteresis On the Mce Around Magnetostructural Tramentioning

confidence: 99%

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: Effect Of Hysteresis On the Mce Around Magnetostructural Tramentioning

confidence: 99%

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

et al. 2018

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“…In Table 3, we enclose some of the most representative BC compounds along with some basic refrigerant characteristics. To date, giant BC effects have been measured in a number of organic-inorganic hybrid perovskites [99,100], shape-memory alloys [115][116][117], polar compounds [118,119], the archetypal fast-ion conductor AgI [120], fluoride-based materials [121], polymers [122], and molecular crystals [123][124][125][126]. The phase transitions leading to the giant BC effects reported in Table 3 present some similarities to those explained in preceding sections, made the exception of molecular crystals.…”

Section: Overview Of Barocaloric Performancesmentioning

confidence: 99%

Novel mechanocaloric materials for solid-state cooling applications

Cazorla

2019

Applied Physics Reviews

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Current refrigeration technologies based on compression cycles of greenhouse gases are environmentally threatening and cannot be scaled down to on-chip dimensions. Solid-state cooling is an environmentally friendly and highly scalable technology that may solve most of the problems associated with current refrigerant methods. Solid-state cooling consists of applying external fields (magnetic, electric, and mechanical) on caloric materials, which react thermally as a result of induced phase transformations. From an energy efficiency point of view, mechanocaloric compounds, in which the phase transitions of interest are driven by mechanical stresses, probably represent the most encouraging type of caloric materials. Conventional mechanocaloric materials like shape-memory alloys already display good cooling performances however in most cases they also present critical mechanical fatigue and hysteresis problems that limit their applicability. Finding new mechanocaloric materials and mechanisms able to overcome those problems while simultaneously rendering large temperature shifts, is necessary to further advance the field of solid-state cooling. In this article, we review novel families of mechanocaloric materials that in recent years have been shown to be specially promising in the aspects that conventional mechanocaloric materials are not, and which exhibit unconventional but significant caloric effects. We put an emphasis on elastocaloric materials, in which the targeted cooling spans are obtained through uniaxial stresses, since from an applied perspective these appear to be the most accomplished. Two different types of mechanocaloric materials emerge as particularly hopeful from our analysis, (1) compounds that exhibit field-induced order-disorder phase transitions involving either ions or molecules (polymers, fast-ion conductors, and plastic crystals), and (2) multiferroics in which the structural parameters are strongly coupled with polar and/or magnetic degrees of freedom (magnetic alloys and oxide perovskites).Keywords: solid-state cooling, caloric materials, field-induced transformations, entropy potential positive impact in world's sustainability caused by even modest improvements in energy efficiency is enormous. Meanwhile, for microchips to perform optimally the heat generated by electric currents needs to be removed; efficient micro-sized coolers operating near room temperature, therefore, are pressingly needed for successful engineering of faster and more compact electronic devices.Solid-state cooling is an environmentally friendly, highly energy-efficient, and highly scalable technology that may solve most of the problems associated with current refrigerant methods. Solid-state cooling relies on caloric materials and the application of external fields. In caloric materials reversible temperature shifts are achieved through the application/removal of electric, magnetic, or mechanical fields that render electrocaloric, magnetocaloric, or mechanocaloric effects, respectively. These caloric effects are ori...

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“…The martensitic transition for this alloy is weakly first order (also termed second order like), with a low entropy change (∆S t ∼ 1.2 J/kg K) and a reduced hysteresis. Nevertheless, the second-order characteristics of the transition imply that ∂ǫ ∂T is not only given by the transition strain but it has also significant contributions beyond the transition region, and the resulting At present there are only a few reports on the barocaloric effect in magnetic shape memory alloys and until now data have been reported for Ni-Mn-In 9, 66 and Ni-Co-Mn-Ga 67 . A reason for this scarcity of data is the need for purpose-built experimental systems 68 which are not usually at hand in many laboratories.…”

Section: The Measurement Of Mechanocaloric Effectsmentioning

confidence: 99%

Mechanocaloric effects in shape memory alloys

Mañosa¹,

Planes²

2016

Phil. Trans. R. Soc. A.

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Shape memory alloys (SMA) are a class of ferroic materials which undergo a structural (martensitic) transition where the associated ferroic property is a lattice distortion (strain). The sensitiveness of the transition to the conjugated external field (stress), together with the latent heat of the transition, gives rise to giant mechanocaloric effects. In non-magnetic SMA, the lattice distortion is mostly described by a pure shear and the martensitic transition in this family of alloys is strongly affected by uniaxial stress, whereas it is basically insensitive to hydrostatic pressure. As a result, non-magnetic alloys exhibit giant elastocaloric effects but negligible barocaloric effects. By contrast, in a number of magnetic SMA, the lattice distortion at the martensitic transition involves a volume change in addition to the shear strain. Those alloys are affected by both uniaxial stress and hydrostatic pressure and they exhibit giant elastocaloric and barocaloric effects. The paper aims at providing a critical survey of available experimental data on elastocaloric and barocaloric effects in magnetic and non-magnetic SMA.This article is part of the themed issue 'Taking the temperature of phase transitions in cool materials'.

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Tailoring barocaloric and magnetocaloric properties in low-hysteresis magnetic shape memory alloys

Cited by 105 publications

References 41 publications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

Novel mechanocaloric materials for solid-state cooling applications

Mechanocaloric effects in shape memory alloys

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