Enhanced magnetocaloric properties in annealed Heusler Ni–Mn–Sn ribbons

Wu, Wei; Li, Hongwei; Ren, Jian; Fu, Jianxun; Zhai, Qijie; Luo, Zhiping; Zheng, Hongxing

doi:10.1016/j.jmmm.2014.08.042

Cited by 13 publications

(7 citation statements)

References 19 publications

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“…As it was previously shown in several studies 15 , 16 , 18 – 20 , annealing can improve the magnetocaloric properties of Heusler alloys. Compared to bulk Heusler alloys, reduced annealing times of around some minutes to hours are typical for melt-spun geometries 6 , owing to their large surface to volume ratio.…”

Section: Resultssupporting

confidence: 63%

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Role of disorder when upscaling magnetocaloric Ni-Co-Mn-Al Heusler alloys from thin films to ribbons

Weise

Dutta

Teichert

et al. 2018

Sci Rep

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Research in functional magnetic materials often employs thin films as model systems for finding new chemical compositions with promising properties. However, the scale-up of thin films towards bulk-like structures is challenging, since the material synthesis conditions are entirely different for thin films and e.g. rapid quenching methods. As one of the consequences, the type and degree of order in thin films and melt-spun ribbons are usually different, leading to different magnetic properties. In this work, using the example of magnetocaloric Ni-Co-Mn-Al melt-spun ribbons and thin films, we show that the excellent functional properties of the films can be reproduced also in ribbons, if an appropriate heat treatment is applied, that installs the right degree of order in the ribbons. We show that some chemical disorder is needed to get a pronounced and sharp martensitic transition. Increasing the order with annealing improves the magnetic properties only up to a point where selected types of disorder survive, which in turn compromise the magnetic properties. These findings allow us to understand the impact of the type and degree of disorder on the functional properties, paving the way for a faster transfer of combinatorial thin film research towards bulk-like materials for magnetic Heusler alloys.

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Section: Resultssupporting

confidence: 63%

“…For instance, the effect of annealing temperature on the martensitic transformation and the magnetic properties has been studied intensively in Ni-Mn-Ga 10 , 11 and Ni-Co-Mn-Ga 12 , 13 alloys. Recent experiments even suggest the possibility of improving the magnetocaloric effect with optimal annealing 15 , 16 .…”

Section: Introductionmentioning

confidence: 99%

Role of disorder when upscaling magnetocaloric Ni-Co-Mn-Al Heusler alloys from thin films to ribbons

Weise

Dutta

Teichert

et al. 2018

Sci Rep

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“…Melt-spinning as a rapid solidification technique is gaining wide acceptance in synthesizing Heusler alloys [94,95,96] for varying reasons, such as obtaining textured samples suitable for practical utilization as sensors, actuators and magnetocaloric materials which optimize the heat transfer in a refrigeration unit [97,98,99]. Furthermore, it lends credence to the fact that the processing methods can tailor the functional attributes of Heusler alloys by controlling the lattice parameters, interatomic distance, degree of atomic ordering and microstructure.…”

Section: Methods Of Synthesis and Characterizationmentioning

confidence: 99%

“…Heat-treated ribbons exhibited ~1.7 times larger GS/ t (grain size to thickness ratio) than solutionized bulk sample and were more suited for magnetocaloric applications [96]. Wheel speed and annealing temperature have been reported to be controlling factors for grain size, interatomic distance, smaller thermal hysteresis and degree of atomic ordering in order to achieve remarkable magnetic properties, such as high values of magnetic entropy change (ΔS M ) and refrigeration capacity (RC) [94,177]. There are, however, conflicting claims that in alloys in which L2 1 –B2 ordering transition is absent, thermal treatments are in vain with regards to the tuning of the magnetostructural properties [178], while high-temperature annealing has been reported to favor the tuning of the degree of atomic order in Ni 49 Mn 39 Sn 12 alloy ribbons with L2 1 –B2 ordering [94].…”

Section: Microstructural Effects On Propertiesmentioning

confidence: 99%

Ferromagnetic Shape Memory Heusler Materials: Synthesis, Microstructure Characterization and Magnetostructural Properties

et al. 2018

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An overview of the processing, characterization and magnetostructural properties of ferromagnetic NiMnX (X = group IIIA–VA elements) Heusler alloys is presented. This type of alloy is multiferroic—exhibits more than one ferroic property—and is hence multifunctional. Examples of how different synthesis procedures influence the magnetostructural characteristics of these alloys are shown. Significant microstructural factors, such as the crystal structure, atomic ordering, volume of unit cell, grain size and others, which have a bearing on the properties, have been reviewed. An overriding factor is the composition which, through its tuning, affects the martensitic and magnetic transitions, the transformation temperatures, microstructures and, consequently, the magnetostructural effects.

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“…Привлекаются и другие технологические приемы для улучшения свойств сплавов, в частности, отжиг при высоких температурах, который снимает механические напряжения, особенно присущие быстрозакаленным образцам и способствует магнитному и структурному упорядочению и существенно улучшает их магнитотранспортные характеристики [9,[16][17][18][19]. Так, согласно [9,17] отжиг пленок Ni 50 Mn 37 Sn 13 при высоких температурах приводит к многократному росту изменения энтропии S m и к сдвигу максимума магнитокалорического эффекта в сторону высоких температур.…”

Section: Introductionunclassified

Тепловые, магнитные и магнитотранспортные свойства быстрозакаленнго ленточного образца Ni-=SUB=-50-=/SUB=-Mn-=SUB=-35-=/SUB=-Al-=SUB=-2-=/SUB=-Sn-=SUB=-13-=/SUB=-

Хизриев¹,

Gamzatov²,

Batdalov³

et al. 2020

Физика Твердого Тела

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The heat capacity, thermal diffusivity, thermal conductivity, magnetization, and electrical resistance in a tape sample of Ni50Mn35Al2Sn13 alloy were studied. The temperature dependence of thermal diffusion shows pronounced anomalies in the form of minima associated with magnetic and magnetostructural transformations. The behavior of thermal conductivity and thermal diffusion indicates that the mean free path of heat carriers is limited by the structural imperfections of the tape. The transition of the sample to the martensitic phase is accompanied by a sharp increase in the electrical resistance, suggesting an increase in the electron relaxation rate due to structural distortions inherent in martensite. The magnitude of the magnetoresistive effect ∆ρ/ρ_0 in the field of 1.8T near the martensitic transition is reached 40%. The temperature hysteresis was revealed in the dependence ρ(T) near TC, which indicates the structural heterogeneity of the austenitic phase.

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Enhanced magnetocaloric properties in annealed Heusler Ni–Mn–Sn ribbons

Cited by 13 publications

References 19 publications

Role of disorder when upscaling magnetocaloric Ni-Co-Mn-Al Heusler alloys from thin films to ribbons

Role of disorder when upscaling magnetocaloric Ni-Co-Mn-Al Heusler alloys from thin films to ribbons

Ferromagnetic Shape Memory Heusler Materials: Synthesis, Microstructure Characterization and Magnetostructural Properties

Тепловые, магнитные и магнитотранспортные свойства быстрозакаленнго ленточного образца Ni-=SUB=-50-=/SUB=-Mn-=SUB=-35-=/SUB=-Al-=SUB=-2-=/SUB=-Sn-=SUB=-13-=/SUB=-

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