Electronic aspects of the martensitic transition in Ni–Mn based Heusler alloys

Krenke, Thorsten; Moya, Xavier; Aksoy, Seda; Acet, Mehmet; Entel, P.; Mañosa, Lluı́s; Planes, Antoni; Elerman, Y.; Yücel, A.; Wassermann, E. F.

doi:10.1016/j.jmmm.2006.10.1139

Cited by 132 publications

(62 citation statements)

References 7 publications

(9 reference statements)

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“…Hence, a simple choice of e/a can only be considered to be a guideline for examining systematic changes within a single-alloy system. Actually, the lack of universal character of e/a parameterization has been previously pointed out for the Heusler alloys Ni-Mn-X [33,43] and has been recently confirmed by the manipulation of structural and magnetic transition temperatures in isoelectronic Ni-Mn-Ga and Ni-Mn-Ga-In compounds [38,44].…”

Section: Discussionmentioning

confidence: 75%

Phase diagram of Fe-doped Ni-Mn-Ga ferromagnetic shape-memory alloys

et al. 2008

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We have studied the effect of Fe addition on the structural and magnetic transitions in the magnetic shape memory alloy Ni-Mn-Ga by substituting systematically each atomic species by Fe. Calorimetric and AC susceptibility measurements have been carried out in order to study the magnetic and structural transformation properties. We find that the addition of Fe modifies the structural and magnetic transformation temperatures. Magnetic transition temperatures are displaced to higher values when Fe is substituted into Ni-Mn-Ga, while martensitic and premartensitic transformation temperatures shift to lower values. Moreover, it has been found that the electron per atom concentration essentially governs the phase stability in the quaternary system. However, the observed scaling of transition temperatures with e/a differs from that reported in the related ternary system Ni-Mn-Ga.

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Section: Discussionmentioning

confidence: 75%

Phase diagram of Fe-doped Ni-Mn-Ga ferromagnetic shape-memory alloys

et al. 2008

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“…In this sense, it is known that the ground state of Ni-Mn-Z alloys (Z as Ga, In, Al, ...) shows the same sequence of phases when e/a is increased [50]. However, for a given value of e/a the corresponding M s transition temperature displays a strong dependence on the Z element [4,61]. Khan et al [62] specifically studied the effect of isoelectronic substitution of Ga by In in Ni 2 MnGa and concluded that the effect of Z on M s mainly arise from the change of unit cell volume which modifies the relative position of the Brillouin zone boundary and Fermi surfaces.…”

Section: Discussionmentioning

confidence: 97%

Fe and Co selective substitution in Ni₂MnGa: Effect of magnetism on relative phase stability

Soto-Parra

Moya

Mañosa

et al. 2010

Philosophical Magazine

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“…Associated with the martensitic transition observed in these alloys several important functional properties such as shape memory effect, inverse magnetocaloric effect and magnetoresistance have been reported [1][2][3] . The martensitic and magnetic transitions in these alloys are composition dependent as they are highly sensitive to the valence electron concentration per atom (e/a) and Mn-Mn interatomic distances 4,5 . In the case of Indium (In) containing alloys, a large inverse magnetocaloric effect (IMCE) in polycrystalline state and significant magnetic field induced strain (MFIS) in single crystals have been reported 6,7 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Fe on the Martensitic Transition, Magnetic and Magnetocaloric Properties in Ni-Mn-In Melt-spun Ribbons

Kumar¹,

Rao²,

Muthu³

et al. 2016

Def. Sc. Jl.

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IntroductIonThe Ni-Mn-Y (Y = Ga, In, Sn, and Sb) based ferromagnetic Heusler alloys display first order martensitic transitions from cubic to tetragonal or orthorhombic structure upon cooling. Associated with the martensitic transition observed in these alloys several important functional properties such as shape memory effect, inverse magnetocaloric effect and magnetoresistance have been reported [1][2][3] . The martensitic and magnetic transitions in these alloys are composition dependent as they are highly sensitive to the valence electron concentration per atom (e/a) and Mn-Mn interatomic distances 4,5 . In the case of Indium (In) containing alloys, a large inverse magnetocaloric effect (IMCE) in polycrystalline state and significant magnetic field induced strain (MFIS) in single crystals have been reported 6,7 . Recently rapid quenching or melt spinning technique was attempted in various systems such as Ni-Fe-Ga, Ni-Mn-Y (Y = In, Al, Sn, and Ga) alloys [8][9][10][11] . The melt spinning technique has the advantage of producing strong textured polycrystalline ribbons. In the case of magnetic refrigeration applications the use of refrigerant materials in the form of thin films or ribbons can optimize the heat transfer between the working body and the heat-exchange fluid. Additional advantage of melt spun ribbons is that the thin ribbons reduces the eddy current losses and can be utilised at high frequencies. In the recent past, offstoichiometric Ni-Mn-In ribbons has gained lot of interest due to their intriguing martensitic phase transitions, microstructure, associated magnetic, magnetocaloric properties [12][13][14][15][16][17] . In the present study, off-stoichiometric Ni 47 Mn 40 In 13 ribbon composition which reported a large magnetic entropy change of 32 J/kg-K at RT was chosen and Mn was partially substituted by Fe 18. The objective of this work is to understand the effect of Fe on the martensitic transitions, magnetic and magnetocaloric properties in Ni-Mn-In ribbons. Hence, Ni 47 Mn 40-x Fe x In 13 (x = 1, 2, 3, and 5) ribbons were prepared through melt spinning route and studied. ExpErImEntal WorKFour Ni-Mn(Fe)-In alloys were prepared by arc-melting pure metals in an argon atmosphere. Subsequently they were induction melted in a quartz tube and ejected with a 1 bar pressure difference onto a copper wheel rotating at a surface velocity of 17 m/s. The process was carried out in argon environment. As-quenched ribbons were 1.5 mm -2 mm wide, 5 mm -18 mm long and 40 µm -45 µm thick. As-spun ribbons were annealed at 850 o C for 30 min in vacuum and quenched to room temperature using Argon gas. The crystal structure of the constituent phases were examined using an X-ray diffractometer (PHILIPS3121, Cu-K α λ = 1.54058 Ǻ). The compositions of the ribbons were determined by energy dispersive x-ray spectroscopy (EDX) and were found to be close to the nominal composition. The phase transitions between the martensite and austenite phases were determined by differential scanning calorimetry (DSC) with a cooling/he...

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Electronic aspects of the martensitic transition in Ni–Mn based Heusler alloys

Cited by 132 publications

References 7 publications

Phase diagram of Fe-doped Ni-Mn-Ga ferromagnetic shape-memory alloys

Phase diagram of Fe-doped Ni-Mn-Ga ferromagnetic shape-memory alloys

Fe and Co selective substitution in Ni₂MnGa: Effect of magnetism on relative phase stability

Effect of Fe on the Martensitic Transition, Magnetic and Magnetocaloric Properties in Ni-Mn-In Melt-spun Ribbons

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Electronic aspects of the martensitic transition in Ni–Mn based Heusler alloys

Cited by 132 publications

References 7 publications

Phase diagram of Fe-doped Ni-Mn-Ga ferromagnetic shape-memory alloys

Phase diagram of Fe-doped Ni-Mn-Ga ferromagnetic shape-memory alloys

Fe and Co selective substitution in Ni2MnGa: Effect of magnetism on relative phase stability

Effect of Fe on the Martensitic Transition, Magnetic and Magnetocaloric Properties in Ni-Mn-In Melt-spun Ribbons

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Fe and Co selective substitution in Ni₂MnGa: Effect of magnetism on relative phase stability