Crystal structure determination of incommensurate modulated martensite in Ni–Mn–In Heusler alloys

Yan, Haile; Zhang, Yudong; Xu, Nan; Senyshyn, Anatoliy; Brokmeier, Heinz Günter; Esling, Claude; Zhao, Xiang; Zuo, Liang

doi:10.1016/j.actamat.2015.01.025

Cited by 87 publications

(62 citation statements)

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“…The NiMn has an L1 0 -type tetragonal structure with lattice parameters of a = 0.374 and c = 0.352 nm, and it transforms to B2-type cubic one at the martensitic transformation temperature [15]. With increasing the In concentration, the crystal structure of M phase varies to 14 M and 10 M stacking monoclinic structures [14,18,19]. The straight line in the M-H curves (Figure 1a) is characteristic of the antiferromagnetic properties.…”

Section: Methodsmentioning

confidence: 97%

Evidence of Change in the Density of States during the Martensitic Phase Transformation of Ni-Mn-In Metamagnetic Shape Memory Alloys

Umetsu

Ito

et al. 2017

Metals

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Specific heat measurements were performed at low temperatures for Ni 50 Mn 50−x In x alloys to determine their Debye temperatures (θ D ) and electronic specific heat coefficients (γ). For x ≤ 15, where the ground state is the martensite (M) phase, θ D decreases linearly and γ increases slightly with increasing In content. For x ≥ 16.2, where the ground state is the ferromagnetic parent (P) phase, γ increases with decreasing In content. Extrapolations of the composition dependences of θ D and γ in both the phases suggest that these values change discontinuously during the martensitic phase transformation. The value of θ D in the M phase is larger than that in the P phase. The behavior is in accordance with the fact that the volume of the M phase is more compressive than that of the P phase. On the other hand, γ is slightly larger in the P phase, in good agreement with the reported density of states around the Fermi energy obtained by the first-principle calculations.

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Section: Methodsmentioning

confidence: 97%

Evidence of Change in the Density of States during the Martensitic Phase Transformation of Ni-Mn-In Metamagnetic Shape Memory Alloys

Umetsu

Ito

et al. 2017

Metals

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“…EBSD patterns of bulk Ni 2 Mn 1.44 In 0.56 are shown in Figure 19a for an incommensurate 6 M modulated martensite, and the calculated Kikuchi lines (solid red) can be seen from Figure 19b [142]. The main and satellite reflections are highlighted by the white dashed line.…”

Section: Methods Of Synthesis and Characterizationmentioning

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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“…However, the residual stresses in the powder do not affect the general characteristics of the material. Ambient pressure XRD data confirm a cubic austenitic phase with lattice parameter a = 6.00509(7)Å at high temperatures, while the low-temperature martensitic phase is a complex modulated structure [14,16]. The XRD experiments under pressure were performed between 1.5 and 5 GPa.…”

Section: Tails [16]mentioning

confidence: 99%

“…In Ni-Mn-Z (Z = In, Sb, Sn), application of a small pressure p < ∼ 1 GPa stabilizes the martensitic phase and, therefore, the martensitic transition temperature increases strongly upon increasing pressure, while the effect on the Curie temperature in the austenitic phase, T A C , is rather small [10][11][12][13]. In closely related compounds, it has been reported that low pressures can improve the magnetocaloric effect [13] or lead to a large barocaloric effect [6].At ambient pressure, the shape-memory Heusler alloy Ni 50 Mn 35 In 15 undergoes on cooling a paramagnetic to FM transition at T A C ≈ 313 K, followed by a first-order martensitic structural transformation from a cubic high-temperature to a low-temperature modulated structure [14] at T M ≈ 248 K [5,15]. On heating the reverse martensitic transition takes place at T A ≈ 261 K. The magnetostructural transition drives the material from the FM state to a state with a small remaining magnetization.…”

mentioning

confidence: 99%

“…At ambient pressure, the shape-memory Heusler alloy Ni 50 Mn 35 In 15 undergoes on cooling a paramagnetic to FM transition at T A C ≈ 313 K, followed by a first-order martensitic structural transformation from a cubic high-temperature to a low-temperature modulated structure [14] at T M ≈ 248 K [5,15]. On heating the reverse martensitic transition takes place at T A ≈ 261 K. The magnetostructural transition drives the material from the FM state to a state with a small remaining magnetization.…”

mentioning

confidence: 99%

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Suppression of the ferromagnetic order in the Heusler alloy Ni50Mn35In15 by hydrostatic pressure

Mejía

Mydeen

Naumov

et al. 2016

Applied Physics Letters

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We report the effect of hydrostatic pressure on the magnetic and structural properties of the shape-memory Heusler alloy Ni 50 Mn 35 In 15 . Magnetization and x-ray diffraction experiments were performed at hydrostatic pressures up to 5 GPa using diamond anvil cells. Pressure stabilizes the martensitic phase, shifting the martensitic transition to higher temperatures and suppresses the ferromagnetic austenitic phase. Above ∼ 3 GPa, where the martensitic-transition temperature approaches the Curie temperature in the austenite, the magnetization shows no indication of ferromagnetic ordering anymore. We further find an extremely large temperature region with a mixture of martensite and austenite phases, which directly relates to the magnetic properties.Heusler alloys which exhibit a martensitic structural transformation in proximity to a ferromagnetic (FM) phase have attracted much attention due to the multiple functional properties connected to the coupling of the structural transition to magnetic degrees of freedom, such as shape memory [1][2][3], magnetocaloric [4,5], and barocaloric effects [6]. In the austenitic phase in NiMn-based alloys the Mn moments order ferromagnetically, which arises mainly due to the RKKYexchange interaction [7][8][9]. In the martensitic state, which can form in a simple tetragonal, a complex monoclinic, or an orthorhombic layered structure, a strong competition between FM and antiferromagnetic interactions exists, leading to a high sensitivity of the physical properties on the interatomic distances. The application of pressure is, therefore, an important tool to study the relationship of magnetism and crystal structure, without altering the intrinsic properties unintentionally, or introducing additional disorder in the structure, like in the case of element substitution. In Ni-Mn-Z (Z = In, Sb, Sn), application of a small pressure p < ∼ 1 GPa stabilizes the martensitic phase and, therefore, the martensitic transition temperature increases strongly upon increasing pressure, while the effect on the Curie temperature in the austenitic phase, T A C , is rather small [10][11][12][13]. In closely related compounds, it has been reported that low pressures can improve the magnetocaloric effect [13] or lead to a large barocaloric effect [6].At ambient pressure, the shape-memory Heusler alloy Ni 50 Mn 35 In 15 undergoes on cooling a paramagnetic to FM transition at T A C ≈ 313 K, followed by a first-order martensitic structural transformation from a cubic high-temperature to a low-temperature modulated structure [14] at T M ≈ 248 K [5,15]. On heating the reverse martensitic transition takes place at T A ≈ 261 K. The magnetostructural transition drives the material from the FM state to a state with a small remaining magnetization. Upon further cooling ferrimagnetic order develops in the martensitic phase below T M C ≈ 200 K [5,15]. In this Letter, we study the effect of hydrostatic pressure on the magnetic and structural properties of the Heusler alloy Ni 50 Mn 35 In 15 . While the FM transitio...

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Crystal structure determination of incommensurate modulated martensite in Ni–Mn–In Heusler alloys

Cited by 87 publications

References 51 publications

Evidence of Change in the Density of States during the Martensitic Phase Transformation of Ni-Mn-In Metamagnetic Shape Memory Alloys

Evidence of Change in the Density of States during the Martensitic Phase Transformation of Ni-Mn-In Metamagnetic Shape Memory Alloys

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

Suppression of the ferromagnetic order in the Heusler alloy Ni50Mn35In15 by hydrostatic pressure

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