Structural and magnetic properties probed using neutron diffraction technique in Ni50−xCoxMn38Sb12 (x=0 and 5) Heusler system

Sahoo, Roshnee; Суреш, К. Г.; Das, Amitabh

doi:10.1016/j.jmmm.2014.07.031

Cited by 11 publications

(13 citation statements)

References 30 publications

(46 reference statements)

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“…When Ni is substituted, the net moment increases with y, albeit weakly, as Co moment is greater than that of Ni. 64 . For y = 0.5, we found that although the lowest energy magnetic configuration "C4", the energy difference between "C3" and "C4" is extremely low, even less than 1 meV per atom for Mn-substituted compound.…”

Section: B Magnetic Moments In the Austenite Phasesmentioning

confidence: 99%

“…Chemical substitution in Ni-Mn based ternary compounds has been proved to be an effective way to tune the stability of the austenite phase or in other words, to adjust T M and to increase ∆M . As discussed in Section I, different investigations conclude that Fe, Co, Cu substitutions at Mn and Ni sites in Mnexcess Ni-Mn-(Ga,In,Sn) alloys tune the thermodynamic parameters related to the magnetic and structural transformations and consequently the MCE [33][34][35][36]64,70 . Therefore, in this section, we have systematically investigated the effects of substitution of different elements with different concentrations and at various sites on the stability of the austenite phase of Ni 2 Mn 1.5 Sb 0.5 .…”

Section: Structural Phase Transition and Associated Change In Magnmentioning

confidence: 99%

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Understanding the origin of the magnetocaloric effects in substitutional Ni-Mn-Sb-Z(Z=Fe,Co,Cu) compounds: Insights from first-principles calculations

Ghosh

2020

Phys. Rev. B

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Ni-Mn based ternary Heusler compounds have drawn attentions lately as significant magnetocaloric effects in some of them have been observed. Substitution of Ni and Mn by other 3d transition metals in controlled quantity have turned out to be successful in enhancing the effect and bring the operational temperatures closer to the room temperature. Using density functional theory calculations, in this work, we have systematically explored the roles of various factors such as site occupancies, magnetic interactions, and compositions associated with the constituents of Mn-excess Ni2MnSb Heusler compounds upon substitution of Ni and/or Mn by 3d transition metals Fe, Co and Cu. Our calculations unveiled the physics behind the variations of physical properties associated with the magneto-caloric effects, and thus interpreted the available experimental results successfully. The work also provided important information on the compounds and the composition ranges where significant magneto-caloric effects may be realised and further experimental investigations need to be done.

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Section: B Magnetic Moments In the Austenite Phasesmentioning

confidence: 99%

Section: Structural Phase Transition and Associated Change In Magnmentioning

confidence: 99%

Understanding the origin of the magnetocaloric effects in substitutional Ni-Mn-Sb-Z(Z=Fe,Co,Cu) compounds: Insights from first-principles calculations

Ghosh

2020

Phys. Rev. B

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“…The crystal structure was determined by XRD (Rigaku SmartLab) using Cu K radiation ( = 1.540598 Å ) at room temperature. The crystal structure was resolved on the basis of the published structure model (Sahoo et al, 2014;Brown et al, 2010) using JANA2006 (Petříček et al, 2006). Microstructural observations and orientation analyses were performed using a JEOL 6500F field-emission gun scanning electron microscope (SEM) equipped with an electron backscatter diffraction (EBSD) camera and the AZTEC online acquisition software (Oxford Instruments).…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…So far, the analyses of the crystal structures of Ni-Mn-Sb alloys with compositions close to Ni 50 Mn 38 Sb 12 have been made using X-ray diffraction (XRD) (Sutou et al, 2004;Rao et al, 2009;Khan et al, 2008;Aksoy et al, 2009;Nayak et al, 2010), neutron diffraction (Sahoo et al, 2014) and transmission electron microscopy (Sutou et al, 2004). For austenite, the crystal structure has been well determined as the L2 1 cubic structure of space group Fm3m (No.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure and crystallographic characteristics of martensite in Ni₅₀Mn₃₈Sb₁₂ alloys

Zhang¹,

Yan²,

Zhang³

et al. 2016

J Appl Cryst

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For Ni-Mn-Sb ferromagnetic multifunctional alloys, the crystal structures of martensite variants and the orientation relationships between them are decisive factors for their magnetic field-induced behaviours and are hence of importance. Such information has rarely been reported in the literature. In the present work, the crystal structure, microstructure and orientation relationships of Ni-Mn-Sb martensite were thoroughly investigated by X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). Through XRD analyses, the crystal structure of the martensite, including the crystal system, the space group, the lattice parameters and the atomic coordinates, was fully resolved. The structure is orthorhombic and can be represented with a 4O superstructure. EBSD analyses show that the Ni-Mn-Sb martensite has a lamellar form. One martensite lamella corresponds to one orientation variant. The lamellae are organized in long plate-shaped colonies. Within each colony, four distinct orientation variants (A, B, C and D) appear repeatedly and extend in roughly the same direction. The four variants are twin related to one another, with variants A and C (or variants B and D) forming a type I twin, variants A and B (or C and D) a type II twin, and variants A and D (or B and C) a compound twin. The complete twinning elements for each twin relation were thus fully determined. The interfaces between the variants were identified to be their corresponding twinning planes. All these results provide fundamental information for Ni-Mn-Sb alloys that is useful for interpreting their magnetic and mechanical characteristics.

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“…4 In these compositions, the excess Mn occupies the Sb site(4b site), leading to an antiparallel alignment of moments between the Mn at 4a site and Mn at 4b site. 6 The martensitic transition is followed by a change in the magnetic state; this magnetostructural effect is the underlying reason for the functional properties. The martensitic transition and the multifunctional properties can be controlled by external parameters like temperature, pressure and magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Field dependent neutron diffraction study in Ni50Mn38Sb12 Heusler alloy

Sahoo

Das

Stuesser

et al. 2017

Applied Physics Letters

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Abstract:In this paper, we present temperature and field dependent neutron diffraction (ND) study to unravel the structural and the magnetic properties in Ni 50 Mn 38 Sb 12 Heusler system. This alloy shows martensitic transition from high temperature austenite cubic phase to low temperature martensite orthorhombic phase on cooling. At 3 K, the lattice parameters and magnetic moments are found to be almost insensitive to field.Just below the martensitic transition temperature, the martensite phase fraction is found to be 85%. Upon applying the field, the austenite phase becomes dominant, and the field induced reverse martensitic transition is clearly observed in the ND data.Therefore, the present study gives an estimate of the strength of the martensite phase or the sharpness of the martensitic transition. Variation of individual moments and the change in the phase fraction obtained from the analysis of the ND data vividly show the change in the magneto-structural state of the material across the transition.

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Structural and magnetic properties probed using neutron diffraction technique in Ni50−xCoxMn38Sb12 (x=0 and 5) Heusler system

Cited by 11 publications

References 30 publications

Understanding the origin of the magnetocaloric effects in substitutional Ni-Mn-Sb-Z(Z=Fe,Co,Cu) compounds: Insights from first-principles calculations

Understanding the origin of the magnetocaloric effects in substitutional Ni-Mn-Sb-Z(Z=Fe,Co,Cu) compounds: Insights from first-principles calculations

Crystal structure and crystallographic characteristics of martensite in Ni₅₀Mn₃₈Sb₁₂ alloys

Field dependent neutron diffraction study in Ni50Mn38Sb12 Heusler alloy

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Structural and magnetic properties probed using neutron diffraction technique in Ni50−xCoxMn38Sb12 (x=0 and 5) Heusler system

Cited by 11 publications

References 30 publications

Understanding the origin of the magnetocaloric effects in substitutional Ni-Mn-Sb-Z(Z=Fe,Co,Cu) compounds: Insights from first-principles calculations

Understanding the origin of the magnetocaloric effects in substitutional Ni-Mn-Sb-Z(Z=Fe,Co,Cu) compounds: Insights from first-principles calculations

Crystal structure and crystallographic characteristics of martensite in Ni50Mn38Sb12 alloys

Field dependent neutron diffraction study in Ni50Mn38Sb12 Heusler alloy

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Crystal structure and crystallographic characteristics of martensite in Ni₅₀Mn₃₈Sb₁₂ alloys