Unusual strain glassy phase in Fe doped Ni2Mn1.5In0.5

Nevgi, R.; Priolkar, K. R.

doi:10.1063/1.5004054

Cited by 12 publications

(17 citation statements)

References 13 publications

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“…2. This observation is consistent with earlier results of Fe doping in Ni-Mn based Heusler alloys [16,17,11]. The cubic composition Ni 1.8 Mn 1.5 Fe 0.2 In 0.5 does not seem to show any transition over the temperature range of 450K-150K as can be seen from Fig.…”

Section: Resultssupporting

confidence: 93%

“…Therefore, it would be interesting to explore the effect of site occupancy on the occurrence of strain glassy phase in Heusler alloys. Presence of strain glassy phase in Ni 2 Mn 1.5−x Fe x In 0.5 , wherein Fe is doped for Mn at the Y/Z site is already documented [11]. Here, we explore the effect of Fe doping at Ni (X) site in the same martensitic composition of Ni 2 Mn 1.5 In 0.5 to realize Ni 2−x Fe x Mn 1.5 In 0.5 (x = 0, 0.1, 0.15, 0.2).…”

Section: Introductionmentioning

confidence: 83%

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Importance of site occupancy and absence of strain glassy phase in Ni2−Fe Mn1.5In0.5

Nevgi

Das

Acet

et al. 2019

Journal of Alloys and Compounds

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Martensitic transition temperature steadily decreases in Ni 2−x Fe x Mn 1.5 In 0.5 and is completely suppressed at x = 0.2. Despite suppression of martensitic transition, Ni 1.8 Fe 0.2 Mn 1.5 In 0.5 does not display the expected strain glassy phase. Instead, a ground state with dominant ferromagnetic interactions is observed. A study of structural and magnetic properties of x = 0.2 reveal that the alloy consists of a major Fe rich cubic phase and a minor Fe deficient monoclinic phase favoring a ferromagnetic ground state. This is exactly opposite of that observed in Ni 2 Mn 1−y Fe y In 0.5 wherein a strain glassy phase is observed for y = 0.1. The change in site symmetry of Fe when doped for Ni in contrast to Mn in the Heusler composition seems to support the growth of the ferromagnetic phase.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 83%

Importance of site occupancy and absence of strain glassy phase in Ni2−Fe Mn1.5In0.5

Nevgi

Das

Acet

et al. 2019

Journal of Alloys and Compounds

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“…Competing ferromagnetic and antiferromagnetic interactions are responsible for the superparamagneticlike ground state [25,26] in these alloys. Impuritylike Fe doping in Ni-Mn-In alloys induces a transition from the ferroelastic ground state to a strain glass [27]. The ferroelastic/martensitic to strain glass transition usually occurs due to the formation of point defects when the dopant concentration exceeds a critical value [28].…”

Section: Introductionmentioning

confidence: 99%

Randomly packed Ni2MnIn and NiMn structural units in off-stoichiometric Ni2Mn2−y

2021

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Ni 2 Mn 2−y In y alloys transform from the martensitic L1 0 antiferromagnetic ground state near y = 0 to the austenitic ferromagnetic L2 1 Heusler phase near y = 1 due to doping of In impurity for Mn. The offstoichiometric alloys prepared by rapid quenching are structurally metastable and dissociate into a mixture of L2 1 (Ni 2 MnIn) and L1 0 (NiMn) phases upon temper annealing. Despite this structural disintegration, the martensitic transformation temperature remains invariant in the temper annealed alloys. Investigations of the local structure of the constituent atoms reveal the presence of strongly coupled Ni 2 MnIn and NiMn structural units in the temper annealed as well as the rapidly quenched off-stoichiometric Ni 2 Mn 2−y In y alloys irrespective of their crystal structure. This random packing of the L2 1 and L1 0 structural units seems to be responsible for invariance of martensitic transition temperature in the temper annealed alloys as well as the absence of strain glass transition in rapidly quenched alloys.

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“…Recent years have witnessed a lot of interest in understanding the precursor state of premartensite phase in the off-stoichiometric SMAs and MSMAs in relation to the occurrence of a fascinating strain glass state [48,55,56,[66][67][68][69][70][71][72] which bears close analogy with spin glasses [73], dipole glasses [74], and relaxors [75]. In this context, one of the most investigated systems is Ti 50 Ni 50−x Fe x , which for low concentrations of Fe shows austenite B2 phase to incommensurate premartensite-I phase (3R) to LRO commensurate R-phase (premartensite-II) to LRO martensite B19 phase (monoclinic) transitions with decreasing temperature [33,55,68,70].…”

Section: Introductionmentioning

confidence: 99%

Pair distribution function study ofNi2MnGamagnetic shape memory alloy: Evidence for the precursor state of the premartensite phase

Singh

Pandey

2021

Phys. Rev. B

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Precursor phenomena preceding the martensite phase transition play a critical role in understanding the important technological properties of shape memory and magnetic shape memory alloys (MSMAs). Since the premartensite phase of Ni 2 MnGa MSMA, earlier considered as the precursor state of the martensite phase, has in recent years been shown to be a thermodynamically stable phase, Singh et al. [Nat. Commun. 8, 1006(2017], there is a need to revisit the precursor effects in these materials. We present here evidence for the existence of a precursor state of the premartensite phase in Ni 2 MnGa MSMA by atomic pair distribution function analysis of high-energy, high-flux, and high-Q synchrotron x-ray powder diffraction data. It is shown that the local structure of the cubic austenite phase corresponds to the short-range ordered (SRO) precursor state of the 3M premartensite phase at temperatures well above the actual premartensite phase transition temperature T PM and even above the ferromagnetic (FM) transition temperature T C . The presence of such a SRO precursor state of the premartensite phase is shown to lead to significant volume strain, which scales quadratically with spontaneous magnetization. The experimentally observed first-order character of the paramagnetic-to-FM phase transition and the anomalous reduction in the value of the magnetization in the temperature range T PM < T < T C are explained in terms of the coupling of the magnetoelastic strain with the FM order parameter and the higher magnetocrystalline anisotropy of the precursor state of the premartensite phase, respectively.

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Unusual strain glassy phase in Fe doped Ni2Mn1.5In0.5

Cited by 12 publications

References 13 publications

Importance of site occupancy and absence of strain glassy phase in Ni2−Fe Mn1.5In0.5

Importance of site occupancy and absence of strain glassy phase in Ni2−Fe Mn1.5In0.5

Randomly packed Ni2MnIn and NiMn structural units in off-stoichiometric Ni2Mn2−y

Pair distribution function study ofNi2MnGamagnetic shape memory alloy: Evidence for the precursor state of the premartensite phase

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