Phase transition processes and magnetocaloric effect in Ni2.15Mn0.85−xCoxGa alloys

Bao, Bo; Long, Yi; Duan, Jingfang; Shi, Peng; Wu, Guangheng; Ye, R. C.; Chang, Yuqing; Zhang, J.; Rong, Chuanbing

doi:10.1063/1.2838769

Cited by 9 publications

(4 citation statements)

References 16 publications

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“…For example, Co substitution is found to reduce the entropy change from 20 J/kg K in Ni 50 Mn 37 Sn 13 to 9 J/kg K in Ni 47 Co 3 Mn 37 Sn 13 [8]. A similar decrease is reported in Ni-Co-Mn-Ga as well [19].…”

Section: Resultssupporting

confidence: 61%

Giant inverse magnetocaloric effect near room temperature in Co substituted NiMnSb Heusler alloys

Nayak¹,

Суреш²,

Nigam³

2009

J. Phys. D: Appl. Phys.

113

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The effect of Co on the structural, magnetic and magnetocaloric effect (MCE) of Ni 50-x Co x Mn 38 Sb 12 (x=0,2,3,4,5) Heusler alloys was studied. Using x-ray diffraction, we show the evolution of the martensitic phase from the austenite phase. The martensitic transition temperature is found to decrease monotonically with Co concentration. Remarkable enhancement of MCE is observed near room temperature upon Co substitution. The maximum magnetic entropy change of 34 Jkg -1 K -1 was achieved in x=5 at 262 K in a field of 50 kOe and a value of 29 Jkg -1 K -1 found near room temperature. The significant increase in the magnetization associated with the reverse martensitic transition is responsible for the giant MCE in these compounds. Recently there has been a great interest in Ni-Mn based Heusler alloys because of the observation of first order martensitic transformation around room temperature. These alloys received a lot of attention for showing both magnetic shape memory effect and large magnetocaloric effect [6-8]. Among the Heusler alloys, the highest MCE has been reported in Ni 55 Mn 20 Ga 25 single crystals (∆S M = -86Jkg -1 K -1 in a field of 50kOe), which is due to the coincidence of first order structural transition and the magnetic transition [7]. Other materials showing promising MCE from the Ni-Mn family are Ni-Mn-Sn [9], Ni-Mn-In [10] and Ni 12]. All these alloys generally show inverse (negative) MCE, i.e., the entropy change is positive on applying the magnetic field. It is reported that Ni-Mn-Sb based Heusler alloys undergo first order magneto-structural transition from martensite phase (tetragonal or orthorhombic) to austenite phase (cubic), resulting

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Section: Resultssupporting

confidence: 61%

Giant inverse magnetocaloric effect near room temperature in Co substituted NiMnSb Heusler alloys

Nayak¹,

Суреш²,

Nigam³

2009

J. Phys. D: Appl. Phys.

113

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“…A large magnetic field-induced shape memory effect has been found in Ni 45 Co 5 Mn 36.7 In 11.3 single crystals [12]. Similar magnetic and magnetocaloric properties have been reported in Ni-Co-Mn-Sn [13], Ni-Co-Mn-Ga [14] and Ni-Co-Mn-Sb [15] systems.…”

Section: Introductionsupporting

confidence: 55%

Magneto-thermal and magneto-transport behavior around the martensitic transition in Ni50−Co Mn40Sb10 (x= 9, 9.5) Heusler alloys

Nayak

Rao

Суреш

et al. 2010

Journal of Alloys and Compounds

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“…The number of valence electrons for Ni, Mn, Co, and Sn atoms are 10 (3d 8 4s 2 ), seven (3d 5 4s 2 ), nine (3d 7 4s 2 ), and four (5s 2 5p 2 ), respectively. The e/a value of Ni-Mn-Co-Sn alloys is calculated by the following equation [30]:…”

Section: Resultsmentioning

confidence: 99%

The Effect of Different Atomic Substitution at Mn Site on Magnetocaloric Effect in Ni50Mn35Co2Sn13 Alloy

Xing,

Zhang,

Long

et al. 2018

Crystals

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The effect of different atomic substitutions at Mn sites on the magnetic and magnetocaloric properties in Ni50Mn35Co2Sn13 alloy has been studied in detail. The substitution of Ni or Co for Mn atoms might lower the Mn content at Sn sites, which would reduce the d-d hybridization between Ni 3d eg states and the 3d states of excess Mn atoms at Sn sites, thus leading to the decrease of martensitic transformation temperature TM in Ni51Mn34Co2Sn13 and Ni50Mn34Co3Sn13 alloys. On the other hand, the substitution of Sn for Mn atoms in Ni50Mn34Co2Sn14 would enhance the p-d covalent hybridization between the main group element (Sn) and the transition metal element (Mn or Ni) due to the increase of Sn content, thus also reducing the TM by stabilizing the parent phase. Due to the reduction of TM, a magnetostructural martensitic transition from FM austenite to weak-magnetic martensite is realized in Ni51Mn34Co2Sn13 and Ni50Mn34Co2Sn14, resulting in a large magnetocaloric effect around room temperature. For a low field change of 3 T, the maximum ∆SM reaches as high as 30.9 J/kg K for Ni50Mn34Co2Sn14. A linear dependence of ΔSM upon μ0H has been found in Ni50Mn34Co2Sn14, and the origin of this linear relationship has been discussed by numerical analysis of Maxwell’s relation.

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Phase transition processes and magnetocaloric effect in Ni2.15Mn0.85−xCoxGa alloys

Cited by 9 publications

References 16 publications

Giant inverse magnetocaloric effect near room temperature in Co substituted NiMnSb Heusler alloys

Giant inverse magnetocaloric effect near room temperature in Co substituted NiMnSb Heusler alloys

Magneto-thermal and magneto-transport behavior around the martensitic transition in Ni50−Co Mn40Sb10 (x= 9, 9.5) Heusler alloys

The Effect of Different Atomic Substitution at Mn Site on Magnetocaloric Effect in Ni50Mn35Co2Sn13 Alloy

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