Investigation of the influence of hydrostatic pressure on the magnetic and magnetocaloric properties of Ni2−XMn1+XGa (X = 0, 0.15) Heusler alloys

Devarajan, U.; Muthu, S. Esakki; Arumugam, S.; Singh, Sanjay; Barman, S. R.

doi:10.1063/1.4817250

Cited by 27 publications

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References 39 publications

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“…The effect of magnetic field and hydrostatic pressure on T M and T PM on Ni 2 MnGa system has been already reported. 17,33 Similar q (T) has been observed for X ¼ 0.15 (Figure 1(b)), where the application of pressure increases the q due to the pressure induced phase transformation, which indicates the phase changes from pre-martensite to martensite. 25,26 However, overall q for X ¼ 0.15 is lower than X ¼ 0.…”

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“…On the contrary, for Ni 1.85 Mn 1.15 Ga (T M ¼ 138 K), T M is reduced at the rate of À10.8 K/GPa under constant hydrostatic pressure and magnetic field. 16,17 Temperature dependent electrical resistivity q(T), which is often used to distinguish metals from insulators and also band-gap insulators from the Anderson localized insulators, has been investigated for some of the Ni-Mn-Ga based Heusler alloys such as Ni 2 MnGa 1ÀX B X (X ¼ 0.03 and 0.05), 18 Ni 2 MnGa 1ÀX In X (X ¼ 0.05-0.15), 4 Ni 2. 16 Mn 0.84 Ga alloy, 19 20,21 and Ni 49.5 Mn 25.4 Ga 25.1 , Ni 51.1 Mn 24.9 Ga 24 alloys.…”

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Investigations on the electronic transport and piezoresistivity properties of Ni2−XMn1+XGa (X = 0 and 0.15) Heusler alloys under hydrostatic pressure

Devarajan

Singh

Muthu

et al. 2014

Applied Physics Letters

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The resisitivity of Ni2−XMn1+XGa (X = 0 and 0.15) magnetic shape memory alloys has been investigated as a function of temperature (4–300 K) and hydrostatic pressure up to 30 kilobars. The resistivity is suppressed (X = 0) and enhanced (X = 0.15) with increasing pressure. A change in piezoresistivity with respect to pressure and temperature is observed. The negative and positive piezoresistivity increases with pressure for both the alloys. The residual resistivity and electron-electron scattering factor as a function of pressure reveal that for Ni2MnGa the electron-electron scattering is predominant, while the X = 0.15 specimen is dominated by the electron-magnon scattering. The value of electron-electron scattering factor is positive for both the samples, and it is decreasing (negative trend) for Ni2MnGa and increasing (positive trend) for X = 0.15 with pressure. The martensite transition temperature is found to be increased with the application of external pressure for both samples.

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Investigations on the electronic transport and piezoresistivity properties of Ni2−XMn1+XGa (X = 0 and 0.15) Heusler alloys under hydrostatic pressure

Devarajan

Singh

Muthu

et al. 2014

Applied Physics Letters

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“…Magnetic and magnetocaloric properties of these alloys are strongly influenced by Mn-Mn exchange interaction, which can be altered by either chemical substitution or applying pressure . Recently effect of pressure on magnetic and magnetocaloric properties of many Ni rich Ni-Mn-Z alloys have been reported [4][5] . However, no such reports are available on Mn rich Mn-Ni-Z (Z= Ga, Sn and In) Heusler alloys .…”

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“…For calculating ∆S M at different pressures, isothermal magnetization (M-H) curves around martensitic transition with a temperature interval of 2 K, at different pressures have been recorded (data not shown here) . ∆S M at different pressures has been calculated using Maxwell's thermodynamic relation [4] . Fig .…”

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Effect of hydrostatic pressure on martensitic transition, magnetic and magnetocaloric properties of Mn rich Mn-Ni-Sn Heusler alloy

Sharma

Coelho

Суреш

2015

2015 IEEE Magnetics Conference (INTERMAG)

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I. INTRODUCTIONIn recent years Ni-Mn-Z (Z= Ga, Sn, Sb and In) Heusler alloys have attracted enormous attention owing to their multifunctional properties such as shape memory effect, giant magnetocaloric effect (MCE) and large magnetoresistance, which result from first order martensitic transition from austenite phase to martensite phase [1][2][3] . Among these properties, MCE is the most prominent as materials showing large MCE near room temperature (RT) are being considered as promising candidates for solid state cooling technology . Magnetic and magnetocaloric properties of these alloys are strongly influenced by Mn-Mn exchange interaction, which can be altered by either chemical substitution or applying pressure . Recently effect of pressure on magnetic and magnetocaloric properties of many Ni rich Ni-Mn-Z alloys have been reported [4][5] . However, no such reports are available on Mn rich Mn-Ni-Z (Z= Ga, Sn and In) Heusler alloys . In present study, we have investigated the effect of hydrostatic pressure on martensitic transition, magnetic and magnetocaloric properties of Mn rich Mn 50 Ni 41 Sn 9 Heusler alloy . II. EXPERIMENTAL DETAILSPolycrystalline sample of Mn 50 Ni 41 Sn 9 alloy was prepared by arc melting method . RT x-ray diffraction pattern shows tetragonal structure with lattice parameters as a= b= 3 .86 Å and c= 6 .59 Å (as reported in our previous work) [6] . The magnetization measurements at different applied pressures (P) have been performed using a superconducting quantum interference device magnetometer attached with a Cu-Be clamp type pressure cell with a maximum pressure of 10 .4 kbar . Fig . 1 shows the temperature dependence of magnetization (M vs . T curves) for Mn 50 Ni 41 Sn 9 alloy measured at 100 Oe field in ZFC and FC modes, with different applied hydrostatic pressures . Inset of Fig . 1 shows M vs . T curves with an expanded scale (in martensitic transition region), for better clarity . The alloy undergoes martensitic transition with a sudden decrease in magnetization at ~ RT, which corresponds to martensitic start temperatures (M S ) and attains its minimum value at ~ 277 K, which is the martensitic finish temperature (M f ) . With the further decrease of temperature, a splitting between ZFC and FC curves has been observed, which becomes more pronounced with lowering the temperature . This splitting is attributed to the coexistence of AFM and FM exchange interactions present in the alloy . It is clear from figure that, martensitic transition temperature (M S or M f ) increases with increase in pressure, which is attributed to stabilization of martensite phase, as M S ~ 299 K for P = 0 kbar and increases to M S ~ 339 K for P = 10 .4 kbar .Unlike the effect of pressure, effect of applied magnetic field on martensitic transition temperature (as observed from the M vs . T curves, data not shown here), shows a decrease in martensitic transition temperature with applied field, which is attributed to the stabilization of austenite phase . The effect of hydrostatic pressure on MCE has been ...

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“…Barocaloric effect as a function of temperature[33].In a separate study, the entropy change decreased from 19.2 to 6.04 J/kgK while pressure increased from 0 to 9.69 kbar in Ni 2 MnGa. In offstoichiometric Ni 1.85 Mn 1.15 Ga, the entropy change decreased from 8.9 to 1.27 J/kgK, while pressure increased from 0 to 7.4 kbar as can be seen inFigure 1.14[34]. High pressure causes a decrease in the magnetization difference between the martensite and austenite phases.…”

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Novel In Situ Study of Magnetocaloric Heusler Alloy

Moshaie¹

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The objective of this research was to develop a novel technique for mechanical treatment to manipulate the microstructure of Nickel-Manganese-Gallium Hesuler alloys to increase anisotropy, which can lead to higher magnetocaloric properties. Ni 2+x Mn 1-x Ga intermetallics have the potential to be employed in magnetic refrigeration devices including residential refrigerators, heat pumps, and air conditioning. Solid-state magnetic refrigeration systems are smaller, quieter, and reduce energy consumption by 20% compared to existing conventional vapor-cycle refrigeration devices which rely on harmful hydro-fluorocarbon gases and pump millions of tons of greenhouse gases into the atmosphere. The magnetic refrigeration market is predicted to reach US$ 315.7 Million by 2022. Magnetic refrigeration systems can also be used in electronic systems and the space industry. The current state-of-the-art magnetic refrigeration systems use expensive rare earth elements including Gadolinuim (Gd). The need to replace Gd and other rare earth elements with cheaper and more available elements led to other alloys including Ni-Mn-Ga. By understanding the processing-microstructure-property relationship of Ni-Mn-Ga alloy, it is possible to manipulate the microstructure in order to obtain higher refrigeration ix capacity. It is a promising alternative to rare earth elements and improves national security by minimizing foreign dependence on the import of rare earth metals. This novel in situ study establishes that twin boundaries can be manipulated in a polycrystalline Ni-Mn-Ga alloy. This results in a change in magnetocrsytalline anisotropy, which leads to a higher magnetic cooling power. Mechanical loading in a preferred direction, traditionally referred to as a training process, was able to move the twin boundaries, and the combination of focused ion beam imaging linked specific movement with mechanical loading. This technique, in situ monitoring process, can be utilized to devise training procedures for future iterations of magnetocaloric and shape memory alloys. x

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Investigation of the influence of hydrostatic pressure on the magnetic and magnetocaloric properties of Ni2−XMn1+XGa (X = 0, 0.15) Heusler alloys

Cited by 27 publications

References 39 publications

Investigations on the electronic transport and piezoresistivity properties of Ni2−XMn1+XGa (X = 0 and 0.15) Heusler alloys under hydrostatic pressure

Investigations on the electronic transport and piezoresistivity properties of Ni2−XMn1+XGa (X = 0 and 0.15) Heusler alloys under hydrostatic pressure

Effect of hydrostatic pressure on martensitic transition, magnetic and magnetocaloric properties of Mn rich Mn-Ni-Sn Heusler alloy

Novel In Situ Study of Magnetocaloric Heusler Alloy

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