Recent developments in magnetocaloric materials

GschneidnerJr., K. A.; Pecharsky, V. K.; Tsokol, A. O.

doi:10.1088/0034-4885/68/6/r04

Cited by 3,284 publications

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References 244 publications

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“…[56] Magnetization measurements as functions of temperature and magnetic field were carried out, and ∆S was calculated using Maxwell's relation. [1][2][3] The maximal ∆S is about ∼ 22 J·kg −1 ·K −1 at ∼ 252 K under a field change of 0-5 T. This value roughly agrees with the ∆S (∼ 27 J·kg −1 ·K −1 , 7 T) obtained by using the ClausiusClapeyron relation and the DSC measurements for a close composition Ni 45 Co 5 Mn 36.6 In 13.4 . [47] Similarly, Gao et al [68] investigated the MCE associated with metamagnetic properties in another Co-doped composition Ni 43 NiMn-based metamagnetic Heusler alloys have attracted lots of attention due to their unusual multi-functional properties.…”

Section: Magnetocaloric Effect and Magnetoresistance In Codoped Metamsupporting

confidence: 80%

“…The location of the crossing points varies depending on the composition. For polycrystalline Ni 51.5 Mn 22.7 Ga 25.8 , it is located at 0.9 T. According to Maxwell's relation [1][2][3][4] …”

Section: Magnetic Entropy Change In Conventional Nimn-based Heusler Amentioning

confidence: 99%

“…Figure 11 shows the ∆S as a function of temperature and magnetic field calculated based on Maxwell's relations. [1][2][3] Note that the inverse ∆S peaks at T M and gradually broadens toward lower temperatures. The maximal ∆S is 33 J·kg −1 ·K −1 , 20 J·kg −1 ·K −1 , and 19 J·kg −1 ·K −1 at 308 K, 262 K, and 253 K under a field change of 0-5 T for compositions x = 15.6, 16.0, and 16.2, respectively.…”

Section: Magnetocaloric Effect and Magnetoresistance In Codoped Metammentioning

confidence: 99%

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Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys

Hu¹,

Shen²,

Sun³

2013

Chinese Phys. B

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Our recent progress on magnetic entropy change (∆S) involving martensitic transition in both conventional and metamagnetic NiMn-based Heusler alloys is reviewed. For the conventional alloys, where both martensite and austenite exhibit ferromagnetic (FM) behavior but show different magnetic anisotropies, a positive ∆S as large as 4.1 J·kg −1 ·K −1 under a field change of 0-0.9 T was first observed at martensitic transition temperature T M ∼ 197 K. Through adjusting the Ni:Mn:Ga ratio to affect valence electron concentration e/a, T M was successfully tuned to room temperature, and a large negative ∆S was observed in a single crystal. The −∆S attained 18.0 J·kg −1 ·K −1 under a field change of 0-5 T. We also focused on the metamagnetic alloys that show mechanisms different from the conventional ones. It was found that post-annealing in suitable conditions or introducing interstitial H atoms can shift the T M across a wide temperature range while retaining the strong metamagnetic behavior, and hence, retaining large magnetocaloric effect (MCE) and magnetoresistance (MR). The melt-spun technique can disorder atoms and make the ribbons display a B2 structure, but the metamagnetic behavior, as well as the MCE, becomes weak due to the enhanced saturated magnetization of martensites. We also studied the effect of Fe/Co co-doping in Ni 45 (Co 1−x Fe x ) 5 Mn 36.6 In 13.4 metamagnetic alloys. Introduction of Fe atoms can assist the conversion of the Mn-Mn coupling from antiferromagnetic to ferromagnetic, thus maintaining the strong metamagnetic behavior and large MCE and MR. Furthermore, a small thermal hysteresis but significant magnetic hysteresis was observed around T M in Ni 51 Mn 49−x In x metamagnetic systems, which must be related to different nucleation mechanisms of structural transition under different external perturbations.

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Section: Magnetocaloric Effect and Magnetoresistance In Codoped Metamsupporting

confidence: 80%

Section: Magnetic Entropy Change In Conventional Nimn-based Heusler Amentioning

confidence: 99%

Section: Magnetocaloric Effect and Magnetoresistance In Codoped Metammentioning

confidence: 99%

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Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys

Hu¹,

Shen²,

Sun³

2013

Chinese Phys. B

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“…Manifestation of diverse magnetic properties by the rare earth (R) transition metal (TM) intermetallic compounds in general and the occurrence of giant MCE in materials such as Gd 5 (Si,Ge) 4 in particular have made R-TM compounds as the natural probe for the fundamental studies as well as for applications based on MCE [1,[7][8][9]. Among the various R-TM intermetallics, RCo 2 (R=Er, Ho and Dy) compounds are known to exhibit considerable MCE due to the first order transition at their ordering temperature (T C ) [8].…”

Section: Introductionmentioning

confidence: 99%

“…Among the various R-TM intermetallics, RCo 2 (R=Er, Ho and Dy) compounds are known to exhibit considerable MCE due to the first order transition at their ordering temperature (T C ) [8]. Another series which is quite promising is RNiAl.…”

Section: Introductionmentioning

confidence: 99%

Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni_1−xFe_x)₂compounds

Singh¹,

Суреш²,

Rana³

et al. 2006

J. Phys.: Condens. Matter

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Abstract. We report the magnetic, magnetocaloric and magnetoresistance results obtained in Tb(Ni 1-x Fe x ) 2 compounds with x=0, 0.025 and 0.05. Fe substitution leads to an increase in the ordering temperature from 36 K for x=0 to 124 K for x=0.05. Contrary to a single sharp MCE peak seen in TbNi 2 , the MCE peaks of the Fe substituted compounds are quite broad. We attribute the anomalous MCE behavior to the randomization of the Tb moments brought about by the Fe substitution. Magnetic and magnetoresistance results seem to corroborate this proposition. The present study also shows that the anomalous magnetocaloric and magnetoresistance behavior seen in the present compounds is similar to that of Ho(Ni,Fe) 2 compounds.

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Scandium, Yttrium and the Lanthanides: Applications

Cotton¹

2005

Encyclopedia of Inorganic Chemistry

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New applications are increasingly found for scandium, yttrium, and the lanthanides and their compounds. Among reagents in synthetic organic chemistry, LaNi 5 is a versatile hydrogenation catalyst. SmI 2 is an important one‐electron reducing agent, and lanthanide triflates, Ln(CF 3 OSO 3 ) 3 (Ln = Sc, Y, or lanthanide), are recyclable Lewis acid catalysts, which operate in aqueous conditions. Organocerium compounds are valuable, mild alkylating agents, while using cerium chloride in combination with NaBH 4 and LiAlH 4 permits a range of reductions to be carried out. (NH 4 ) 2 [Ce(NO 3 ) 6 ] is an established oxidant for which new applications are being found. The alloys SmCo 5 and Sm 2 Co 17 have been used to produce magnetic materials that are very powerful for their size, though partly superseded by cheaper Nd 2 Fe 14 B material, while strongly paramagnetic salts of Dy 3+ or Gd 3+ permit attainment of extremely low temperatures through adiabatic demagnetization. The mixed metal oxide YBa 2 Cu 3 O 7− x was the first material to superconduct above 77 K, revolutionizing understanding; new materials are being developed, most recently fluoride‐doped oxypnictides LaFeAsO. In addition to gadolinium complexes as MRI contrast agents, other lanthanide compounds find medicinal application, including cerium compounds in wound and burn treatment. In terms of quantity, the most important application of lanthanide compounds is lanthanide‐exchanged zeolites as catalysts in the petrochemical industry, notably in cracking, but cerium oxide is an important component of catalytic converters in automobile exhausts. The ability of LaNi 5 to absorb hydrogen reversibly has been vital to nickel–metal hydride (NiMH) batteries, while yttrium aluminum garnet (Y 3 Al 5 O 12 ) is widely used as a host material in lasers and phosphors. Yttria‐stabilized zirconia (YSZ) is a ceramic material used as the electrolyte material in solid oxide fuel cells (SOFCs) and in sensors in car exhaust systems.

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Recent developments in magnetocaloric materials

Cited by 3,284 publications

References 244 publications

Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys

Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys

Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni_1−xFe_x)₂compounds

Scandium, Yttrium and the Lanthanides: Applications

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Recent developments in magnetocaloric materials

Cited by 3,284 publications

References 244 publications

Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys

Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys

Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni1−xFex)2compounds

Scandium, Yttrium and the Lanthanides: Applications

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Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni_1−xFe_x)₂compounds