The Magnetocaloric Effect and its Applications

Tishin, A.M.; Spichkin, Y.I.

doi:10.1887/0750309229

Cited by 1,185 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%

“…13 are the ∆S curves calculated based on Maxwell's relations. [1][2][3] With increasing magnetic field, the inverse ∆S peak gradually broadens toward lower temperatures. The maximal ∆S is 17.…”

Section: Interstitial Effect On Magnetic Properties and Magnetic Entrmentioning

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%

Section: Interstitial Effect On Magnetic Properties and Magnetic Entrmentioning

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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“…With recent interest in first order magnetic phase transitions for room temperature refrigeration, 1,2,3 certain classes of materials have generated much attention. In particular, the cubic NaZn 13 -type La(Fe,Si) 13 4 and the hexagonal Fe 2 P-type Mn x Fe 1.95-x P 1-y Si y 5 -both of which are itinerant electron metamagnets (IEM) -show significant promise.…”

Section: Introductionmentioning

confidence: 99%

Identifying the critical point of the weakly first-order itinerant magnet DyCo2with complementary magnetization and calorimetric measurements

et al. 2013

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We examine the character of the itinerant magnetic transition of DyCo 2 by different calorimetric methods, thereby separating the heat capacity and latent heat contributions to the entropyallowing direct comparison to other itinerant electron metamagnetic systems. The heat capacity exhibits a large lambda-like peak at the ferrimagnetic ordering phase transition, a signature that is remarkably similar to La(Fe,Si) 13 where it is attributed to giant spin fluctuations. Using calorimetric measurements we also determine the point at which the phase transition ceases to be first order: the critical field, µ 0 H crit = 0.4±0.1 T and T crit = 138.5±0.5 K, and we compare these to values obtained from analysis of magnetization by application of the Shimizu inequality for itinerant electron metamagnetism. Good agreement is found between these independent measurements, thus establishing the phase diagram and critical point with some confidence. In addition we find that the often-used Banerjee criterion may not be suitable for determination of first order behavior in itinerant magnet systems. PACS number(s):

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Electrocaloric Effect: Theory, Measurements, and Applications

Kutnjak

Rožič

Pirc

2015

Wiley Encyclopedia of Electrical and Electronics Engineering

101

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The electrocaloric effect (ECE) is a physical phenomenon found in materials with dipolar constituents, that is, with certain dielectric properties. It is manifested in the heating or cooling of an electrocaloric material due to the applied electric field under adiabatic conditions. Electrocaloric effect has been known for many decades; however, the relatively small ECE observed below 2.5 K made it unsuitable for practical applications. Recently, however, materials with large ECE have been predicted and discovered, thus opening the possibility of realizing dielectric refrigeration that has several potential advantages in comparison with other cooling technologies. This chapter provides an extensive introduction to the field, including the basic theory of the electrocaloric phenomenon in ferroelectric, relaxor ferroelectric, and antiferroelectric materials. In addition, a review of various ECE experimental techniques, including indirect and direct experimental techniques, is given together with examples of recent findings obtained in polymeric, perovskite ceramic relaxor, and ferroelectric materials. An overview of various possibilities of the application of the ECE, the comparison with thermoelectric and magnetoelectric materials, and the state of the art of the cooling/heating devices is also presented.

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The Magnetocaloric Effect and its Applications

Cited by 1,185 publications

References 0 publications

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

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

Identifying the critical point of the weakly first-order itinerant magnet DyCo2with complementary magnetization and calorimetric measurements

Electrocaloric Effect: Theory, Measurements, and Applications

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