Negative magnetocaloric effect at the antiferromagnetic to ferromagnetic transition of Mn3GaC

Tohei, Tetsuya; Wada, Hirofumi; Kanomata, T.

doi:10.1063/1.1587265

Cited by 195 publications

(138 citation statements)

References 14 publications

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“…Materials showing the first-order magnetic transition are now attracting because of their possible application to solid magnetic refrigeration. [25][26][27] …”

Section: Resultsmentioning

confidence: 99%

Magnetovolume Effect and Negative Thermal Expansion in Mn3(Cu1−xGex)N

Takenaka

Takagi

2006

Mater. Trans.

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Metallic manganese nitrides Mn 3 AN (A ¼ Zn, Ga, etc) are well-known for their large magnetovolume effect (MVE), i.e., a discontinuous volume expansion at the magnetic transition. However, MVE is exceptionally absent in Mn 3 CuN. We found that MVE is recovered by a small amount of Ge in the Cu site. This revival seems to coincide with recovery of the cubic structure. By further Ge doping, the volume expansion becomes gradual (ÁT $ 100 K) and large negative thermal expansion (NTE) is exhibited around room temperature [ ¼ À12 Â 10 À6 K À1 (: coefficient of linear thermal expansion) for Mn 3 (Cu 0:5 Ge 0:5 )N]. Such a large, isotropic and non-hysteretic NTE is desirable for practical applications.

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“…Materials showing the first-order magnetic transition are now attracting because of their possible application to solid magnetic refrigeration. [25][26][27] …”

Section: Resultsmentioning

confidence: 99%

Magnetovolume Effect and Negative Thermal Expansion in Mn3(Cu1−xGex)N

Takenaka

Takagi

2006

Mater. Trans.

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“…The volume change reaches 2%, which is among the largest for magnetic metals, next to 4% volume change in YMn 2 [44]. Manganese antiperovskites exhibit many other advantageous features such as magnetostriction [61][62][63], magnetocaloric effects [64,65], magnetoresistance effects [66,67], and a low temperature coefficient of resistance [68][69][70], and hence attract great attention as a reservoir of functionalities.…”

Section: Methodsmentioning

confidence: 99%

Negative thermal expansion materials: technological key for control of thermal expansion

Takenaka

2012

Science and Technology of Advanced Materials

489

311

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Most materials expand upon heating. However, although rare, some materials contract upon heating. Such negative thermal expansion (NTE) materials have enormous industrial merit because they can control the thermal expansion of materials. Recent progress in materials research enables us to obtain materials exhibiting negative coefficients of linear thermal expansion over −30 ppm K −1 . Such giant NTE is opening a new phase of control of thermal expansion in composites. Specifically examining practical aspects, this review briefly summarizes materials and mechanisms of NTE as well as composites containing NTE materials, based mainly on activities of the last decade.

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“…Figure 4 shows the isofield thermomagnetic curves constructed from the isothermal magnetization data. Preserving the highly sensitive metamagnetic transition, the metamagnetic transition can be induced by applying a field of about 5 T at 50 K which is far below T t and the average ⁄ is about -25 K/T which is significantly larger than than of FeRh (-8K/T) [22] and Mn 3 GaC (-5K/T) [23]. Figure 5 (a) and (b) present, respectively, the temperature dependences of the isothermal entropy change Δ calculated using Maxwell relations around T c (for x=0.35) and around T t (for x=0.1).…”

Section: Figure 3 Magnetic Phase Diagram (The Main Plot) For X=01 Cmentioning

confidence: 99%

Wide temperature span of entropy change in first-order metamagnetic MnCo_1−xFe_xSi

Xu¹,

Yang²,

Du³

et al. 2014

J. Phys. D: Appl. Phys.

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Abstract. The crystal structure and magnetic properties of MnCo x Fe 1-x Si (x=0-0.5) compounds were investigated. With increasing Fe content, the unit cell changes anisotropically and the magnetic property evolves gradually: Curie temperature decreases continuously, the first-order metamagnetic transition from a low-temperature helical antiferromagnetic state to a high-temperature ferromagnetic state disappears gradually and then a spin-glass-like state and another antiferromagnetic state emerge in the low temperature region. The Curie transition leads to a moderate conventional entropy change. The metamagnetic transition not only yields a larger negative magnetocaloric effect at lower applied fields than in MnCoSi but also produces a very large temperature span (103 K for Δμ 0 H=5 T) of ∆ (T) , which results in a large refrigerant capacity. These phenomena were explained in terms of crystal structure change and magnetoelastic coupling mechanism. The low-cost MnCo 1-x Fe x Si compounds are promising candidates for near room temperature magnetic refrigeration applications because of the large isothermal entropy change and the wide working temperature span. PACS number(s): 75.30.Sg, 75.30.Kz IntroductionRecently, room-temperature magnetic refrigeration based on the magnetocaloric effect (MCE) has emerged as a competitive technology to gas compress for it is energy efficient and also environmentally friendly. Up to date, there are several candidate materials for magnetic refrigeration and according to the nature of the magnetic transition, they fall into two categories: first-order magnetic transition (FOMT) materials and second-order magnetic

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Negative magnetocaloric effect at the antiferromagnetic to ferromagnetic transition of Mn3GaC

Cited by 195 publications

References 14 publications

Magnetovolume Effect and Negative Thermal Expansion in Mn<SUB>3</SUB>(Cu<SUB>1−<I>x</I></SUB>Ge<I><SUB>x</SUB></I>)N

Magnetovolume Effect and Negative Thermal Expansion in Mn<SUB>3</SUB>(Cu<SUB>1−<I>x</I></SUB>Ge<I><SUB>x</SUB></I>)N

Negative thermal expansion materials: technological key for control of thermal expansion

Wide temperature span of entropy change in first-order metamagnetic MnCo_1−xFe_xSi

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Negative magnetocaloric effect at the antiferromagnetic to ferromagnetic transition of Mn3GaC

Cited by 195 publications

References 14 publications

Magnetovolume Effect and Negative Thermal Expansion in Mn<SUB>3</SUB>(Cu<SUB>1&minus;<I>x</I></SUB>Ge<I><SUB>x</SUB></I>)N

Magnetovolume Effect and Negative Thermal Expansion in Mn<SUB>3</SUB>(Cu<SUB>1&minus;<I>x</I></SUB>Ge<I><SUB>x</SUB></I>)N

Negative thermal expansion materials: technological key for control of thermal expansion

Wide temperature span of entropy change in first-order metamagnetic MnCo1−xFexSi

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Magnetovolume Effect and Negative Thermal Expansion in Mn<SUB>3</SUB>(Cu<SUB>1−<I>x</I></SUB>Ge<I><SUB>x</SUB></I>)N

Magnetovolume Effect and Negative Thermal Expansion in Mn<SUB>3</SUB>(Cu<SUB>1−<I>x</I></SUB>Ge<I><SUB>x</SUB></I>)N

Wide temperature span of entropy change in first-order metamagnetic MnCo_1−xFe_xSi