Magnetic refrigerator for hydrogen liquefaction

Numazawa, Takenori; Kamiya, Kōji; Utaki, T.; Matsumoto, Koichí

doi:10.1016/j.cryogenics.2014.03.016

Cited by 147 publications

(67 citation statements)

References 4 publications

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“…In this context, several cryomagnetocaloric materials have been proposed [19][20][21][22][23][24][25][26][27][28]. Following this, Matsumoto et al [29,30] unveiled a reciprocating magnetic refrigerator dedicated to hydrogen liquefaction that uses the Dy 2.4 Gd 0.6 Al 5 O 12 garnet as refrigerant.…”

Section: Introductionmentioning

confidence: 99%

“…Especially, some of these systems show a strong coupling between magnetism and ferroelectricity which provides an additional degree of freedom regarding the design of magnetoelectric effect-based machines [30][31][32][33][34][35][36][37][38][39][40]. On the other hand, the investigation of their magnetocaloric properties has unveiled a great potential for application in magnetic refrigeration at low temperature regime [19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…For example, one of the major problems with these materials is that they experience decomposition due to hydrogen absorption [30]. In addition, the implementation of intermetallics as refrigerants in functional devices, favors the creation of an eddy current during the magnetization-demagnetization process, leading to undesirable thermal losses [43].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Review of the Magnetocaloric Effect in RMnO3 and RMn2O5 Multiferroic Crystals

et al. 2017

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Abstract:It is known that some of RMnO 3 and RMn 2 O 5 (R = rare earth) multiferroic crystals reveal a strong interplay between their magnetic and electric order parameters, paving the way for applications in spintronic technologies. Additionally, recent works have also pointed out their potential utilization as refrigerants in magnetocaloric cooling systems for cryogenic tasks. In this paper, recent advances regarding the magnetocaloric properties of both RMnO 3 and RMn 2 O 5 families of multiferroics are reviewed. With the aim of understanding the RMnO 3 and RMn 2 O 5 magnetocaloric features, their structural and magnetic properties are discussed. The physics behind the magnetocaloric effect as well as some of its key thermodynamic aspects are also considered.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Review of the Magnetocaloric Effect in RMnO3 and RMn2O5 Multiferroic Crystals

et al. 2017

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“…It reduces expenses and improves profitability for liquefying fuel gases before transportation. Matsumoto et al described a hydrogen liquefier based on the Dy 3 (Ga,Al) 5 O 12 garnet [11,12]. Therefore, magnetocaloric materials can be used as efficient refrigerants in the lowtemperature range with the aim of producing the liquefaction of He, H 2 , or natural gas [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Gd polarization on the large magnetocaloric effect ofGdCrO4in a broad temperature range

et al. 2016

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The ferromagnetic zircon-type phase of GdCrO 4 presents high values for the magnetocaloric (MC) parameters. This compound has large isothermal entropy changes S T under the magnetic field action in a wide temperature range, from 5 to 35 K, reaching a maximum | S T | = 29.0 ± 0.1 J/kg K at 22 K, for a field increment B = 9 T. It orders ferromagnetically at T C = 21.3 K via the Cr-Cr exchange interaction and shows a second transition at 4.8 K due to the ordering of the Gd sublattice. The large MC effect is enhanced by the polarization of the Gd 3+ ions by the Cr 5+ ones via a weaker Gd-Cr interaction. This effect is an interesting feature to be considered in the search for new compounds with a high MC effect in the range of liquid hydrogen or natural gas, regarding the liquefaction of gases by magnetization-demagnetization cycles. This paper contains experimental measurements of magnetization, heat capacity, and direct determinations of the MC effect. The magnetic contribution to the heat capacity C m has been obtained after subtracting the lattice component. Approximate values for the exchange constants J 1 (Cr-Cr) and J 3 (Gd-Cr) have been deduced from C m .

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“…Intermetallic compounds that contain rare-earth elements are particularly interesting because of their temperature-and pressure-dependent structural and physical transitions that make them potential candidates for magnetic applications [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds

et al. 2017

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Abstract:The structural, magnetic, and magnetocaloric properties of Er 6 Fe 23−x Al x (x = 0 and 3) intermetallic compounds have been studied systematically. Samples were prepared using the arc furnace by annealing at 1073 K for one week. Rietveld analysis of XRD shows the formation of pure crystalline phase with cubic Fm-3m structure. Refinement results show that the unit cell volume decreases with increasing Al content. The Curie temperature Tc of the prepared samples was found to be strongly dependent on the aluminum content. This reduces magnetization and the ferrimagnetic phase transition temperature (Tc) from 481 K (for x = 0) to 380 K (for x = 3), is due to the substitution of magnetic element (Fe) by non-magnetic atoms (Al). With the increase of the Al content, a decrease in the values of magnetic entropy is observed. The magnitude of the isothermal magnetic entropy (|∆SM|) at the Tc decreases from 1.8 J/kg·K for x = 0 to 0.58 J/kg·K for x = 3 for a field change 14 kOe. Respectively, the relative cooling power (RCP) decreases with increasing Al content reaching 42 Jkg −1 for x = 0 to 28 Jkg −1 for x = 3.

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Magnetic refrigerator for hydrogen liquefaction

Cited by 147 publications

References 4 publications

Review of the Magnetocaloric Effect in RMnO3 and RMn2O5 Multiferroic Crystals

Review of the Magnetocaloric Effect in RMnO3 and RMn2O5 Multiferroic Crystals

Effect of Gd polarization on the large magnetocaloric effect ofGdCrO4in a broad temperature range

Effect of Al Substitution on Structural, Magnetic, and Magnetocaloric Properties of Er6Fe23−xAlx (x = 0 and 3) Intermetallic Compounds

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