From conventional to magnetic refrigerator technology

Sari, Osmann; Ballı, M.

doi:10.1016/j.ijrefrig.2013.09.027

Cited by 102 publications

(45 citation statements)

References 16 publications

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“…As can be seen in Figure 3c, TbMn 2 O 5 unveils a rotating entropy change that is about two times larger than that shown by HoMn 2 O 5 . Under a constant magnetic field of 2 T which is accessible via permanent magnets [34,35], ∆S R, max is found to be 6.36 J/kg K for TbMn 2 ∆S R where C p is the specific heat. C p values were taken from Reference [28].…”

Section: δSr Can Be Written As δSr = δS (H//easy-axis) − δS (H//hardamentioning

confidence: 99%

“…Functional magnetocaloric materials at room temperature have attracted worldwide interest over the last two decades due to their potential implementation as refrigerants in magnetic cooling systems [1][2][3][4][5][6][7][8][9][10][11][12][13]. However, the search for materials with excellent magnetocaloric properties in the temperature range from about 2 to 30 K is of great interest from fundamental, practical, and economical points of view, due to their potential use as refrigerants in several low temperature applications such as the space industry, scientific instruments, and gas liquefaction [14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Anisotropic Magnetocaloric Effect in RMn2O5 Single Crystals

et al. 2017

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Thanks to the strong magnetic anisotropy shown by the multiferroic RMn 2 O 5 (R = magnetic rare earth) compounds, a large adiabatic temperature change can be induced (around 10 K) by rotating them in constant magnetic fields instead of the standard magnetization-demagnetization method. Particularly, the TbMn 2 O 5 single crystal reveals a giant rotating magnetocaloric effect (RMCE) under relatively low constant magnetic fields reachable by permanent magnets. On the other hand, the nature of R 3+ ions strongly affects their RMCEs. For example, the maximum rotating adiabatic temperature change exhibited by TbMn 2 O 5 is more than five times larger than that presented by HoMn 2 O 5 in a constant magnetic field of 2 T. In this paper, we mainly focus on the physics behind the RMCE shown by RMn 2 O 5 multiferroics. We particularly demonstrate that the rare earth size could play a crucial role in determining the magnetic order, and accordingly, the rotating magnetocaloric properties of RMn 2 O 5 compounds through the modulation of exchange interactions via lattice distortions. This is a scenario that seems to be supported by Raman scattering measurements.

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Section: δSr Can Be Written As δSr = δS (H//easy-axis) − δS (H//hardamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the Anisotropic Magnetocaloric Effect in RMn2O5 Single Crystals

et al. 2017

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“…In this context, magnetocaloric materials have generated a worldwide interest due to their potential utilization as solid-state refrigerants in magnetic cooling devices [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Based on the well-known magnetocaloric effect (MCE), the magnetic refrigeration technique would enable the harmful synthetic refrigerants usually present in the conventional refrigerators to be completely phased out while offering a high thermodynamic efficiency [15][16][17]. The search for optimum magnetocaloric materials is then a key parameter in the development of magnetic cooling systems.…”

Section: Introductionmentioning

confidence: 99%

“…The search for optimum magnetocaloric materials is then a key parameter in the development of magnetic cooling systems. For room temperature tasks, rare-earth elements-based alloys [14] and particularly the gadolinium metal have been widely used as refrigerants and successfully implemented in functional devices [15][16][17]. However, their high cost and their poor resistance to corrosion and oxidation strictly limit their utilization in large scale applications of magnetocaloric refrigeration.…”

Section: Introductionmentioning

confidence: 99%

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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“…The main drawback of this technology is the necessity of a fluid with large temperature change and with good heat transfer properties, simultaneously 1 . These limitations reduce the available compounds to a small number of gases that are harmful to the environment.…”

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confidence: 99%

Hydrostatic pressure to trigger and assist magnetic transitions: Baromagnetic refrigeration

Quintero

Garbarino

Leyva

2014

Applied Physics Letters

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The possible application of the barocaloric effect to produce solid state refrigerators is a topic of interest in the field of applied physics. In this work, we present experimental data about the influence of external pressure on the magnetic properties of a manganite with phase separation. Using the Jahn Teller effect associated with the presence of the charge ordering we were able to follow the transition to the ferromagnetic state induced by pressure. We also demonstrated that external pressure can assist the ferromagnetic state, decreasing the magnetic field necessary to generate the magnetic transition.

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From conventional to magnetic refrigerator technology

Cited by 102 publications

References 16 publications

Analysis of the Anisotropic Magnetocaloric Effect in RMn2O5 Single Crystals

Analysis of the Anisotropic Magnetocaloric Effect in RMn2O5 Single Crystals

Review of the Magnetocaloric Effect in RMnO3 and RMn2O5 Multiferroic Crystals

Hydrostatic pressure to trigger and assist magnetic transitions: Baromagnetic refrigeration

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