Magnetocaloric effect in the Laves-phase<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>Ho</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Dy</mml:mi></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mi>Al</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math>family in high magnetic fields

Bykov, Eduard; Liu, Wei; Skokov, Konstantin; Scheibel, Franziska; Gutfleisch, Oliver; Taskaev, S.; Khovaylo, Vladimir; Plakhotskiy, D.; Mejía, C. Salazar; Wosnitza, J.; Gottschall, Tino

doi:10.1103/physrevmaterials.5.095405

Cited by 13 publications

(8 citation statements)

References 53 publications

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“…The setup for direct pulse-field measurements of ∆T ad is shown in Figure 17b. The experimental methods related to the pulsed high magnetic fields have been applied for several MCMs such as Ho 2 Fe 17 , [443] rare earthbased Laves phase compounds, [90,444,445] Gd, [446,447] MnFe 4 Si 3 , [448] FeRh, [449] (Mn,Fe) 2 (P,Si), [450] MnCoSi, [451] La(Fe, Si) 13 , [452] and NiMn-based Heusler compounds. [441,442,[453][454][455] Technical details and advances about the pulsed high magnetic fields on different MCMs have recently been reviewed.…”

Section: High Magnetic Pulse Fieldsmentioning

confidence: 99%

Advanced Magnetocaloric Materials for Energy Conversion: Recent Progress, Opportunities, and Perspective

Zhang,

Miao,

van Dijk

et al. 2024

Advanced Energy Materials

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Solid‐state caloric effects as intrinsic thermal responses to different physical external stimuli (magnetic‐, uniaxial stress‐, pressure‐, and electric‐fields) can achieve a higher energy efficiency compared with traditional gas compression techniques. Among these effects, magnetocaloric energy conversion is regarded as the best available alternative and has been exploited extensively for promising application scenarios in the last decades. This review systematically introduces the magnetocaloric effect and its applications, and summarizes the corresponding representative magnetocaloric materials, as well as important progress in recent years. Specifically, the review focuses on some key understandings of the magnetocaloric effect by utilizing state‐of‐the‐art technical tools such as synchrotron X‐ray, neutron scattering, muon spin spectroscopy, positron annihilation spectroscopy, high magnetic fields, etc., and highlights their importance toward advanced materials design and development. An overview of the basic principles and applications of these advanced techniques on magnetocaloric materials is provided. Finally, the challenges and perspectives on further developments in this field are discussed. Further in‐depth understanding and manufacturing technology advancement combined with fast‐developed artificial intelligence and machine learning are expected to advance the magnetocaloric energy conversion technology closer to real applications.

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Section: High Magnetic Pulse Fieldsmentioning

confidence: 99%

Advanced Magnetocaloric Materials for Energy Conversion: Recent Progress, Opportunities, and Perspective

Zhang,

Miao,

van Dijk

et al. 2024

Advanced Energy Materials

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“…This is, for instance, the case for a magnetic transition between a para-and a ferromagnetic phase around the Curie temperature T C . Some example materials studied in pulsed magnetic fields, are the rare-earth element Gd [50], Laves phases [51], Mn 5 Ge 3 [52], and GdNi 2 [53]. We discuss the case of Gd and the Laves-phase compound HoAl 2 in detail below.…”

Section: Materials With Second-order Phase Transitionmentioning

confidence: 99%

“…The second example covers a completely different temperature range as in the previous example. Laves phases are promising materials for gas liquefaction based on the MCE [51,[55][56][57]. Therefore, measurements down to low temperatures are necessary to study these materials.…”

Section: Laves Phasesmentioning

confidence: 99%

“…In some cases, the use of type-E thermocouples is needed to gain sensitivity as mentioned in the experimental section. Our example, HoAl 2 , undergoes a second-order phase transition at T C = 29 K [51]. We characterized the MCE in this material in pulsed magnetic fields up to 50 T in a temperature range between 20 and 120 K. Figure 12 presents the maximum ∆T ad as a function of initial temperature for different magnetic-field changes.…”

Section: Laves Phasesmentioning

confidence: 99%

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On the high-field characterization of magnetocaloric materials using pulsed magnetic fields

Salazar Mejía,

Niehoff,

Straßheim

et al. 2023

J. Phys. Energy

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Magnetic refrigeration is a highly active field of research. The recent studies in materials and methods for hydrogen liquefaction and innovative techniques based on multicaloric materials have significantly expanded the scope of the field. For this reason, the proper characterization of materials is now more crucial than ever. This makes it necessary to determine the magnetocaloric and other physical properties under various stimuli such as magnetic fields and mechanical loads. In this work, we present an overview of the characterization techniques established at the Dresden High Magnetic Field Laboratory in recent years, which specializes in using pulsed magnetic fields. The short duration of magnetic-field pulses, lasting only some ten milliseconds, simplifies the process of ensuring adiabatic conditions for the determination of temperature changes, ∆Tad. The possibility to measure in the temperature range from 10 to 400 K allows us to study magnetocaloric materials for both room-temperature applications and gas liquefaction. With magnetic-field strengths of up to 50 T, almost every first-order material can be transformed completely. The high field-change rates allow us to observe dynamic effects of phase transitions driven by nucleation and growth as well. We discuss the experimental challenges and advantages of the investigation method using pulsed magnetic fields. We summarize examples for some of the most important material classes including Gd, Laves phases, La-Fe-Si, Mn-Fe-P-Si, Heusler alloys and Fe-Rh. Further, we present the recent developments in simultaneous measurements of temperature change, strain, and magnetization, and introduce a technique to characterize multicaloric materials under applied magnetic field and uniaxial load. We conclude by demonstrating how the use of pulsed fields opens the door to new magnetic-refrigeration principles based on multicalorics and the “exploiting-hysteresis” approach.

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“…If about one-third of H 2 needs to be transported and stored in its liquid state, one would require about 13 000 small-scale liquefaction plants with a production capacity of 5 tons per day. Providing a potential hydrogen liquefier using magnetocaloric material HoAl 2 as the refrigerant for the final cooling state operating at 20 K at a frequency of 1 Hz in fields of 7 T, about 1 ton of holmium would be needed [52]. This means a total of 13 000 tons for the EU alone, and the total holmium production is a measly 10 tons per year [53].…”

Section: Introductionmentioning

confidence: 99%

Designing magnetocaloric materials for hydrogen liquefaction with light rare-earth Laves phases

et al. 2023

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Magnetocaloric hydrogen liquefaction could be a “game-changer” for liquid hydrogen industry. Although heavy rare-earth based magnetocaloric materials show strong magnetocaloric effects in the temperature range required by hydrogen liquefaction (77 ~ 20 K), the high resource criticality of the heavy rare-earth elements is a major obstacle for upscaling this emerging liquefaction technology. In contrast, the higher abundances of the light rare-earth elements make their alloys highly appealing for magnetocaloric hydrogen liquefaction. Via a mean-field approach, it is demonstrated that tuning the Curie temperature (TC) of an idealized light rare-earth based magnetocaloric material towards lower cryogenic temperatures leads to larger maximum magnetic and adiabatic temperature changes (ΔST and ΔTad). Especially in the vicinity of the condensation point of hydrogen (20 K), ΔST and ΔTad of the optimized light rare-earth based material are predicted to show significantly large values. Following the mean-field approach and taking the chemical and physical similarities of the light rare-earth elements into consideration, a method of designing light rare-earth intermetallic compounds for hydrogen liquefaction is used: tunning TC of a rare-earth alloy to approach 20 K by mixing light rare-earth elements with different de Gennes factors. By mixing Nd and Pr in Laves phase (Nd,Pr)Al2, and Pr and Ce in Laves phase (Pr, Ce)Al2, a fully light rare-earth intermetallic series with large magnetocaloric effects covering the temperature range required by hydrogen liquefaction is developed, demonstrating a competitive maximum effect compared to the heavy rare-earth compound DyAl2.

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Magnetocaloric effect in the Laves-phaseHo1−xDyxAl2family in high magnetic fields

Cited by 13 publications

References 53 publications

Advanced Magnetocaloric Materials for Energy Conversion: Recent Progress, Opportunities, and Perspective

Advanced Magnetocaloric Materials for Energy Conversion: Recent Progress, Opportunities, and Perspective

On the high-field characterization of magnetocaloric materials using pulsed magnetic fields

Designing magnetocaloric materials for hydrogen liquefaction with light rare-earth Laves phases

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