Magnetocaloric Effect and Transition Order in HoAl

Baran, S.; Duraj, R.; Szytuła, A.

doi:10.12693/aphyspola.127.815

Cited by 7 publications

(7 citation statements)

References 13 publications

(11 reference statements)

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“…All peaks were sharp and well indexed to the Fd-3m space group without detecting impurity phases. The lattice parameters were deduced to be a = 0.7838 nm, which was consistent with the previous report [25]. The back-scattered Laue photos of the crystal along the axes [100], [110], and [111] after polishing are presented in Figure 2b-d, respectively, with sharp and clear spots from the bulk crystal.…”

Section: Growth Of Hoal 2 Crystalssupporting

confidence: 89%

Single-Crystal Growth of a Cubic Laves-Phase Ferromagnet HoAl2 by a Laser Floating-Zone Method

et al. 2023

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The successful growth of single crystals of a cubic Laves-phase material HoAl2 with the space group Fd-3m is reported in this study. The crystals were grown by a floating-zone method with five laser diodes as a heat source. Al-rich feed rods were prepared as compensation for heavy evaporation during the growth. The nominal ratio for the feed rods was optimized as Ho:Al = 1:2.5. Single crystals of HoAl2 with a length of 50 mm were first grown in this technique. Obtaining the large-sized crystal by the floating-zone method enabled us to systematically explore the physical properties using the same batch crystal. The crystal possessed a second-ordered ferromagnetic transition at 29 K and a first-ordered spin-reorientation transition at 20 K. The bulk physical properties, such as specific heat, magnetic susceptibility, isothermal magnetization, and thermal expansion measurements, were measured. Additionally, a magnetocaloric effect was evaluated by the magnetic entropy change. We demonstrate that anisotropic physical properties along the principal axes ([100], [110], and [111]) emerged below the magnetically ordered states, in contrast to the isotropic behavior in the paramagnetic state.

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Section: Growth Of Hoal 2 Crystalssupporting

confidence: 89%

Single-Crystal Growth of a Cubic Laves-Phase Ferromagnet HoAl2 by a Laser Floating-Zone Method

et al. 2023

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“…Hence, the maximum −Δ S M value in gravimetric units for Δ H = 8 T increases from 4.5 ( T = 20 K) up to 6.2 J kg –1 K –1 ( T = 10 K), and then it further decreases to 3.8 J kg –1 K –1 ( T = 2 K). These values are higher than those found for GdW 10 and GdW 30 (−Δ S M = 1.9 and 4.7 J kg –1 K –1 at T = 1.3 and 1.8 K, respectively, for Δ H = 7 T), comparing well with those of metallic holmium and related intermetallic alloys (HoB 2 and HoAl 2 ), recently proposed as cryomagnetic coolants just above the hydrogen liquefaction temperature. − …”

mentioning

confidence: 45%

“…These values are higher than those found for GdW 10 and GdW 30 (−Δ S M = 1.9 and 4.7 J kg –1 K –1 at T = 1.3 and 1.8 K, respectively, for Δ H = 7 T), 9 comparing well with those of metallic holmium and related intermetallic alloys (HoB 2 and HoAl 2 ), recently proposed as cryomagnetic coolants just above the hydrogen liquefaction temperature. 33 − 35 …”

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confidence: 99%

Holmium(III) Single-Ion Magnet for Cryomagnetic Refrigeration Based on an MRI Contrast Agent Derivative

et al. 2021

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The coexistence of field-induced blockage of the magnetization and significant magnetocaloric effects in the low-temperature region occurs in a mononuclear holmium(III) diethylenetriamine- N , N , N ′, N ″, N ″-pentaacetate complex, whose gadolinium(III) analogue is a commercial MRI contrast agent. Both properties make it a suitable candidate for cryogenic magnetic refrigeration, thus enlarging the variety of applications of this simple class of multifunctional molecular nanomagnets.

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“…For comparison between the present results and those for a typical magnetocaloric material, the efficiency for ferromagnetic HoAl 2 is also shown in the inset. The data for HoAl 2 were taken from a previous paper 31 . …”

Section: Resultsmentioning

confidence: 99%

High-efficiency magnetic refrigeration using holmium

Terada

Mamiya

2021

Nat Commun

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Magnetic refrigeration (MR) is a method of cooling matter using a magnetic field. Traditionally, it has been studied for use in refrigeration near room temperature; however, recently MR research has also focused on a target temperature as low as 20 K for hydrogen liquefaction. Most research to date has employed high magnetic fields (at least 5 T) to obtain a large entropy change, which requires a superconducting magnet and, therefore, incurs a large energy cost. Here we propose an alternative highly efficient cooling technique in which small magnetic field changes, Δμ0H ≤ 0.4 T, can obtain a cooling efficiency of −ΔSM/Δμ0H = 32 J kg−1K−1T−1, which is one order of magnitude higher than what has been achieved using typical magnetocaloric materials. Our method uses holmium, which exhibits a steep magnetization change with varying temperature and magnetic field. The proposed technique can be implemented using permanent magnets, making it a suitable alternative to conventional gas compression–based cooling for hydrogen liquefaction.

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Magnetocaloric Effect and Transition Order in HoAl

Cited by 7 publications

References 13 publications

Single-Crystal Growth of a Cubic Laves-Phase Ferromagnet HoAl2 by a Laser Floating-Zone Method

Single-Crystal Growth of a Cubic Laves-Phase Ferromagnet HoAl2 by a Laser Floating-Zone Method

Holmium(III) Single-Ion Magnet for Cryomagnetic Refrigeration Based on an MRI Contrast Agent Derivative

High-efficiency magnetic refrigeration using holmium

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