Magneto caloric effect in (DyxGd1$minus;x)3Ga5O12 for adiabatic demagnetization refrigeration

Numazawa, Takenori; Kamiya, Kōji; Okano, Takahiro; Matsumoto, Koichí

doi:10.1016/s0921-4526(02)02447-x

Cited by 45 publications

(46 citation statements)

References 3 publications

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“…[25] Therefore, here we compare the MCE for the garnets with substantial single-ion anisotropy (Ln = Tb, Dy, Ho) in a field of 2 T and the Gd based garnets in the experimentally limiting field of 9 T. The variation in Sm per mole Ln as a function of temperature for all the garnets is shown in Figure 7; the inset shows the variation of Sm per mole Ln as a function of magnetic field. Quantitative comparisons of the MCE with the parent gallium garnets using the values of Sm per mole are made in Table 7. For Ln = Gd, a 4-10% increase in Sm compared to GGG (14.12 J K -1 molGd -1 ) is observed on changing the A and X site ions except for Gd3Te2Li3O12, for which a decrease is seen.…”

Section: Magnetocaloric Effectmentioning

confidence: 99%

Sensitivity of magnetic properties to chemical pressure in lanthanide garnetsLn₃A₂X₃O₁₂,Ln = Gd, Tb, Dy, Ho,A = Ga, Sc, In, Te,X = Ga, Al, Li

Mukherjee

Hamilton

Glass

et al. 2017

J. Phys.: Condens. Matter

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A systematic study of the structural and magnetic properties of three-dimensionally frustrated lanthanide garnets Ln3A2X3O12, Ln = Gd, Tb, Dy, Ho, A = Ga, Sc, In, Te, X = Ga, Al, Li is presented. Garnets with Ln = Gd show magnetic behaviour consistent with isotropic Gd 3+ spins; no magnetic ordering is observed for T ≥ 0.4 K. Magnetic ordering features are seen for garnets with Ln = Tb, Dy, Ho in the temperature range 0.4 < T < 2.5 K, however the nature of the magnetic ordering varies for the different Ln as well as for different combinations of A and X. The changes in magnetic behaviour can be explained by tuning of the magnetic interactions and changes in the single-ion anisotropy. The change in magnetic entropy is evaluated from isothermal magnetisation measurements to characterise the magnetocaloric effect in these materials. Among the Gd garnets, the maximum change in magnetic entropy per mole (15.45 J K -1 molGd -1 ) is observed for Gd3Sc2Ga3O12 at 2 K, in a field of 9 T. The performance of Dy3Ga5O12 as a magnetocaloric material surpasses the other garnets with Ln = Tb, Dy, Ho.

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Section: Magnetocaloric Effectmentioning

confidence: 99%

Sensitivity of magnetic properties to chemical pressure in lanthanide garnetsLn₃A₂X₃O₁₂,Ln = Gd, Tb, Dy, Ho,A = Ga, Sc, In, Te,X = Ga, Al, Li

Mukherjee

Hamilton

Glass

et al. 2017

J. Phys.: Condens. Matter

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“…A different approach is to use ceramic materials which have geometrically frustrated magnetic lattices such as Dy 3 (TbGG). [22][23][24] DGG is a more efficient MCM than GGG at fields ≤2 T. [25] [25][26][27] and the nonmagnetic Ga 3+ site with Al 3+ or Fe 3+ partially or completely [28][29][30][31] have shown to have a measurable impact on the MCE. There is a lot of potential for further research on studying the effect of chemical substitution on the MCE in the different Ln 3 Ga 5 O 12 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Magnetocaloric Effect from Cr Substitution in Ising Lanthanide Gallium Garnets Ln₃CrGa₄O₁₂ (Ln = Tb, Dy, Ho)

Mukherjee

Dutton

2017

Adv Funct Materials

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A detailed study on the crystal structure and bulk magnetic properties of Cr substituted Ising type lanthanide gallium garnets Ln 3 CrGa 4 O 12 (Ln = Tb, Dy, Ho) is carried out using room temperature powder X-ray and neutron diffraction, magnetic susceptibility, isothermal magnetization, and heat capacity measurements. The magnetocaloric effect (MCE) where the geometry of the magnetic lattice prevents all the nearest-neighbor magnetic interactions from being satisfied simultaneously. [8] This suppresses or in some cases, completely inhibits magnetic longrange ordering. Geometrically frustrated magnets (GFMs) typically show ordering features at T 0 ∼ θ CW /10 where θ CW is the Curie-Weiss temperature, thereby suppressing the ordering temperature. [9] In complex lanthanide oxides, the highly localized 4f orbitals have weak magnetic interactions, i.e., θ CW is small and so when the magnetic lattice is frustrated, ordering is suppressed to even lower T. The theoretical magnetic entropy that can be extracted is much higher than in transition metal compounds. GFMs with Ln 3+ ions are therefore ideal candidates for sub 20 K magnetocaloric materials (MCMs). Another advantage is that the lanthanides are chemically very similar but their magnetic properties vary widely. This allows tuning of the properties for optimization of the MCE. [10][11][12] The lanthanide gallium garnets, Ln 3 Ga 5 O 12, are a family of materials, where the magnetic Ln 3+ spins form two interpenetrating networks of ten membered-rings of corner-sharing triangles leading to a high degree of geometrical frustration. [13] Of these, gadolinium gallium garnet (GGG), which shows no long-range ordering down to 25 mK, has been established as a MCM for magnetic refrigeration in the liquid helium temperature regime. The absence of long-range ordering, high density of magnetic ions, chemical stability, and lack of single ion anisotropy (L = 0 for Gd 3+ ) allowing for the full magnetic entropy) to be extracted in high magnetic fields makes it an ideal MCM for T < 20 K. [14][15][16] In recent years, a number of Gd containing MCMs with better performance at 2 K have been reported [17][18][19][20] but GGG continues to be used and serves as the benchmark for MCMs in this temperature regime. However, for all the Gd-based magnetocalorics, the change in magnetic entropy is maximized in fields of 5 T or higher. Such high magnetic fields can only be produced using a superconducting magnet which again requires cooling using cryogens. For more practical applications, we need to focus on developing materials with high MCE in fields ≤ 2 T, attainable by a permanent magnet. This has been discussed in a recent study on Tb(HCO 2 ) 3 where the MCE is significantly higher than Gd(HCO 2 ) 3 at higher temperatures and lower fields as the Tb 3+ have Ising-like spins contrasted with the Heisenberg nature of the Gd 3+ spins. [21] For Ln 3 Ga 5 O 12 , the MCE in fields ≤2 T is expected to be maximized for the Ln 3+ having Ising-like spins, Magnetic Materials

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“…Its entropy can be reasonably well described using the free ion model [11]. It was compared with experimental values [12,13] and is presented in Fig. 3.…”

Section: F Studied Solutionmentioning

confidence: 96%

Magnetic refrigeration down to 1.6 K for the future circular collidere+e−

Tkaczuk

Millet

Duval

et al. 2017

Phys. Rev. Accel. Beams

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High-field superconducting rf cavities of the future circular collider e þ e − may require a kW-range superfluid helium refrigeration down to 1.6 K. Magnetic refrigeration operating below 4.2 K can be an alternative to the compression/expansion helium refrigeration. A significant difference between this application and previous magnetic refrigerator studies is its large cooling power, up to 10 3 times larger than the other designs. Principles of magnetic refrigeration are described and various technical solutions are compared. A numerical model for the static magnetic refrigerator is presented, validated, and adapted to the needs of the positron-electron version of the future circular collider. A preliminary design of magnetic refrigerator suitable for low temperature, kW-range cooling is studied.

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Magneto caloric effect in (DyxGd1$minus;x)3Ga5O12 for adiabatic demagnetization refrigeration

Cited by 45 publications

References 3 publications

Sensitivity of magnetic properties to chemical pressure in lanthanide garnetsLn₃A₂X₃O₁₂,Ln = Gd, Tb, Dy, Ho,A = Ga, Sc, In, Te,X = Ga, Al, Li

Sensitivity of magnetic properties to chemical pressure in lanthanide garnetsLn₃A₂X₃O₁₂,Ln = Gd, Tb, Dy, Ho,A = Ga, Sc, In, Te,X = Ga, Al, Li

Enhanced Magnetocaloric Effect from Cr Substitution in Ising Lanthanide Gallium Garnets Ln₃CrGa₄O₁₂ (Ln = Tb, Dy, Ho)

Magnetic refrigeration down to 1.6 K for the future circular collidere+e−

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Magneto caloric effect in (DyxGd1$minus;x)3Ga5O12 for adiabatic demagnetization refrigeration

Cited by 45 publications

References 3 publications

Sensitivity of magnetic properties to chemical pressure in lanthanide garnetsLn3A2X3O12,Ln = Gd, Tb, Dy, Ho,A = Ga, Sc, In, Te,X = Ga, Al, Li

Sensitivity of magnetic properties to chemical pressure in lanthanide garnetsLn3A2X3O12,Ln = Gd, Tb, Dy, Ho,A = Ga, Sc, In, Te,X = Ga, Al, Li

Enhanced Magnetocaloric Effect from Cr Substitution in Ising Lanthanide Gallium Garnets Ln3CrGa4O12 (Ln = Tb, Dy, Ho)

Magnetic refrigeration down to 1.6 K for the future circular collidere+e−

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Sensitivity of magnetic properties to chemical pressure in lanthanide garnetsLn₃A₂X₃O₁₂,Ln = Gd, Tb, Dy, Ho,A = Ga, Sc, In, Te,X = Ga, Al, Li

Sensitivity of magnetic properties to chemical pressure in lanthanide garnetsLn₃A₂X₃O₁₂,Ln = Gd, Tb, Dy, Ho,A = Ga, Sc, In, Te,X = Ga, Al, Li

Enhanced Magnetocaloric Effect from Cr Substitution in Ising Lanthanide Gallium Garnets Ln₃CrGa₄O₁₂ (Ln = Tb, Dy, Ho)