Magnetic properties and magnetocaloric effects of RNiSi2 (R= Gd, Dy, Ho, Er, Tm) compounds

Zhang, B.; Zheng, Xinliang; Zhang, Y.; Zhao, Xin; Xiong, Jin; Zuo, Shulan; Liu, D.; Zhao, Tongyun; Hu, Fengxia; Shen, Baogen

doi:10.1063/1.5007018

Cited by 4 publications

(4 citation statements)

References 39 publications

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“…Moreover, we illustrate the excellent magnetocaloric performance of a hypothetical HoNi-Ga 2 and ErNiGa 2 composite which would exhibit a notable tablelike MCE in a broad temperature range around the desired H 2 liquefaction temperature (8.7 J kg −1 K −1 around 11-25 K). [34,41,44,48,49] and some recently reported cryogenic materials [59][60][61] for 0-5 T. The color legend on the right indicates the different T t for each sample.…”

Section: Discussionmentioning

confidence: 99%

“…This is due to the large total orbital quantum numbers (J) of HRE elements, which lead to large magnetic moments that are beneficial to the magnetocaloric properties. Recently, ternary intermetallic compounds, HRE-TM-X (X = p-block elements) with the stoichiometric ratio of 1:1:2, have received extensive attention for their diverse crystal structure and unique magnetic properties [34][35][36][37][38][39][40][41][42][43][44][45][46][47]. Their magnetic phase transition and magnetocaloric properties can be varied depending on the TM and p-block elements.…”

Section: Introductionmentioning

confidence: 99%

“…For TM = Ni and X = Al, the samples crystallize in the orthorhombic MgCuAl 2 -type structure, presenting ferromagnetic (FM) order at low temperatures (Curie temperature (T C ) ranges around 2.4-28.0 K) [39][40][41]. For X = Si, the compounds crystallize in the CeNiSi 2 -type structure, revealing antiferromagnetic order at low temperatures (Néel temperature ranges around 3.0-25.0 K) [44]. When X = Ga, depending on the RE element, two different types of crystal structures have been reported [46]: NdNiGa 2 -type for RE = La-Nd, Sm or Gd and MgCuAl 2 -type for RE = Y or Tb-Lu.…”

Section: Introductionmentioning

confidence: 99%

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Excellent cryogenic magnetocaloric properties in heavy rare-earth based HRENiGa2 (HRE = Dy, Ho, or Er) compounds

et al. 2022

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RENiX2 compounds, where RE = rare-earth element and X = p-block element, have been highly regarded for cryogenic magnetocaloric applications. Depending on the elements, they can crystallize in CeNiSi2-type, NdNiGa2-type, or MgCuAl2-type crystal structures, showing different types of magnetic ordering and thus affect their magnetic properties. Regarding the magnetocaloric effect, MgCuAl2-type aluminides show larger values than those of the CeNiSi2-type silicides and the NdNiGa2-type gallides due to the favored ferromagnetic ground state. However, RENiGa2 gallides can crystallize in either NdNiGa2- or MgCuAl2-type structures depending on the RE element. In this work, we select heavy RE (HRE) elements for exploring the microstructure, magnetic ordering and magnetocaloric performance of HRENiGa2 (HRE = Dy, Ho or Er) gallides. They all crystallize in the desired MgCuAl2-type crystal structure which undergoes a second-order transition from ferro- to para-magnetic state with increasing temperature. The maximum isothermal entropy change (∣∆Sisomax∣) values are 6.2, 10.4, and 11.4 J kg−1 K−1 (0–5 T) for DyNiGa2, HoNiGa2, and ErNiGa2, respectively, which are comparable to many recently reported cryogenic magnetocaloric materials. Particularly, the excellent magnetocaloric properties of HoNiGa2 and ErNiGa2 compounds, including their composite, fall in the temperature range that enables them for the in-demand hydrogen liquefaction systems.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Excellent cryogenic magnetocaloric properties in heavy rare-earth based HRENiGa2 (HRE = Dy, Ho, or Er) compounds

et al. 2022

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“…This property is found in a few rare earth based alloys, such as DyNiSi and HoFeSi. [20,21] The maximal positive ∆S M reaches 13.1 J/kg•K for a field change −2 T. It is beneficial to practical application, because the magnetic field of 2 T can be provided by a permanent magnet. The maximal negative ∆S M reaches 18.0 J/kg•K for the field change 0 T-5 T. From the above analysis, single crystals outperform polycrystals, but polycrystals also show objective magnetocaloric properties.…”

Section: -2mentioning

confidence: 99%

Large inverse and normal magnetocaloric effects in HoBi compound with nonhysteretic first-order phase transition

Y¹,

G²,

Wang³

et al. 2022

Chinese Phys. B

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HoBi single crystal and polycrystalline compounds with NaCl-type structure were successfully obtained, and their magnetic and magnetocaloric properties were studied in detail. With temperature increasing, HoBi compound undergoes two magnetic transitions at 3.7 K and 6 K, respectively. The transition temperature at 6 K has been recognized as an antiferromagnetic to paramagnetic (AFM-PM) transition, which belonged to first-order magnetic phase transition (FOMT). It is interesting that HoBi compound with FOMT exhibits good thermal and magnetic reversibility. What’s more, a large inverse and normal magnetocaloric effects (MCE) were found in HoBi single crystal on the H // [100] direction, and the positive ΔS M peaks reaches 13.1 J/kg K under a low field change of 2 T and the negative ΔS M peaks reaches -18 J/kg K under a field change of 5 T, respectively. These excellent properties are expected to be applied in some magnetic refrigerators with special designs and functions.

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First- and second-order phase transitions in RE6Co2Ga (RE = Ho, Dy or Gd) cryogenic magnetocaloric materials

et al. 2021

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Rare-earth (RE) rich intermetallics crystallizing in orthorhombic Ho6Co2Ga-type crystal structure exhibit peculiar magnetic properties that are not widely reported for their magnetic ordering, order of magnetic phase transition, and related magnetocaloric behavior. By tuning the type of RE element in RE6Co2Ga (RE = Ho, Dy or Gd) compounds, metamagnetic anti-to-paramagnetic (AF to PM) phase transitions could be tuned to ferro-to-paramagnetic (FM to PM) phase transitions. Furthermore, the FM ground state for Gd6Co2Ga is confirmed by density functional theory calculations in addition to experimental observations. The field dependence magnetocaloric and Banerjee’s criteria demonstrate that Ho6Co2Ga and Dy6Co2Ga undergo a first-order phase transition in addition to a second-order phase transition, whereas only the latter is observed for Gd6Co2Ga. The two extreme alloys of the series, Ho6Co2Ga and Gd6Co2Ga, show maximum isothermal entropy change (∣ΔS iso max (5 T)∣) of 10.1 and 9.1 J kg−1K−1 at 26 and 75 K, close to H2 and N2 liquefaction, respectively. This outstanding magnetocaloric effect performance makes the RE6Co2Ga series of potential for cryogenic magnetic refrigeration applications.

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Magnetic properties and magnetocaloric effects of RNiSi2 (R= Gd, Dy, Ho, Er, Tm) compounds

Cited by 4 publications

References 39 publications

Excellent cryogenic magnetocaloric properties in heavy rare-earth based HRENiGa2 (HRE = Dy, Ho, or Er) compounds

Excellent cryogenic magnetocaloric properties in heavy rare-earth based HRENiGa2 (HRE = Dy, Ho, or Er) compounds

Large inverse and normal magnetocaloric effects in HoBi compound with nonhysteretic first-order phase transition

First- and second-order phase transitions in RE6Co2Ga (RE = Ho, Dy or Gd) cryogenic magnetocaloric materials

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