8 results on '"Zhang, Yikun"'
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2. Glass forming ability, magnetic properties and cryogenic magnetocaloric effects in RE60Co20Al20 (RE = Ho, Er, Tm) amorphous ribbons.
- Author
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Zhang, Yikun, Zhu, Jian, Li, Shuo, Zhang, Bin, Wang, Yaming, Wang, Jiang, and Ren, Zhongming
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MAGNETOCALORIC effects , *MAGNETIC properties , *MAGNETIC transitions , *MAGNETIC cooling , *MAGNETIC entropy , *MANGANESE alloys , *AMORPHOUS alloys - Abstract
The rare-earths (RE) based amorphous materials with large magnetocaloric (MC) effects and excellent glass forming ability (GFA) have been recognized as promising candidates for magnetic refrigeration (MR). In this work, the RE 60 Co 20 Al 20 (RE = Ho, Er, Tm) amorphous ribbons were successfully fabricated and systematically determined with respect to the GFA, magnetic properties and MC effects. A second order magnetic phase transition (MPT) from ferromagnetic to paramagnetic (FM to PM) without noticeable field or thermal hysteresis has been observed around the Curie temperatures, T C ~ 22.3 K for Ho 60 Co 20 Al 20 , ~ 10.3 K for Er 60 Co 20 Al 20 , and ~ 5.0 K for Tm 60 Co 20 Al 20 , respectively. The MC parameters including the maximum magnetic entropy change (| Δ S M max |), temperature-averaged entropy change with 3 K lift [ TEC (3 K)], and relative cooling powder/refrigerant capacity (RCP/RC) have been determined to check the MC performances, and the corresponding values are determined to be 14.16, 15.57 and 15.06 J/kgK, to be14.04, 15.38 and 14.78 J/kgK, and to be 625.0/478.7, 505.7/391.8 and 334.0/243.4 J/kg for Ho 60 Co 20 Al 20 , Er 60 Co 20 Al 20 and Tm 60 Co 20 Al 20 under the field change Δμ 0 H = 5 T, respectively. The present results indicate that RE 60 Co 20 Al 20 (RE = Ho, Er, Tm) amorphous ribbons are considerable for cryogenic MR application. • The RE 60 Co 20 Al 20 (RE = Ho, Er, Tm) amorphous ribbons are fabricated. • The glass forming ability in RE 60 Co 20 Al 20 amorphous ribbons was investigated. • Large magnetocaloric effect in RE 60 Co 20 Al 20 has been observed. • RE 60 Co 20 Al 20 ribbons are considerable for cryogenic magnetic refrigeration. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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3. Structural, magnetic properties and magneto-caloric performances in the antiferromagnetic RECoSi2 (RE = Er and Tm) compounds.
- Author
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Guo, Dan, Zhang, Yikun, Wu, Bingbing, Wang, Yaming, and Ren, Zhongming
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MAGNETIC properties , *MAGNETOCALORIC effects , *MAGNETIC cooling , *MAGNETIC entropy , *RARE earth metals , *RIETVELD refinement , *ERBIUM , *MANGANESE alloys - Abstract
The ternary rare earth RE CoSi 2 (RE = Er and Tm) intermetallic compounds were synthesized by means of arc-melting technique and their crystal structure, magnetism and magneto-caloric effect (MCE) were studied systematically. Both ErCoSi 2 and TmCoSi 2 crystallize in a CeNiSi 2 -type structure (Cmcm space group) confirmed by FULLPROF Rietveld refinement. Magnetization data indicates the antiferromagnetic (AFM) ground state for both RE CoSi 2 compounds, and a magnetic field-induced ferromagnetic (FM) transition occurs below the Neel temperature T N ∼6.9 K for ErCoSi 2 and ∼5.4 K for TmCoSi 2. Considerable reversible MCE in ErCoSi 2 and TmCoSi 2 was observed. The MCE performances of RE CoSi 2 are evaluated by -Δ S M max (maximal magnetic entropy change), TEC (3) (temperature averaged entropy change), and RCP (relative cooling power) with the values of 7.1 J/kg K, 6.8 J/kg K and 165.9 J/kg for ErCoSi 2 , as well as 8.7 J/kg K, 8.5 J/kg K and 152.9 J/kg for TmCoSi 2 , respectively, under Δ H (field change) of 0–50 kOe. Image 1 • CeNiSi 2 -type RE CoSi 2 (RE = Er and Tm) compounds were fabricated. • AFM ordering at T N ∼6.9 K for ErCoSi 2 and ∼5.4 K for TmCoSi 2. • A field-induced AFM to FM transition for both compounds occur below T N. • Considerable values of -Δ S M max, TEC , RC and RCP were found. • RE CoSi 2 compounds are also considerable for cryogenic magnetic cooling. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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4. Structural, magnetic and magnetocaloric properties in RE2Ni1.5Ga2.5 (RE = Dy, Ho, Er and Tm) compounds.
- Author
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Guo, Dan, Zhang, Yikun, Wu, Bingbing, Wang, Haifeng, Guan, Renguo, Li, Xi, and Ren, Zhongming
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MAGNETIC properties , *MAGNETIC transitions , *MANGANESE alloys , *MAGNETIC cooling , *ERBIUM , *MAGNETIC entropy , *MAGNETIC structure - Abstract
The crystal structure together with the magnetic and magnetocaloric properties in RE 2 Ni 1.5 Ga 2.5 (RE = Dy, Ho, Er and Tm) have been investigated systematically. All the RE 2 Ni 1.5 Ga 2.5 compounds crystallize in a CaIn 2 -type structure of (P63/mmc space group). A second-ordered magnetic phase transition (SOPT) from ferromagnetic to paramagnetic (FM to PM) is occurred in RE 2 Ni 1.5 Ga 2.5 compounds with the Curie temperatures (T C) of approximately 16.1, 10.6, 4.1 and below 2 K for RE of Dy, Ho, Er and Tm, respectively. The magnetocaloric parameters including magnetic isothermal entropy change/temperature-averaged magnetic entropy change -Δ S M max/ TEC (5) and relative cooling power RCP are calculated with the values of 10.01/9.92 J/kg K and 418.6 J/kg for Dy 2 Ni 1.5 Ga 2.5 , 20.12/19.65 J/kg K and 644.1 J/kg for Ho 2 Ni 1.5 Ga 2.5 , 18.07/17.69 J/kg K and 447.1 J/kg for Er 2 Ni 1.5 Ga 2.5 , as well as 18.22/16.75 J/kg K and 330.7 J/kg for Tm 2 Ni 1.5 Ga 2.5 with magnetic field change (Δ H) of 0–7 T, respectively. Notably, Ho 2 Ni 1.5 Ga 2.5 exhibits ralatively high magnetocaloric parameters, which suggests that Ho 2 Ni 1.5 Ga 2.5 is a competitive candidate among the MCE materials in the field of cryogenic magnetic refrigeration (MR). • Magnetic properties and MCE in RE 2 Ni 1.5 Ga 2.5 compounds were studied. • Large values of -ΔS M max, TEC and RCP were observed at low temperature. • Ho 2 Ni 1.5 Ga 2.5 compound is competitive for cryogenic magnetic cooling. [ABSTRACT FROM AUTHOR]
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- 2020
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5. Magnetic properties and magneto-caloric performances in RECo2B2C (RE = Gd, Tb and Dy) compounds.
- Author
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Zhang, Yikun, Guo, Dan, Wu, Bingbing, Wang, Haifeng, Guan, Renguo, Li, Xi, and Ren, Zhongming
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MAGNETIC properties , *MANGANITE , *MAGNETIC cooling , *MAGNETIC entropy , *RARE earth metals , *MANGANESE alloys , *MAGNETIC fields , *CURIE temperature - Abstract
We present a detailed investigation of the crystal structure, magnetism and magneto-caloric performances of RE Co 2 B 2 C (RE = Gd, Tb and Dy) compounds. All compounds are described with a LuNi 2 B 2 C-type crystallographic structure (I 4/ mmm space group). A second-ordered paramagnetic to ferromagnetic (PM-FM) transition is observed in RE Co 2 B 2 C compounds around their Curie temperatures (T C) of 17.2, 5.3 and 7.7 K, and induced a considerable magneto-caloric effect (MCE) for GdCo 2 B 2 C, TbCo 2 B 2 C and DyCo 2 B 2 C, respectively. The magneto-caloric performances for RE Co 2 B 2 C were characterized by the isothermal magnetic entropy (- Δ S M max) , temperature averaged entropy change (TEC) with three different temperature lifts (3, 5 and 10 K), and relative cooling power (RCP). The corresponding values of - Δ S M max , TEC (3 K) and RCP under the magnetic field change (Δ H) of 0–5 T, are 10.34 J/kg-K, 10.23 J/kg-K, and 238.1 J/kg for GdCo 2 B 2 C, 18.09 J/kg-K, 17.83 J/kg-K, and 438.2 J/kg for TbCo 2 B 2 C, as well as 17.79 J/kg-K, 17.72 J/kg-K, and 480.1 J/kg for DyCo 2 B 2 C, respectively. • Magnetic properties and MCE in RE Co 2 B 2 C compounds were studied. • Large values of -ΔS M max, TEC, RC and RCP were observed at low temperature. • RE Co 2 B 2 C compounds are competitive for cryogenic magnetic cooling. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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6. Crystal structure, magnetic properties, and magnetocaloric effect in B-site disordered RE2CrMnO6 (RE = Ho and Er) perovskites.
- Author
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Wu, Bingbing, Guo, Dan, Wang, Yaming, and Zhang, Yikun
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MAGNETOCALORIC effects , *MAGNETIC properties , *CRYSTAL structure , *MANGANESE alloys , *MAGNETIC entropy , *MAGNETIC fields , *MAGNETIC cooling - Abstract
In this work, polycrystalline oxides viz., Ho 2 CrMnO 6 (HCMO) and Er 2 CrMnO 6 (ECMO), were prepared using the sol-gel process, and their crystal structure, magnetic properties, and magnetocaloric effects (MCEs) were studied. X-ray refinement results demonstrate that both oxides exhibited the B -site disordered perovskite type structure (Pbnm space group). A ferromagnetic-paramagnetic phase transition as well as large reversible MCEs was also observed at Curie temperatures (T C) of ~6.1 and ~5.2 K for HCMO and ECMO, respectively. For a magnetic field change (ΔH) of 0–7 T, the maximum magnetic entropy change (-Δ S M), temperature-averaged entropy change (TEC 3), and relative cooling power (RCP) were estimated to be 11.03 J/kgK, 11.02 J/kgK, and 322.7 J/kg for HCMO, and 12.94 J/kgK, 12.80 J/kgK and 277.5 J/kg for ECMO. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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7. Large conventional and inverse magnetocaloric effects in RE2Ga2Mg (RE = Tm, Er, Ho) compounds.
- Author
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Wang, Zhaoxing, Kai Reimann, Maximilian, Chen, Wang, Zhang, Yikun, and Pöttgen, Rainer
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MAGNETOCALORIC effects , *MAGNETIC entropy , *MAGNETIC cooling , *MAGNETICS , *MAGNETIC fields , *MAGNETIC properties , *MANGANESE alloys , *LIQUID nitrogen - Abstract
• The RE 2 Ga 2 Mg (RE = Tm, Er, Ho) compounds were fabricated. • The magnetic and magnetocaloric properties were investigated. • Large conventional and inverse magnetocaloric effects were observed. • The Tm 2 Ga 2 Mg is considerable for cryogenic magnetic cooling. The Mo 2 FeB 2 -type compounds RE 2 Ga 2 Mg (RE = Tm, Er, Ho) (space group P 4/ mbm) exhibit a large magnetocaloric (MC) effect which makes them promising for use in cryogenic magnetic cooling applications. They exhibit low temperature metamagnetic nature below their Néel temperatures of 6.8, 11.7 and 18.4 K for Tm 2 Ga 2 Mg, Er 2 Ga 2 Mg and Ho 2 Ga 2 Mg, respectively. The magnetic entropy change, the temperature-averaged entropy change (3 K-lift), and the relative cooling power under a magnetic field change of 0–7 T are 15.6, 15.4 J/kgK and 275.8 J/kg for Tm 2 Ga 2 Mg; 13.2, 13.0 J/kgK and 268.0 J/kg for Er 2 Ga 2 Mg; as well as 9.1, 9.0 J/kgK and 223.0 J/kg for Ho 2 Ga 2 Mg, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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8. Direct and inverse magnetocaloric effects in the antiferromagnetic rare earth (RE) rich RE6Ni2.25Al0.75 (RE = Dy, Ho and Er) compounds.
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Gu, Yuming, Wang, Xin, Li, Shuo, Ying, Jiayu, and Zhang, Yikun
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MAGNETOCALORIC effects , *RARE earth metals , *MAGNETIC cooling , *MAGNETIC transitions , *MAGNETIC entropy , *RARE earth metal alloys , *MANGANESE alloys - Abstract
The magnetic refrigeration (MR) by utilizing the magnetocaloric effect (MCE) of magnetic solids has been considered a promising, environmentally benign, energy-efficient cooling technology. However, the lack of promising magnetic substances has slowed the development of its active application. To identify suitable candidate materials, we herein identified the structural and magnetic properties together with the MCE and magnetocaloric performances of rare earth (RE) rich RE 6 Ni 2.25 Al 0.75 (RE = Dy, Ho and Er) compounds. All the RE 6 Ni 2.25 Al 0.75 compounds are confirmed to crystallized in orthogonal Ho 6 Co 2 Ga-type structure and underwent paramagnetic to antiferromagnetic magnetic transitions. Moreover, large direct (conventional) and inverse MCEs have been observed in all the RE 6 Ni 2.25 Al 0.75 compounds. The values of peak magnetic entropy changes, temperature-averaged magnetic entropy changes with 5 K-lift and relative cooling powers under magnetic field change of 0–7 T are evaluated to be − 4.44 J/kg-K, − 4.38 J/kg-K and 230.6 J/kg for Dy 6 Ni 2.25 Al 0.75 , to be − 12.68 J/kg-K, − 12.26 J/kg-K and 378.2 J/kg for Ho 6 Ni 2.25 Al 0.75 , and to be − 17.52 J/kg-K, − 17.33 J/kg-K and 465.7 J/kg for Er 6 Ni 2.25 Al 0.75 , respectively. • The RE6Ni2.25Al0.75 (RE = Dy, Ho and Er) compounds are fabricated. • The structural and magnetic properties were investigated. • Large direct and inverse magnetocaloric effects were observed. • The Er6Ni2.25Al0.75 is considerable for cryogenic magnetic refrigeration. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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