10 results on '"Zhang, Yikun"'
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2. Magnetic Properties and Magnetocaloric Effect in Tb2FeCrO6 Double Perovskite Oxide.
- Author
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Huang, Silu, Lin, Junli, Shu, Yongyun, and Zhang, Yikun
- Subjects
MAGNETIC entropy ,MAGNETOCALORIC effects ,MAGNETIC properties ,TERBIUM ,PEROVSKITE ,MAGNETICS ,OXIDES - Abstract
In this work, we fabricated a polycrystalline Tb
2 FeCrO6 double perovskite (DP) oxide by a solid-state reaction method and determined its structural, magnetic, and magnetocaloric (MC) properties. The Tb2 FeCrO6 DP oxide was found to crystallize in a DP-type structure with the Pbnm space group and to undergo a paramagnetic-to-antiferromagnetic transition at a temperature of ~ 8.5 K. A large low-temperature MC effect was observed in the Tb2 FeCrO6 DP oxide. The MC parameters in terms of maximum magnetic entropy changes, temperature-averaged entropy change (5 K), and relative cooling power for Tb2 FeCrO6 DP oxide under a magnetic field change of 0–7 T were 12.9 J/kg K, 12.7 J/kg K, and 341.4 J/kg, respectively. These parameters were consistent with similarly high levels in recently updated MC materials, making the material a suitable candidate for low-temperature magnetic cooling applications. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
3. Rare‐Earth‐Free Mn30Fe20−xCuxAl50 Magnetocaloric Materials with Stable Cubic CsCl‐Type Structure for Room‐Temperature Refrigeration.
- Author
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Zhang, Yikun, Hao, Weixiang, Hu, Chenglong, Wang, Xing, Zhang, Xuefeng, and Li, Lingwei
- Subjects
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MAGNETIC cooling , *MAGNETIC transitions , *MAGNETIC materials , *MAGNETOCALORIC effects , *MAGNETICS - Abstract
Magnetic refrigeration technology based on the magnetocaloric effect (MCE) of magnetic substances has been considered a prominent, energy‐efficient, and environmentally benign cooling method. Exploring suitable magnetic substances is a prerequisite for practical applications. A family of rare‐earth‐free magnetocaloric materials called Mn30Fe20−xCuxAl50 alloys is identified room‐temperature refrigeration, which are derived from the well‐known MnAl‐based permanent magnets. As expected from experimental and theoretical investigations, all of the Mn30Fe20−xCuxAl50 alloys are crystallized in a stable cubic CsCl‐type crystal structure, revealing a single second‐order type magnetic phase transition (MPT) with tunable MPT temperature. They also exhibit a large reversible MCE and good magnetocaloric performances in a wide temperature range. Crucially, these Mn30Fe20−xCuxAl50 alloys represent a rare case of magnetic materials belonging to a large family that can be fabricated from low‐price, earth‐abundant, and non‐toxic elements. They could provide new choices for practical room‐temperature magnetic refrigeration applications. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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4. Exploration of the rare-earth cobalt nickel-based magnetocaloric materials for hydrogen liquefaction.
- Author
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Zhang, Yikun, Ying, Jiayu, Gao, Xinqiang, Mo, Zhaojun, Shen, Jun, and Li, Lingwei
- Subjects
MAGNETIC transitions ,MAGNETIC cooling ,MAGNETOCALORIC effects ,MAGNETIC traps ,MAGNETICS ,RARE earth metals ,RARE earth metal alloys - Abstract
• The Dy 1- x Ho x CoNi and Ho 1- x Er x CoNi compounds were fabricated. • The structural, magnetic and magnetocaloric properties were studied. • These compounds have high potential for hydrogen liquefaction. Magnetic refrigeration based on the magnetocaloric effect (MCE) of magnetic solids has been considered as an emerging technology for hydrogen liquefaction. However, the lack of high-performance materials has slowed the development of any practical applications. Here, we present a family of rare-earth cobalt nickel-based magnetocaloric materials, namely Dy 1- x Ho x CoNi and Ho 1- x Er x CoNi compounds, and systematically investigated their structural and magnetic properties as well as the MCE and magnetocaloric performance. All of these compounds crystallize in the C15-type Laves-phase structure and undergo typical second-order magnetic phase transition (MPT). The change in magnetism and the MPT temperature for the Dy 1- x Ho x CoNi and Ho 1- x Er x CoNi compounds originate from the exchange interactions between nearest-neighbor RE
3+ ion pairs. No hysteresis magnetocaloric effect was achieved, and the MPT temperature of these compounds could be tuned from the liquefaction temperature of nitrogen (∼77 K) to hydrogen (∼20 K) by adjusting the ratio of rare-earth elements. This study's findings indicate that the Dy 1- x Ho x CoNi and Ho 1- x Er x CoNi compounds are of potential for practical magnetic refrigeration applications in the field of hydrogen liquefaction. [Display omitted] [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
5. Structural, magnetic and magnetocaloric properties of the rare earth (RE) molybdate RE2MoO6 (RE = Dy, Tb and Gd) oxides.
- Author
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Zhang, Yikun, He, Ningzhou, Zhang, Zhenqian, and Wang, Xin
- Subjects
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TERBIUM , *MANGANITE , *RARE earth oxides , *MAGNETIC properties , *MAGNETIC transitions , *MAGNETIC cooling , *MAGNETIC entropy - Abstract
Reported here is a systematical investigation on the crystal structure, magnetic properties and magnetocaloric (MC) effect of three rare earth (RE) molybdate RE 2 MoO 6 (RE = Dy, Tb and Gd) oxides. The X-ray powder diffraction and the morphology as examined using the scanning electron microscope indicate phase-pure and polycrystalline nature of these oxides. The temperature (2–100 K) and magnetic field (up to 5 T) dependence of the magnetic measurements determine the magnetic phase transition (MPT) and MC properties. All the present RE 2 MoO 6 oxides crystallize in a monoclinic structure belonging to C 2/ c space group with the antiferromagnetic ordering at low temperature. Moreover, the RE 2 MoO 6 oxides hold reasonable values of MC parameters including the maximum isothermal magnetic entropy change/temperature-averaged entropy change (2 K lift) and relative cooling power values have been evaluated with the magnetic change of 0–5 T, yielding 17.22 (17.08) J/kgK and 277.67 J/kg for Dy 2 MoO 6 , 17.03 (16.83) J/kgK and 261.12 J/kg for Tb 2 MoO 6 , as well as 27.68 (26.69) J/kgK and 228.14 J/kg for Gd 2 MoO 6 , respectively. These acceptable MC parameters make the present RE 2 MoO 6 oxides potential candidates for cryogenic magnetic refrigeration (MR). [ABSTRACT FROM AUTHOR]
- Published
- 2022
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6. Review of the structural, magnetic and magnetocaloric properties in ternary rare earth RE2T2X type intermetallic compounds.
- Author
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Zhang, Yikun
- Subjects
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MAGNETIC properties , *MAGNETIC transitions , *MAGNETIC cooling , *MAGNETIC fields , *MAGNETOCALORIC effects , *INTERMETALLIC compounds , *RARE earth metals - Abstract
Abstract It is well known that rare earth (RE) based intermetallic compounds reveal various interesting magnetic properties depending on the crystallized structures and the constituent elements, paving the way for potential applications in different fields. Recent progresses regarding magnetic properties and magnetocaloric effect (MCE) in ternary rare earth RE 2 T 2 X (RE = Gd-Tm; T = Cu, Ni, Co; and X = Cd, In, Ga, Sn, Al) intermetallic compounds are reviewed in this paper. Some of them exhibit excellent MCE performances which make them attractive in the field of magnetic refrigeration at low temperature. With the aim of understanding the magnetocaloric characteristics of RE 2 T 2 X compounds, the crystal structure, magnetism and magnetic phase transition are also focused. The origin of the MCE together with the physics behind and the potential application of RE 2 T 2 X compounds are thoroughly considered. Highlights • Magnetic and magnetocaloric properties in RE 2 T2X compounds are reviewed. • The RE 2 T2X compounds show four types of crystallize structures. • Some of them exhibit excellent cryogenic magnetocaloric performances. • The origin of magnetocaloric effect in RE 2 T2X compounds is discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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7. Reversible Table-Like Magnetocaloric Effect in EuAuGe Compound.
- Author
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Zhang, Yikun and Wilde, Gerhard
- Subjects
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MAGNETOCALORIC effects , *MAGNETIC transitions , *INTERMETALLIC compounds , *MAGNETIC entropy , *MAGNETIC cooling , *MAGNETIC properties - Abstract
The magnetic properties and magnetocaloric effect (MCE) in the ternary intermetallic compound of EuAuGe have been investigated. The compound undergoes a second-order magnetic phase transition at its own Curie temperatures T∼33 K. A large reversible table-like MCE has been observed from 1 to 40 K, which is related to the magnetic field-sensitive magnetic phase transition. For the magnetic field changes of 0-5 and 0-7 T, the maximum values of magnetic entropy change ( $-{\Delta } S_{\mathrm {M}}^{\max }$) are evaluated to be 7.6 and 10.1 J kg K, respectively; the corresponding relative cooling power ( RCP) are 358 and 499 J kg. The present results indicate that the EuAuGe compound is a considerable candidate for low-temperature refrigeration. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
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8. Structural, magnetic and magnetocaloric properties in the rare earth ruthenate RE3RuO7 (RE = Pr, Nd, Gd and Tb) oxides with fluorite related structure.
- Author
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He, Ningzhou, Wang, Pengyu, Huang, Jiaohong, Wang, Xinhua, Zhang, Yikun, Hu, Liang, Li, Lingwei, and Yan, Mi
- Subjects
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TERBIUM , *MANGANITE , *MAGNETIC properties , *RARE earth oxides , *MAGNETIC transitions , *MAGNETIC cooling , *MAGNETIC traps - Abstract
The magnetic refrigeration (MR) based on magnetocaloric effect (MCE) is a key technique, since it possesses ideally higher performance than the traditional gas compression technology. However, the lack of MR materials with excellent MCE performance is a bottle-neck for practical MR applications. Herein, we systematically report the structural properties using powder X-ray diffraction and scanning electron microscope as well as the magnetic and magnetocaloric properties through the magnetization measurements of four rare-earth (RE) ruthenate RE 3 RuO 7 (RE = Pr, Nd, Gd and Tb) compounds. Light RE -based Pr 3 RuO 7 and Nd 3 RuO 7 compounds form an orthorhombic Cmcm structure, while heavy RE based Gd 3 RuO 7 and Tb 3 RuO 7 compounds crystallize in an orthorhombic P 2 1 nb structure. The magnetic phase transition of all the present compounds are confirmed to be of the first-order type with T N of 52, 15, 11 and 12 K for Pr 3 RuO 7 , Nd 3 RuO 7 , Gd 3 RuO 7 and Tb 3 RuO 7 compounds, respectively. The related MCE parameters including the maximum isothermal magnetic entropy change, temperature-averaged entropy change (5 K lift), and refrigerant capacity with the magnetic field change of 0–5 T were computed to be 1.35 J/kgK, 1.31 J/kgK, and 27.4 J/kg for Pr 3 RuO 7 , to be 2.18 J/kgK, 2.04 J/kgK, and 25.6 J/kg for Nd 3 RuO 7 , to be 8.12 J/kgK, 7.90 J/kgK, and 124.6 J/kg for Gd 3 RuO 7 , and to be 7.78 J/kgK, 7.49 J/kgK, and 128.8 J/kg for Tb 3 RuO 7 , respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
9. 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
- Subjects
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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
- Full Text
- View/download PDF
10. 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
- Subjects
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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
- View/download PDF
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