Materials Today Physics
·
2025
·
IF 9.7
Jiwei Yao,Weijun Ren,Qing Guo,Peng Liu,Ziqi Guan,Changjiang Bao,Zhenquan Zhang,Dan Huang,Kun Zhang,Yanxu Wang,Dongliang Zhao,Jun He,Bing Li
Magnetic refrigeration is a promising technology capable of achieving sub-Kelvin temperatures without using 3 He. However, conventional magnetocaloric materials suffer from drawbacks such as high driving magnetic fields, low magnetic entropy change (Δ S M ), and structural instability, limiting their practical application. In this work, KGdF 4 with different crystal structures was synthesized, and the structure dependence of the magnetocaloric effect (MCE) was investigated. Notably, in the cubic KGdF 4 (C-KGdF 4 ), the chemical disorder of Gd 3+ /K + , increases the Gd 3+ -Gd 3+ distance and weakens the dipolar interactions, and thus leads to a large -Δ S M = 30.5 J kg −1 K −1 at 1.3 K at the magnetic field change of 10 kOe, which is more than three times of that of the commercial Gadolinium Gallium Garnet (Gd 3 Ga 5 O 12 , GGG) under the same conditions. Furthermore, the magnetic ordering temperature of 0.6 K of the C-KGdF 4 is lower than most reported Gd-based magnetocaloric materials. These excellent magnetocaloric performances suggest that C-KGdF 4 is a highly promising candidate for ultra-low-temperature magnetic refrigeration.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·13363-13371
·
IF 3.553
Cao Yutao,Yuan Yue,Shang Yafen,Zverev Vladimir I.,Gimaev Radel R.,Barua R.,Hadimani R. L.,Mei Lan,Guo Gang,Fu Hao
Micro-sized particles of Fe x Rh 100− x ( x = 50, 48, 45, 40, and 35) binary alloys were synthesized by a solid-phase reduction method and their structural properties, magnetic properties and cytotoxicity have been characterized. From X-ray diffraction results, the Fe 50 Rh 50 alloy is in a single chemically ordered α ′ phase while the face-centered cubic disordered γ phase arises and increases with Rh content when x is smaller than 50. The magnetization behavior of the alloys demonstrates that the α ′ phase consists of ferromagnetic and antiferromagnetic components due to the nonuniformity of elements in the particulate alloys. The maximal magnetic entropy change and the relative refrigeration capacity of the Fe 50 Rh 50 particles reach 9.7 J/kg K and 230 J/kg, respectively, with a 0–3 T magnetic field change. Despite its moderate magnetic entropy among the first-order transition materials, Fe 50 Rh 50 microparticles are promising for biomedical applications due to its large relative cooling power and low cytotoxicity.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 8
·1-13
·
IF 2.5
Xie Zhuojia,Xu Changji,Jiang Xinyu,Zhang Weijian,Feng Min,Zhong Shenglin,Zou Zhengguang
With the growing attention to perovskite materials in the field of magnetic refrigeration. In this work, La 0.8−x Pr x Sr 0.2 MnO 3 (x = 0.05, 0.10, 0.15) (LPSMO) samples were synthesized through the sol–gel method. The effects of Pr 3 ⁺ doping on the structure, morphology, and magnetization of LPSMO were investigated. The XRD analysis revealed that the LPSMO samples have a rhombohedral structure within the R-3c space group. As the amount of Pr 3 ⁺ doping increased, the cell volume decreased. The magnetic properties of LPSMO exhibited a transition from ferromagnetic (FM) to paramagnetic (PM) near the Curie temperature (Tc), with Tc decreasing as the Pr 3 ⁺ doping level increased. The second-order magnetic phase transition of LPSMO near Tc was confirmed by employing the MPMS. The maximum magnetic entropy change ( \(-\Delta {S}_{M}^{max}\) ) of LPSMO is 4.92 J/(kg·K) (x = 0.05), 5.13 J/(kg·K) (x = 0.10) and 5.04 J/(kg·K) (x = 0.15) when the external magnetic field (H) = 5 T, separately. Meanwhile, the relative cooling power ( RCP ) of LPSMO are 283.88, 276.71, and 289.60 J·kg −1 , respectively. The experiments indicate that LPSMO has promising application prospects.
研究领域:
材料科学
·
磁制冷技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Physics
·
2024
·
IF 10
Zhaojun Mo,Quanyi Liu,Wexiang Hao,Lingwei Li,Huicai Xie,Qi Fu,Xinqiang Gao,Jun Shen
We herein investigated the divalent europium borate Eu 2 B 2 O 5 compound regarding its structural, magnetic and magnetocaloric properties by means of experimental determinations and first principal calculations. The Eu 2 B 2 O 5 compound was found to crystallize in a monoclinic structure ( P 2 1 /c space group) and order ferromagnetically at ground state . A large cryogenic reversible MCE was observed in the Eu 2 B 2 O 5 compound around 2.7 K. The maximum values of magnetic entropy change of Eu 2 B 2 O 5 compound reach 13.7, 28.2 and 46.9 J/kgK under the magnetic field changes of 0–1, 0–2, and 0–5 T, respectively. The corresponding values of adiabatic temperature change and refrigerant capacity are obtained to be 3.3, 7.0, and 13.3 K and to be 37.8, 102.5, and 317.3 J/kg. These magnetocaloric parameters, especially under relatively low-field changes, are better than those of the reported candidate materials, which makes the Eu 2 B 2 O 5 compound attractive for cryogenic MR applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2024
·
IF 14.4
Bingjie Wang,Xinyang Liu,Fengxia Hu,Jian-tao Wang,Junsen Xiang,Peijie Sun,Jing Wang,Jirong Sun,Tongyun Zhao,Zhaojun Mo,Jun Shen,Yunzhong Chen,Qingzhen Huang,Baogen Shen
Adiabatic demagnetization refrigeration (ADR) based on the magnetocaloric effect (MCE) is a promising technique to achieve cryogenic temperature. However, magnetic entropy change (ΔSM), the driving force of ADR, remains far below theoretical −ΔSM = nRln(2J + 1)/MW for most magnetic refrigerants. Here, we report giant MCE in orthorhombic EuCl2, where a ferromagnetic ground state with excellent single-ion behavior of Eu2+ and free spins has been demonstrated by combining ab initio calculations with Brillouin function analysis and magnetic measurements. Consequently, a record-high −ΔSM ∼ 74.6 J·kg–1·K–1 (1.8 K) at 5 T was experimentally achieved, approaching 96% of the theoretical limit (77.5 J·kg–1·K–1). At a lower field of 1 T, EuCl2 also achieves the highest-ever record of −ΔSM ∼ 36.8 J·kg–1·K–1. Further, direct quasi-adiabatic demagnetization measurements demonstrate that its large −ΔSM allows EuCl2 to maintain a long holding time at sub-Kelvin temperature (∼346 mK), surpassing all previously reported materials. These superior magnetocaloric performances position EuCl2 as an attractive cryogenic refrigerant.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 21
·6754-6759
·
IF 7.393
Ziyu Yang,Jun-Yi Ge,Shuangchen Ruan,Hongzhi Cui,Yu-Jia Zeng
Herein, we report on the magnetic and magnetocaloric properties of a distorted double-perovskite, Gd2ZnTiO6, through static magnetization and heat capacity measurements, and mean-field analysis. The most pronounced isothermal magnetic entropy change −ΔSM, and relative cooling power RCP are found to be 53.5 J K−1 kg−1 and 620.6 J kg−1, respectively, under a field change of 9 T at 3.1 K with a large adiabatic temperature change Tad of 23.7 K, far exceeding the commercial cryo-coolant Gd3Ga5O12 (GGG). The results suggest that Gd2ZnTiO6 is a potential working refrigerant material for the targeted liquefaction of helium.
研究领域:
材料科学
·
低温物理学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 46
·12077-12082
·
IF 4.696
Chao Pang,Ling Gao,Anurag Chaturvedi,Ningzhong Bao,Kazumichi Yanagisawa,Liming Shen,Arunava Gupta
Magnetic spinel CdCr2S4 nanocrystals have been synthesized using a high-temperature solvothermal method. The synthesis process involves the reaction of excess 1-dodecanethiol (1-DDT) with CdCl2 and CrCl3·6H2O in 1-octadecene (ODE) solution carried out in a sealed titanium alloy autoclave. Nearly monodisperse spherical CdCr2S4 nanocrystals with an average size of 8.0 ± 1.5 nm are obtained. X-ray diffraction patterns confirm formation of the pure spinel phase without any impurities. Magnetic measurements indicate a Curie temperature (Tc) of ∼76 K for the synthesized CdCr2S4 nanocrystals, which are ferromagnetic at lower temperatures with a saturation magnetization value of 19 emu g−1 at 5 K. The magnetic entropy change ΔSm, evaluated from isothermal magnetic measurements, exhibits a maximum around 82 K, with a value of −ΔSm = 0.86 J kg−1 K−1 at Hmax = 5 T. ΔSm spans a broad temperature range, with a full width at half maximum of ∼88 K in the magnetic field range of 0–5 T, which is attractive for magnetic refrigeration applications in the liquid nitrogen temperature range.
研究领域:
材料科学
·
磁学
✓ 已验证
DOI
高影响因子
CRYOGENICS
·
2022
·
IF 2.134
Yuwei Chen,Wang Liu,Jingcheng Feng,Ruixin Guo,Feidi Fan,Jun Shen,Guochun Zhang,Heng Tu
A series of lanthanide-rich oxyborates LiLn 6 O 5 (BO 3 ) 3 (LLnOB, Ln = Gd, Tb, Dy, and Ho) have been synthesized using high temperature solid state method. Their magnetic and magnetocaloric properties were investigated upon magnetic susceptibility ( χ ), magnetization ( M ), and isothermal magnetic entropy change ( −ΔS m ) measurements. The maximum − ΔS m, max of LiGd 6 O 5 (BO 3 ) 3 is 44.7 J kg −1 K −1 at 4 K and Δμ 0 H = 9 T, which is higher than the one of commercial Gd 3 Ga 5 O 12 (GGG, −ΔS m, max = 41.8 J kg −1 K −1 at 2 K for Δμ 0 H = 9 T). For LiHo 6 O 5 (BO 3 ) 3 , −ΔS m, max is 14.12 J kg −1 K −1 at 3 K and Δμ 0 H = 2 T, which is also larger than that of Ho 3 Ga 5 O 12 (HoGG, − ΔS m, max = 4.38 J kg −1 K −1 at 2 K for Δμ 0 H = 2 T) and Dy 3 Ga 5 O 12 (DGG, − ΔS m, max = 11.0 J kg −1 K −1 at 2 K for Δμ 0 H = 2 T). These results indicate that LiGd 6 O 5 (BO 3 ) 3 and LiHo 6 O 5 (BO 3 ) 3 may be competitive candidates for applications as magnetic refrigerants. Moreover, thermal stability, infrared spectrum (IR), and ultraviolet–visible-near-infrared diffuse reflectance spectrum (UV–Vis-NIR) were carried out to characterize the title compounds.
研究领域:
材料科学
·
物理学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jiaxin Wang,Yifan Wang,Huixin Qiu,Huixia Zhu,Zhenyu Wang,Yue Li,Youshun Jia
We systematically study the crystal structure, magnetism and cryogenic magnetocaloric effect (MCE) in heavy rare-earth RE 6 MoO 12 ( RE = Tb, Dy, Ho, and Er) compounds. All RE 6 MoO 12 compounds belong to a cubic structure (space group: F m 3 − m ). Meanwhile, magnetic measurements illustrate that RE 6 MoO 12 compounds exhibit an antiferromagnetic (AFM) phase transition. It is proved by the slope of the basic Arrott-plots that all compounds undergo second-order magnetic phase transition (SOMT). In addition, under the applied magnetic change ΔH = 7 T, the maximum magnetic entropy change (-∆ S M max ) near Néel temperature ( T N ) is evaluated to be 12.9, 20.7, 21.1, and 21.2 J/kg K, and relative cooling power ( RCP ) is evaluated to be 308.3, 473.9, 506.2, and 381.4 J/kg for Tb 6 MoO 12 , Dy 6 MoO 12 , Ho 6 MoO 12 , and Er 6 MoO 12 , respectively. Consequently, our study underscores the magnetism and magnetocaloric effect properties exhibited by heavy rare-earth RE 6 MoO 12 compounds family, positioning them as a potential magnetic refrigerant in the field of low-temperature magnetic refrigeration.
研究领域:
凝聚态物理
·
材料科学
·
低温物理学
·
磁学
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yanchun Hu,Weixia Li,Xianwei Wang,Yawen Cui,Yuting Wei,Lingyun Sun,Tengyu Guo,Xiangyu Zhao
Double perovskite (Sr 1.8 Eu 0.13 Ba 0.07 )FeMoO 6 (SEBFMO) as well as Sr 2 FeMoO 6 (SFMO) were prepared by the traditional solid reaction method. X-ray diffraction results show that all compounds are single phase, which belongs to I4/ m space group. The magnetic hysteretic loops (M-H) and field-cooled magnetization (FC) curves indicate that all compounds have good ferromagnetic properties. The FC curves show a phase transition temperature at around 370 K. The Arrot plots (H/M-M 2 ) of samples show that a second-order magnetic transition has occurred. An enhanced magnetocaloric effect was observed in SEBFMO. The maximum isothermal magnetic entropy change of SEBFMO reaches to 0.76 J kg −1 K −1 for ∆H = 3 T, but that of SFMO only reaches to 0.50 J kg −1 K −1 .
研究领域:
材料科学
·
物理学
·
磁学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Qingwang Bai,Mingxiang Xu
Being the first intrinsic antiferromagnetic (AFM) topological insulator (TI), MnBi 2 Te 4 , has garnered significant attention as an ideal platform for realizing diverse exotic topological quantum states. However, little is known about the magnetocaloric properties of MnBi 2 Te 4 to date. In this work, we report the magnetocaloric effect, rotating magnetocaloric effect, and magnetocaloric switching effect of single-crystal MnBi 2 Te 4 . Under 0–9 T, the maximum magnetic entropy changes (−ΔS M ) obtained are 2.5 J kg −1 K −1 and 2.1J kg −1 K −1 , when H∥c and H∥ab, respectively. Furthermore, the anisotropy in the −ΔS M between the two crystallographic orientations gives MnBi 2 Te 4 single crystals a rotational magnetocaloric effect. The sample exhibits a rotating entropy change of 0.4J kg −1 K −1 under a magnetic field of 9 T as the magnetic field is rotated from the ab plane to the c axis. More importantly, MnBi 2 Te 4 exhibits a coexistence of conventional and inverse magnetocaloric effects by switching between them at a specific temperature and magnetic field, that is, the magnetocaloric switching effect. Moreover, the switching temperature of MnBi 2 Te 4 can be modulated by changing the magnetic field, so that it is suitable for various constant-temperature baths. This study provides a meaningful clue for the design and exploration of high performance MCE-based constant-temperature devices.
研究领域:
凝聚态物理
·
拓扑材料
·
磁热学
·
量子材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Huicai Xie,Quanyi Liu,Xiaohua Luo,Shengcan Ma,Xinqiang Gao,Zhenxing Li,Zhaojun Mo,Jun Shen
For more practical applications, research on magnetic refrigeration has been gradually focused on developing refrigerants with large magnetocaloric effect (MCE) under low magnetic fields (≤2 T). EuTiO 3 exhibits considerable low-field MCE near ordering temperature, meanwhile the magnetic switch from antiferromagnetic to ferromagnetic (AFM-FM) in it provides the feasibility of improving the magnetocaloric performance. In this study, a series of Eu(Ti,Nb,M)O 3 (M=Cu or Zn) compounds were synthesized, and the crystal structure, magnetic properties together with cryogenic MCEs were investigated in detail. The co-substitution contributes to an FM coupling domination in all the compounds. Besides, significantly enhanced and giant low-field MCEs were detected in these compounds. Under the field change of 1 T, all the samples possess remarkable magnetic entropy change (>15 J·kg -1 ·K -1 ) around 5 K without hysteresis. The corresponding refrigerating capacities are calculated to be 68.0, 72.6, 76.0, and 69.6 J·kg -1 , respectively, exhibiting an increase of 149–178% than EuTiO 3 . The outstanding magnetocaloric performances make the Eu(Ti,Nb,M)O 3 (M=Cu or Zn) compounds competitive candidates for cryogenic magnetic refrigeration.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
低温工程
·
磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）