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学者姓名：岳明
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Abstract ：
This study investigates the significant correlation between preparation techniques, calcination temperatures, and the magnetic properties of La-Ca-Co-doped strontium ferrite. By comparing typical dry mixing and wet mixing processes and investigating the effects of different calcination temperatures, this work reveals detailed insights into how to optimize the magnetic performance of these materials. Results show that dry mixing at 1260 degrees C produces the largest magnetic energy product (35.4 kJ/m(3)) when sintered at 1225 degrees C, with a maximum remanence of 437 mT and coercivity of 384 kA/m. Conversely, wet mixing at 1230 degrees C produces the optimal magnetic performance as a coercivity of 415 kA/m, remanence of 435 mT and (BH)(max) of 33.4 kJ m(-3) at a sintering temperature of 1215 degrees C. Wet mixing is better for low-temperature calcination due to reduced particle size, greater specific surface area, and lower energy needs. The dry mixing technique at 1260 degrees C and the wet mixing process at 1230 degrees C yield good magnetic characteristics for La-Ca-Co doped strontium ferrite. The importance of calcination temperatures and preparation methods on the magnetic properties of doped ferrite is highlighted in this research.
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| GB/T 7714 | Haseeb, Muhammad , Li, Yuqing , Zhang, Hongguo et al. Effect of initial mixing process and calcination temperature on magnetic properties of La-Ca-Co doped strontium ferrite [J]. | AIP ADVANCES , 2025 , 15 (3) . |
| MLA | Haseeb, Muhammad et al. "Effect of initial mixing process and calcination temperature on magnetic properties of La-Ca-Co doped strontium ferrite" . | AIP ADVANCES 15 . 3 (2025) . |
| APA | Haseeb, Muhammad , Li, Yuqing , Zhang, Hongguo , Farooq, Muhammad Sabil , Liu, Rongming , Yue, Ming . Effect of initial mixing process and calcination temperature on magnetic properties of La-Ca-Co doped strontium ferrite . | AIP ADVANCES , 2025 , 15 (3) . |
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Abstract ：
To address the demands of rapidly advancing precision instruments requiring higher efficiency and miniaturization, permanent magnets must exhibit exceptional energy density, temperature stability, high magnetic energy product [(BH)max], and adequate coercivity (Hcj). Herein, we design rare earth Er-based magnets (2 : 17-type Er-magnets) with a composition of (Er, Sm)(Co, Fe, Cu, Zr)7.6. Erbium-based compounds (Er2Co17) offer a unique combination of temperature compensation and high saturation magnetization compared to other heavy rare earth elements, resulting in 2 : 17-type Er-magnets with superior temperature stability in Br and (BH)max. Partially substituting Sm reduces the energy barrier for the 2 : 17H-to-2 : 17R phase transition, promoting the development of a complete cellular structure and achieving enhanced coercivity. Notably, the optimal performance is obtained with Er constituting 60% of the total rare earth content, delivering a near-zero temperature-coefficient for Br and (BH)max within 20-150 degrees C while maintaining Br at 8.92 kG, Hcj at 29.83 kOe, and (BH)max at 18.5 MGOe. These 2 : 17-type Er-magnets provide valuable insights for developing permanent magnets with exceptional comprehensive properties.
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| GB/T 7714 | Long, Zan , Zhang, Chaoyue , Li, Yuqing et al. Erbium: key to simultaneously achieving superior temperature-stability and high magnetic properties in 2: 17-type permanent magnets [J]. | MATERIALS HORIZONS , 2025 . |
| MLA | Long, Zan et al. "Erbium: key to simultaneously achieving superior temperature-stability and high magnetic properties in 2: 17-type permanent magnets" . | MATERIALS HORIZONS (2025) . |
| APA | Long, Zan , Zhang, Chaoyue , Li, Yuqing , Zhang, Baoguo , Bian, Mengying , Ling, Chong et al. Erbium: key to simultaneously achieving superior temperature-stability and high magnetic properties in 2: 17-type permanent magnets . | MATERIALS HORIZONS , 2025 . |
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Abstract ：
Ferromagnetic Co nanowires based on the synergistic effect of shape anisotropy and magnetocrystalline anisotropy appear to be apt candidates as rare-earth-free permanent magnetic materials. This study systematically investigates the angular dependence and proximity effects on the magnetic properties of polyol-synthesized Co nanowires using first-order reversal curve (FORC) analysis. The FORC diagram of the dilute Co nanowire array exhibits characteristics similar to an ensemble of non-interacting single-domain particles. Angular-dependent FORC analysis, performed on the dilute nanowire array with easy-axis angles ranging from 0 degrees to 90 degrees relative to the applied field, reveals a strong correlation between the irreversible magnetization fraction and the magnetic properties. The proximity effect arising from nanowire stacking enhances magnetostatic interactions, resulting in FORC pattern expansion. Specifically, the FORC diagram of the high-density Co nanowire array exhibits a distinctive "wishbone" or boomerang structure. The physical significance of the FORC diagrams for the Co nanowire array was discussed based on the Stoner-Wohlfarth model. This work offers valuable guidance for designing and controlling the nanomagnetic characteristics of Co nanowires, with potential implications for advancing their application in permanent magnets.
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| GB/T 7714 | Yang, Zhi , Zhang, Jie , Chen, Yuanyuan et al. Angular dependence and proximity effect of dense arrays of cobalt nanowires as rare-earth-free permanent magnets [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2025 . |
| MLA | Yang, Zhi et al. "Angular dependence and proximity effect of dense arrays of cobalt nanowires as rare-earth-free permanent magnets" . | JOURNAL OF MATERIALS CHEMISTRY C (2025) . |
| APA | Yang, Zhi , Zhang, Jie , Chen, Yuanyuan , Wang, Yatao , Wu, Qiong , Zhang, Hongguo et al. Angular dependence and proximity effect of dense arrays of cobalt nanowires as rare-earth-free permanent magnets . | JOURNAL OF MATERIALS CHEMISTRY C , 2025 . |
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The impact of introducing the 3d transition metal vanadium (V) into the Ge site of the MnCoGe system has been investigated both theoretically and experimentally. Calculations reveal that V alters local bonding characteristics and reduces the structural transformation temperature when its concentration on the Ge site is below 25 %. However, higher V content induces phase instability, making it challenging to form a single-phase MnCo(Ge, V) alloy. To address this, a combination of melt spinning and post-annealing was employed, successfully extending the V content to 10 % on the Ge site. This process resulted in a complete Curie temperature window with a width of approximately 100 K, and the annealed ribbons exhibited a relative cooling power (RCP) 46% higher than that of the ingot samples. This study demonstrates a strategy for stabilizing structure and achieving magnetostructural coupling by introducing d-d hybridization to partially replace p-d hybridization, offering a pathway for developing new MM'X-based materials.
Keyword ：
Magnetostructural transformation Magnetostructural transformation Curie temperature window Curie temperature window MM'X MM'X Magnetic refrigeration Magnetic refrigeration
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| GB/T 7714 | Wang, Xiangming , Zhang, Hongguo , Shi, Jinhao et al. Tuning structural transformations in MnCoGe system: The role of vanadium-induced d-d hybridization [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1010 . |
| MLA | Wang, Xiangming et al. "Tuning structural transformations in MnCoGe system: The role of vanadium-induced d-d hybridization" . | JOURNAL OF ALLOYS AND COMPOUNDS 1010 (2025) . |
| APA | Wang, Xiangming , Zhang, Hongguo , Shi, Jinhao , Zhang, Xiaoming , Yue, Ming . Tuning structural transformations in MnCoGe system: The role of vanadium-induced d-d hybridization . | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1010 . |
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Abstract ：
This study addresses the challenges of low diffusion efficiency and minimal coercivity enhancement in Ce-based sintered magnets through the grain boundary diffusion (GBD) technique. By conducting a comprehensive experimental and theoretical analysis of La-substituted Ce-based magnets, we have uncovered the detrimental impact of the REFe2 phase on grain boundary (GB) structure and the diffusion process. Our findings confirm that an optimal La substitution for Ce effectively mitigates these issues. This substitution reduces the stability and Dy content of the REFe2 phase while enhances the continuity of the lamellar GB phases. Consequently, the Dy element utilized in the diffusion process achieves a greater depth of penetration and a more uniform distribution, leading to a significant coercivity increase of 4.28 kOe in the GBD magnet with the ideal La content, an 8.35 % improvement over the La-free magnet. This research reveals the underlying mechanisms and offers a viable solution for enhancing the GBD effect in Ce-based sintered magnets. Furthermore, it underscores the pivotal interplay between phase stability, grain boundary structure, and diffusion dynamics in the advancement of nextgeneration GBD techniques for permanent magnets.
Keyword ：
Grain boundary diffusion Grain boundary diffusion REFe 2 phases REFe 2 phases High-abundance La/Ce magnet High-abundance La/Ce magnet Coercivity Coercivity
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| GB/T 7714 | Chen, Hao , Zhang, Hongguo , Liu, Weiqiang et al. Overcoming grain boundary diffusion challenges in Ce-based sintered magnets: La substitution as a pathway to enhanced coercivity [J]. | ACTA MATERIALIA , 2025 , 285 . |
| MLA | Chen, Hao et al. "Overcoming grain boundary diffusion challenges in Ce-based sintered magnets: La substitution as a pathway to enhanced coercivity" . | ACTA MATERIALIA 285 (2025) . |
| APA | Chen, Hao , Zhang, Hongguo , Liu, Weiqiang , Li, Yuqing , Wang, Zhanjia , Wu, Haihui et al. Overcoming grain boundary diffusion challenges in Ce-based sintered magnets: La substitution as a pathway to enhanced coercivity . | ACTA MATERIALIA , 2025 , 285 . |
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Abstract ：
In this study, we have prepared high-performance (Nd, Ce)-Fe-B magnets with 16.95 wt% and 23.73 wt% Ce / total rare earth (TRE) content, as well as Dy diffusion magnets. The concern between the CeFe2 phase, microstructure, and coercivity of the magnets was clarified. When the Ce / TRE content increased to 23.73 wt%, a little of the CeFe2 phase appeared in the magnet, which improved the fluidity of the liquid phase, promoted the formation of grain boundary phases (GBs), and optimized the microstructure. Therefore, when the GBs thickness increased to 6.39 nm, the coercivity slightly increased. However, in the subsequent heavy rare earth grain boundary diffusion, the coercivity increment (Delta Hcj) of the magnet with the CeFe2 phase was 2.96 kOe, lower than the 4.68 kOe in the magnet without the CeFe2 phase. From theoretical calculations and experimental results, the diffusion channel of the Dy elements was blocked by the CeFe2 phase, and the Dy atom would enter the CeFe2 phase to form the (Ce, Dy)Fe2 phase. Therefore, the presence of the CeFe2 phase led to a smaller diffusion depth of Dy elements, less core-shell structure of the main phase, lower effective Dy utilization rate, and lower Delta Hcj.
Keyword ：
Nd-Ce-Fe-B magnet Nd-Ce-Fe-B magnet Dy elements Dy elements Coercivity increment Coercivity increment GBD magnets GBD magnets CeFe 2 phase CeFe 2 phase
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| GB/T 7714 | Qin, Yuan , Wang, Xiangming , Zhang, Lele et al. Analysis of the influence mechanism of CeFe2 phase on coercivity in high-performance Nd-Ce-Fe-B diffusion magnets [J]. | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2025 , 623 . |
| MLA | Qin, Yuan et al. "Analysis of the influence mechanism of CeFe2 phase on coercivity in high-performance Nd-Ce-Fe-B diffusion magnets" . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 623 (2025) . |
| APA | Qin, Yuan , Wang, Xiangming , Zhang, Lele , Fan, Min , Song, Jie , Wang, Gang et al. Analysis of the influence mechanism of CeFe2 phase on coercivity in high-performance Nd-Ce-Fe-B diffusion magnets . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2025 , 623 . |
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Abstract ：
The structure and phase modification of sintered Nd-Fe-B magnets through Tb diffusion from two different sources, nano TbHx and TbF3 particles, and their effects on magnetic and corrosion-resistant properties, were investigated. The results demonstrate that Tb diffusion from TbHx leads to an optimized microstructure with fewer anti-core-shell grains, a longer diffusion distance, and better magnetic isolation than TbF3. In contrast, TbF3 facilitates Tb diffusion into the main phase and also blocks its diffusion channels in the grain boundaries, resulting in accumulation at the surface and significantly reducing the diffusion efficiency of the Tb element. Additionally, the study reveals a key role of Tb in influencing the electrode potential of different phases and, consequently, the corrosion behavior of Nd-Fe-B magnets. Tb diffusion slightly increases the electrode potential of the shell of main phase grains while significantly increasing that of the Nd-O phase. It thus reduces the interphase potential difference thereby enhancing the corrosion resistance of the magnets. However, when TbF3 is used for diffusion, the formation of a new (Nd, Tb)-O-F phase, which exhibits significantly lower potential than the (Nd, Tb)-O phase, leads to a deterioration in corrosion resistance. These findings provide valuable insights into the magnetic and corrosion behaviors of grain boundary diffusion magnets and highlight key factors for developing advanced permanent magnets with enhanced overall performance.
Keyword ：
Electrode potential Electrode potential (Nd (Nd Nd-Fe-B magnets Nd-Fe-B magnets Tb)-O-F Tb)-O-F Corrosion resistance Corrosion resistance Grain boundary diffusion Grain boundary diffusion
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| GB/T 7714 | Ji, Ming , Zhang, Hongguo , Liu, Weiqiang et al. Strengthening magnetic and corrosion performances of NdFeB magnets via grain boundary diffusion with Tb element [J]. | MATERIALS CHARACTERIZATION , 2025 , 223 . |
| MLA | Ji, Ming et al. "Strengthening magnetic and corrosion performances of NdFeB magnets via grain boundary diffusion with Tb element" . | MATERIALS CHARACTERIZATION 223 (2025) . |
| APA | Ji, Ming , Zhang, Hongguo , Liu, Weiqiang , Wang, Xiangming , Wang, Zhanjia , Guo, Zizhen et al. Strengthening magnetic and corrosion performances of NdFeB magnets via grain boundary diffusion with Tb element . | MATERIALS CHARACTERIZATION , 2025 , 223 . |
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Abstract ：
In this article, the element distribution was optimized by introducing isothermal annealing for the (Sm0.4Er0.6)2Co17 alloys and magnet with remanence temperature-coefficient (20-150 degrees C) of -0.00087 %/degrees C and coercivity of 30.0 kOe was finally prepared, along with (BH)max of 18.1 MGOe. The low remanence temperaturecoefficient reveals that the (Sm0.4Er0.6)2Co17 magnet can provide a steady magnetic flux suitable for application in precision instruments. In addition, the composition distribution in the magnet was analyzed in detail, and the contribution of the non-uniform distribution of Er to the coercivity was revealed through micromagnetic simulations. The results of micromagnetic simulations confirm that the concentrated distribution of Er in the intracellular phase is beneficial for maintaining high coercivity of (Sm0.4Er0.6)2Co17 magnets. This finding can provide effective reference for the development of rare-earth permanent magnets with outstanding temperature stability, and promote the development of precision instruments.
Keyword ：
Coercivity mechanism Coercivity mechanism Micromagnetic simulation Micromagnetic simulation Magnetic properties Magnetic properties Temperature-coefficient Temperature-coefficient Rare-earth permanent magnets Rare-earth permanent magnets
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| GB/T 7714 | Long, Zan , Zhang, Chaoyue , Li, Yuqing et al. Non-uniform distribution of rare-earth elements causing high-coercivity in temperature-compensated (SmEr)2Co17 magnets [J]. | MATERIALS LETTERS , 2025 , 385 . |
| MLA | Long, Zan et al. "Non-uniform distribution of rare-earth elements causing high-coercivity in temperature-compensated (SmEr)2Co17 magnets" . | MATERIALS LETTERS 385 (2025) . |
| APA | Long, Zan , Zhang, Chaoyue , Li, Yuqing , Zhang, Baoguo , Wu, Qiong , Yue, Ming . Non-uniform distribution of rare-earth elements causing high-coercivity in temperature-compensated (SmEr)2Co17 magnets . | MATERIALS LETTERS , 2025 , 385 . |
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Since the magnetic properties of waste bonded Nd-Fe-B magnets are diluted by polymer binders, the binders need to be separated to obtain pure Nd-Fe-B magnetic powders. In this work, we used alkaline alcohol solution to recycle waste bonded Nd-Fe-B magnets. The relationship between the decomposition effect of the binder, the magnetic properties of the recycled Nd-Fe-B powder and the treatment conditions was studied. The results showed that the increase of reaction temperature and alkali concentration was conducive to the thorough removal of the epoxy resin binder, so as to improve the magnetization. In ethylene glycol solution with 3 mol/L NaOH at 90 degrees C for 8 h, the saturation magnetization of the recycled Nd-Fe-B powder reached 99.22 % of the original Nd-Fe-B powder. However, coercivity decreased 78.14 % at 180 degrees C compared to waste powder. To study the reason of coercivity deterioration of recycled Nd-Fe-B powder, the structure changes of recycled Nd-Fe-B powders were studied. Under alkaline condition, passivation layer was formed on the surface of Nd-Fe-B powder. When the temperature rose, pitting corrosion occurred on the passivation layer, and the solution diffused into the Nd-Fe-B powder, resulting in the decomposition of Nd2Fe14B phase and the accumulation of alpha-Fe. The weakening of exchange coupling between soft and hard phases led to the decrease of coercivity. Therefore, there was a mutually restricted relationship between the removal effect of binder and the magnetic properties of NdFe-B powder. By controlling suitable recovery conditions, high performance recycled Nd-Fe-B nanocrystalline powder can be obtained.
Keyword ：
Resin binder decomposition Resin binder decomposition Surface chemical state Surface chemical state Coercivity mechanism Coercivity mechanism Bonded Nd-Fe-B magnet waste Bonded Nd-Fe-B magnet waste Passivation layer Passivation layer
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| GB/T 7714 | Zhu, Peihong , Liu, Min , Xue, Peipei et al. Recycling polymer-bonded Nd-Fe-B nanocrystalline powders: Structure and magnetism evolution [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1020 . |
| MLA | Zhu, Peihong et al. "Recycling polymer-bonded Nd-Fe-B nanocrystalline powders: Structure and magnetism evolution" . | JOURNAL OF ALLOYS AND COMPOUNDS 1020 (2025) . |
| APA | Zhu, Peihong , Liu, Min , Xue, Peipei , Yang, Yaxuan , Liu, Weiqiang , Lu, Qingmei et al. Recycling polymer-bonded Nd-Fe-B nanocrystalline powders: Structure and magnetism evolution . | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1020 . |
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Abstract ：
Developing high-performance nanocrystalline SmCo permanent magnets is essential for high-temperature applications in advanced electromechanical equipment. In this study, the nanocrystalline anisotropic Sm0.4Pr0.6Co5 magnets with controllable magnetic properties were achieved by adjusting the deformation temperature. The Sm0.4Pr0.6Co5 magnet deformed at 780 degrees C showed a high coercivity of 19.7 kOe (1.57 MA/m) at 300 K and of 9.3 kOe (0.739 MA/m) at 573 K, resulting in the temperature coefficient of -0.189 %/degrees C. The magnet deformed at 840 degrees C exhibited a strong c-axis texture and the maximum magnetic energy product of 22.3 MGOe (177 kJ/ m3). The hot-deformed Sm0.4Pr0.6Co5 magnets showed the microstructure with coexisting RECo5 main phase grains and dispersible RE-rich phase nanoprecipitates. As the temperature increased, the crystallographic orientation, grain size and magnetic domain size were increased. The coercivity mechanism of hot-deformed Sm0.4Pr0.6Co5 magnets was controlled by nucleation, and the high deformation temperature led to a decrease in the reverse nucleation field and coercivity, accompanied by a large reversible magnetization during magnetization reversal and a large recoil magnetic permeability. This study provides valuable insights into optimizing the microstructure and magnetic properties of nanocrystalline SmCo5 magnets, which is expected to promote high temperature applications of rare earth permanent magnet materials.
Keyword ：
Magnetic domain Magnetic domain Microstructure Microstructure SmCo 5 magnet SmCo 5 magnet Permanent magnetic materials Permanent magnetic materials Magnetic properties Magnetic properties
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| GB/T 7714 | Liu, Lin , Li, Yuqing , Liu, Wenhe et al. Controllable magnetic properties and microstructure of nanocrystalline Sm0.4Pr0.6Co5 magnets by regulating deformation-temperature [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1010 . |
| MLA | Liu, Lin et al. "Controllable magnetic properties and microstructure of nanocrystalline Sm0.4Pr0.6Co5 magnets by regulating deformation-temperature" . | JOURNAL OF ALLOYS AND COMPOUNDS 1010 (2025) . |
| APA | Liu, Lin , Li, Yuqing , Liu, Wenhe , Xia, Weixing , Bian, Mengying , Song, Wenna et al. Controllable magnetic properties and microstructure of nanocrystalline Sm0.4Pr0.6Co5 magnets by regulating deformation-temperature . | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1010 . |
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