Article
Chemistry, Applied
Fengqing Wang, Xiaojie Hu, Youhao Liu, Jian Zhang
Summary: In this study, a designed low-rate electroless deposition method was used to produce strong textured anisotropic Sm-Pr-Co/Co nanocomposites with unusual continuous soft-phase coatings. The obtained composites exhibited high intrinsic coercivity and enhanced remanence compared to the uncoated hard phase. The study also revealed a nucleation control mechanism for the formation of the continuous coating structures. The production of downsized nanocomposites with tailored size below 300 nm or even below 100 nm was also achieved. This study is of theoretical and practical importance for the development of advanced nanostructures.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Multidisciplinary
Yangkun He, Peter Adler, Sebastian Schneider, Ivan Soldatov, Qingge Mu, Horst Borrmann, Walter Schnelle, Rudolf Schaefer, Bernd Rellinghaus, Gerhard H. Fecher, Claudia Felser
Summary: The authors report on the intrinsic highly-anisotropic magnetic properties of Co and Si co-doped single crystals, which exhibit performance superior to rare-earth magnets without containing rare earth elements. By controlling the doping concentration, the material achieved maximum magnetocrystalline anisotropy and Curie temperature in experiments, showing great potential for the development of permanent magnets.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Zhixing Ye, Xiaotian Zhao, Long Liu, Wei Liu, Jinghui Wang, Jinxiang Wu, Yang Li, Jun Ma, Hongzhan Ju, Zhidong Zhang
Summary: Increasing the ratio of Dy in the Nd-Dy diffusion layers of NdFeB thick films leads to a slight enhancement of saturation magnetization, while coercivity and remanent magnetization are greatly enhanced. The increase in coercivity is attributed to the decoupling between Nd2Fe14B grains and the enhanced pinning effect, while the increase in the proportion of Nd2Fe14B grains results in a slight enhancement of saturation magnetization.
Article
Materials Science, Multidisciplinary
Bo Jiang, Yapeng Li, Qian Zhang, Li Lou, Wenpeng Song, Bo He, Jingdong Wang, Hai-Tian Zhang, Xiaohong Li
Summary: In this study, an anisotropic bulk RE-free magnet with crystallographic texture and refined grains was successfully fabricated. The magnet exhibited a (00 l) crystallographic texture obtained through confined deformation during the phase transformation. The deformed magnet showed significant magnetic anisotropy and enhanced magnetic properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Applied
You-Song Ding, Yan-Zhen Zheng
Summary: The study focuses on the anisotropic magnetocaloric effect in a Dy(III) single molecule magnet, and the high magnetic anisotropy allows it to be used as a rotating magnetic refrigerant at low temperatures. The angular dependent magnetization can be observed in single crystals due to its high magnetic anisotropy, making it a promising candidate for low-temperature applications.
JOURNAL OF RARE EARTHS
(2021)
Article
Computer Science, Interdisciplinary Applications
Tao Wang, Antoine Wautier, Jungao Zhu, Francois Nicot
Summary: This study investigates the influence of coarse grains on the geometrical fabric and mechanical state of cohesionless overfilled binary mixtures using 2D discrete element method simulations. The results demonstrate that coarse grains enhance the stability of cohesionless overfilled binary mixtures by limiting macroscopic plastic deformation. Coarse grains act as attractors of force chains, promoting more connected contact force networks in overfilled binary mixtures. Micromechanical analyses further reveal that embedded coarse grains in overfilled binary mixtures have a long-range influence, forming fine bridges that improve stress transmission and bearing capacity.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Materials Science, Multidisciplinary
Bang Zhou, Weisen Huang, Wenbing Fan, Hongrui Zhang, Hongya Yu, Kewen Long, Zhongwu Liu
Summary: The microstructure, magnetic properties, corrosion and aging resistance, and mechanical properties of Nd-Fe-B, (Nd, La, Ce)-Fe-B, and (Ce, La, Y)-Fe-B rubber magnets were investigated. The study found that increasing the filling ratio and particle size improves the magnetic properties and tensile strength. The full high-abundance (Ce, La, Y)-Fe-B rubber magnet showed competitive advantage in performance stability.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Geochemistry & Geophysics
Ronei Tiago Stein, Angela Cristina Kasper, Hugo Marcelo Veit
Summary: The recovery of materials from secondary sources is increasingly necessary due to material scarcity. This study evaluated the leaching efficiency of acetic and citric acids in extracting neodymium and praseodymium from obsolete or defective mobile phones. The results suggest that both acids have the potential to effectively leach these rare earth elements, and microwave leaching is the most effective method compared to ultrasound and conventional methods.
Article
Materials Science, Ceramics
Junyan Zhang, Dongpo Song, Jung-Kun Lee
Summary: The Cr doping in Bi5CrxFe1-xTi3O15 films leads to changes in microstructure and electrical properties, with an increase in saturated polarization and a decrease in coercive field. The decrease in lattice aspect ratio promotes the alignment of ferroelectric dipoles, ultimately controlling the ferroelectricity of the thin films.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Engineering, Chemical
Jong Hyuk Jeon, Ho-Sung Yoon, Chul-Joo Kim, Kyeong Woo Chung, Rajesh Kumar Jyothi
Summary: An environmentally friendly process was investigated to extract and separate rare earth elements from waste permanent magnets. Different solvent extraction methods were tested to optimize the extraction system, with Cyanex 272 identified as the most effective reagent for recovery and potential separation between REEs. Experimental factors and conditions were studied to maximize rare earth enrichment while effectively separating them.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Applied
Yeyuan Du, Wenzong Yin, Renjie Chen, Xu Tang, Jinyun Ju, Bin Chen, Longquan Hou, Aru Yan, Jianhui Yuan
Summary: The Nd-Fe-B hot-pressed magnet prepared from melt-spun flakes shows coarse grains with varying sizes influenced by the surface phase enrichment and oxygen content of the flakes. Decreasing oxygen content leads to increased coercivity in the magnet, while remanent magnetization remains unaffected.
JOURNAL OF RARE EARTHS
(2021)
Article
Engineering, Mechanical
Yangqi Li, Haiming Zhang, Xiaoqing Shang, Mingxiang Liu, Shilin Zhao, Zhenshan Cui
Summary: This study investigates the microscopic deformation heterogeneity in mixed-grain structures with millimeter-grade coarse grains (MCGs) and proposes a mesoscale crystal plasticity (CP) model to describe the uneven grain size effect. The results show that a large deformation band is preferentially generated during deformation, covering the MCG and its surrounding fine grains (FGs), resulting in intense strain and stress localizations. It is found that the preferential deformation characteristic of the MCG is related to its 'lake' shape distribution of the number of activated slip systems (N-s). The study also reveals that the MCG deforms in single-slip at early deformation and in primary-slip at large deformation. Compared with the FG structure, the MCGs have weaker initial slip resistance and hardening rate.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Nanoscience & Nanotechnology
Yong Zhang, Pengfei Wu, Wenquan Ming, Xun Cao, Yizhong Huang, Zhiming Li
Summary: It is reported that the presence of Sm2O3 microparticles in Sm2Co17-type magnets may deteriorate their magnetic properties but improve mechanical and electrical performance. In this study, the distribution, structure, and elastic properties of Sm2O3 in a high-end Sm2Co17-type magnet were investigated. The results showed that the Sm2O3 microparticles with a size of 4.8 ± 2.1 μm were randomly dispersed in the magnet and acted as preferential sites for segregation of Zr-rich inclusions. The indexed structure of Sm2O3 was found to be metastable trigonal A-type, and its nano-twinned structure exhibited ductility, which could effectively reduce the brittleness of the magnet. This work provides insights into balancing the magnetic and mechanical properties of Sm2Co17-type magnets.
SCRIPTA MATERIALIA
(2023)
Article
Multidisciplinary Sciences
Abdallah Shokry, Aylin Ahadi, Per Stahle, Dmytro Orlov
Summary: This study develops two-dimensional finite-element models for pure nickel with bimodal distributions of grain sizes, exploring the effects of different topological structures. The bimodal harmonic-structure material demonstrates significantly higher strength and ductility than the bimodal random-structure, exceeding expectations based on the rule of mixtures.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Inorganic & Nuclear
Michael L. Tarlton, Richard E. Wilson
Summary: Two series of rare earth nitrate complexes have been synthesized and characterized. The study provides insights into the structure-directing influences of lanthanide contraction and quaternary ammonium cations.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)