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^(57)Fe Mössbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE–Fe–B permanent magnets

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Chinese Physics B 2021年第1期30卷 73-86页

作者： Lizhong Zhao Xuefeng Zhang Mi Yan Zhongwu Liu jean-marc greneche Institute of Advanced Magnetic Materials College of Materials&Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310018China State Key Laboratory of Silicon Materials School of Materials Science and EngineeringKey Laboratory of Novel Materials for Information Technology of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China Institut des Mol´ecules et Mat´eriaux du Mans CNRS UMR-6283 Le Mans Universit´eLe Mans F-72085France

This review summarizes the recent advances on the application of ^(57)Fe Mössbauer spectrometry to study the magnetic and phase characteristics of Nd–Fe–B-based permanent magnets. First of all, the hyperfine structures of the Ce_(2)Fe_(14)B,(Ce,Nd)_(2)Fe_(14)B and MM_(2)Fe_(14)B phases are well-defined by using the model based on the Wigner-Seitz analysis of the crystal structure. The results show that the isomer shift δ and the quadrupole splitting öEQ of those 2:14:1 phases show minor changes with the Nd content, while the hyperfine field Bhfincreases monotonically with increasing Nd content and its value is influenced by the element segregation and phase separation in the 2:14:1 phase. Then, the hyperfine structures of the low fraction secondary phases are determined by the ^(57)Fe Mössbauer spectrometry due to its high sensitivity. On this basis,the content, magnetic behavior, and magnetization of the REFe_(2) phase, the amorphous grain boundary(GB) phase, and the amorphous worm-like phase, as well as their effects on the magnetic properties, are systematically studied.

关键词： ^(57)Fe Mössbauer spectrometry Nd–Fe–B-based permanent magnets (Ce,Nd)_(2)Fe_(14)B phase grain boundary phase

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Influence of gadolinium and dysprosium substitution on magnetic properties and magnetocaloric effect of Fe78-xRExSi4Nb5B12Cu1 amorphous alloys

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Journal of Rare Earths 2020年第12期38卷 1317-1321页

作者： Lizhong Zhao Huacun Tian Xichun Zhong Zhongwu Liu jean-marc greneche R.V.Ramanujan Institute of Advanced Magnetic Materials Hangzhou Dianzi UniversityHangzhou 310012China School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China Guangdong Institute of Special Equipment Inspection and Research Guangzhou 528251China Institut des Molecules et Materiaux du Mans UMR CNRS 6283 Le Mans UniversiteAvenue MessiaenLe MansF-72085France School of Materials Science and Engineering Nanyang Technological University639798Singapore Singapore-HUJ Alliance for Research and Enterprise(SHARE) Nanomaterials for Energy and Energy-Water Nexus(NEW)Campus for Research Excellence and Technological Enterprise(CREATE)Singapore138602Singapore

Amorphous Fe78-xRExSi4 Nb5 B12Cu1(RE=Gd,Dy) ribbons with different RE contents were prepared by melt spinning to investigate the effect of heavy rare earth(Gd,Dy) substitution on the hyperfine structure,magnetic properties and magnetocaloric *** Curie temperature of RE substituted alloys,hyperfine field and magnetic moments of Fe atoms initially increase up to 1 at% RE content and then decrease monotonously for increasing RE content up to 10 at%.The dependence of magnetic entropy change(-△SM) and refrigeration capacity(RC) of the alloys on RE contents displays the same *** RCAREA values of the alloys substituted with 1 at% Gd and Dy are similar to those of recently reported Fe-based metallic glasses with enhanced RC values compared with those of Gd5 Ge1.9Si2 ***-△SM and RC values,negligible coercive force and hysteresis commonly make these Fe78-xREx-Si4 Nb5 B12Cu1 amorphous alloys as low-cost candidates for high-temperature magnetic refrigeration.

关键词： Magnetic properties Magnetocaloric effect Refrigeration capacity Rare earths

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57Fe M?ssbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE–Fe–B permanent magnets

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Chinese Physics B 2021年第1期30卷 92-105页

作者：赵利忠张雪峰严密刘仲武 jean-marc greneche Institute of Advanced Magnetic Materials College of Materials & Environmental Engineering Hangzhou Dianzi University School of Materials Science and Engineering South China University of Technology State Key Laboratory of Silicon Materials School of Materials Science and EngineeringKey Laboratory of Novel Materials for Information Technology of Zhejiang Province Zhejiang University Institut des Molécules et Matériaux du Mans CNRS UMR-6283 Le Mans Université

This review summarizes the recent advances on the application ofFe M?ssbauer spectrometry to study the magnetic and phase characteristics of Nd–Fe–B-based permanent magnets. First of all, the hyperfine structures of the CeFeB,(Ce,Nd)FeB and MMFeB phases are well-defined by using the model based on the Wigner-Seitz analysis of the crystal structure. The results show that the isomer shift δ and the quadrupole splitting ?Eof those 2:14:1 phases show minor changes with the Nd content, while the hyperfine field Bhfincreases monotonically with increasing Nd content and its value is influenced by the element segregation and phase separation in the 2:14:1 phase. Then, the hyperfine structures of the low fraction secondary phases are determined by theFe M?ssbauer spectrometry due to its high sensitivity. On this basis,the content, magnetic behavior, and magnetization of the REFephase, the amorphous grain boundary(GB) phase, and the amorphous worm-like phase, as well as their effects on the magnetic properties, are systematically studied.

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Grain boundary construction and properties enhancement for hot deformed(Ce,La,Y)-Fe-B magnet by a two-step diffusion process

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Journal of Materials Science & Technology 2023年第34期165卷 253-261页

作者： Xuefeng Liao Weiwei Zeng Lizhong Zhao Qing Zhou Jiayi He Wei Li Xiangyi Liu Hongya Yu Xiaolian Liu Haoyang Jia jean-marc greneche Xuefeng Zhang Zhongwu Liu School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China Institute of Advanced Magnetic Materials College of Materials&Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310018China Guangdong Provincial Key Laboratory of Rare Earth Development and Application Institute of Resources Utilization and Rare Earth DevelopmentGuangdong Academy of SciencesGuangzhou 510640China School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China Institut des Molécules et Matériaux du Mans IMMM CNRS UMR-6283 Le Mans UniversitéAvenue MessiaenLe Mans F-72085Cedex 9France

The rare earth-iron-boron magnets based on high abundance rare earths(REs)show potential for costeffective permanent magnets but their hard magnetic properties have to be greatly *** grain boundary diffusion process(GBDP)is known as an effective way to improve the coercivity of Nd-Fe-B magnets,however,the conventional diffusion method faces a challenge for Ce-based magnets since there is no enough continuous GB layer as the diffusion ***,a two-step(Nd-Cu doping followed by Nd-Cu diffusion)GBDP was introduced for hot deformed(Ce,La,Y)-Fe-B magnet,and the excellent magnetic properties ofμ0Hc=0.63 T,μ0Mr=0.68 T,and(BH)max=72.4 kJ/m^(3)were *** Nd-Cu doping helps the formation of RE-rich GB layer,and then it acts as the diffusion channel for increasing the ef-ficiency of the subsequent Nd-Cu diffusion and results in the increased volume fraction of continuously distributed GB phase,whose paramagnetism was verified by 57Fe Mössbauer *** paramagnetic GB phases help to form the discontinuous domain walls,as observed by Lorentz transmission electron microscopy,and break the magnetic exchange coupling of RE2Fe14B *** thus contributes to the coercivity enhancement of the hot deformed magnet with two-step diffusion,which is further proved by micromagnetic *** study proposes a potential technique to prepare anisotropic hot deformed(Ce,La,Y)-Fe-B magnet with high cost-performance.

关键词： High abundance rare earth Hot deformed RE-Fe-B magnets Grain boundary diffusion process Magnetic properties Grain boundary phase

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Structure and collaboration relationship analysis in a scientific collaboration network

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Chinese Science Bulletin 2011年第34期56卷 3702-3706页

作者： HUI Zi CAI Xu greneche jean-marc WANG Qiuping Alexandre LUNAM Universite ISMANS 44 Ave. Bartholdi 72000 Le Mans France Complexity Science Center Institute of Particle Physics Central China Normal University Wuhan 430079 China LUNAM Universite Universite du Maine LPEC UMR CNRS 6087 72085 Le Mans France

We construct a weighted network of scientific collaboration in computational geometry and study the statistical properties of the network. In addition, we introduce a parameter called the collaboration relationship parameter to measure the collaboration between scientists. The collaboration relationship parameter of two scientists depends not only on the connection weights between the nodes, but also on the network's structure. The stability of the network's structure in terms of different edge removal strategies is also studied. According to the parameter, we find that a community structure exists in this type of network.

关键词：合作网络社会结构科学家协作关系合作关系计算几何统计特性参数调用

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Bound and Resonating Multiquark Configurations

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Chinese Physics Letters 2024年第8期41卷 8-12页

作者： jean-marc Richard Institut de Physique des 2 Infinis de Lyon Université Claude Bernard(Lyon 1) CNRS-IN2P34 rue Enrico Fermi69622 VilleurbanneFrance

We review the predictions of quark models for multiquark configurations that are bound or resonant states,and compare different methods for estimating the properties of resonances.

关键词： quark Configuration resonant

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Phase coexistence properties of liquid mercury:a simulation study

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Rare Metals 2006年第5期25卷 567-571页

作者： jean-Louis Bretonnet jean-marc Bomont Laboratoire de Physique des Milieux Denses Université Paul Verlaine1bd F.D.Arago57078 MetzCedex 3France

The thermophysical properties of expanded liquid mercury have been investigated along the liquid-vapor coexistence curve by using Monte Carlo and Molecular Dynamic simulations. For the purpose, an empirical state dependent interatomic potential for the region of dense metallic liquid is used, while the state dependence is not necessary near the cliffcal point. In order to test the validity of this potential, we determine the surface layering and the sound velocity, two properties very sensitive to the choice of the potential. Our results are in quite good agreement with other theoretical results and to the experimental data available in the literature.

关键词： mercury simulation phase coexistence liquid state

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Automatic Structure Determination of Organic Molecules: Principle and Implementation of the LSD Program

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Chinese Journal of Chemistry 2003年第10期21卷 1263-1267页

作者： NUZILLARD jean-marc Pharmacognosy Laboratory

The LSD (Logic for Structure Determination) program generates organicmolecular structures from 1D and 2D NMR data without resorting to chemical shift databases. Its usein the resolution of natural product structure determination problems has been already reported inthe literature. This paper describes how data and structures are internally represented andprocessed by LSD to build solution structures.

关键词： structure elucidation nuclear magnetic resonance correlation spectroscopy

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Generalized Backward Doubly Stochastic Differential Equations Driven by Lévy Processes with Continuous Coefficients

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Acta Mathematica Sinica,English Series 2012年第10期28卷 2011-2020页

作者： Auguste AMAN jean marc OWO UFR de Mathématiques et Informatique Université de Cocody

A new class of generalized backward doubly stochastic differential equations （GBDSDEs in short） driven by Teugels martingales associated with Levy process are investigated. We establish a comparison theorem which al... 详细信息

关键词： Backward doubly stochastic differential equations L@vy processes Teugels martingales comparison theorem continuous and linear growth conditions

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Wear Behavior of a Bio-inspired Bearing for off-center Loads

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Journal of Bionic Engineering 2020年第6期17卷 1251-1262页

作者： Delphine Sysaykeo jean-marc Linares Emmanuel Mermoz Alix-Marseile Universite CNRSCentre National de la Recherche ScientifiqueISMInstitut des Sciences du MouvementMarseille 13009France Advanced concepts and Dynamic systems architecture department Airbus HelicoptersAeroport International Marseille ProvenceMarignane 13700France

Misalignment is one of the most common causes of wear in bush *** improvements have been proposed by many ***,it did not efficiently reduce the *** geometrical designs sometimes reach their *** this reason,a bio-inspired design is proposed to solve the *** this article,a bio-inspired bearing suited to misalignment was tested and compared to a classical bush *** contact pressures of both bearings were compared with static Finite Element(FE)simulations for off-center *** to the complex shape of the involved contact,the performances of both bearings were also studied over *** wear behaviors were predicted with a numerical *** methodologies emplaced to simulate the wear were described in this ***,the wear coefficient determination obtained by experimental testing was *** pressure value,the contact zone and the wear depth were compared and *** wear results for the classical bearing are in accordance with the *** simulations show a deeper wear on the classical bush bearing than on the bio-inspired *** leads to a longer period of service life for the bio-inspired bearing.

关键词： biologically inspired design bush bearing wear simulation

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