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Ion compaction effect in hollow FePt nanochains with ultrathin shell under low energy ion irradiation

Nano Research 2022年第10期15卷 9309-9318页

作者： Jialong Liu Jianguo Wu Long Cheng Suyun Niu Zhiqiang wang Mengyuan Zhu Jingyan Zhang shouguo wang Wei wang School of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Shale Gas and Engineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China School of Physics Beihang UniversityBeijing 100029China Beijing Hangxing Machinery Manufacturing Co. Ltd.Beijing 100013China Beijing Smart-chip Microelectronics Technology Co. Ltd.Beijing 100192China Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

The morphology manipulation of nanomaterials by ion irradiation builds a way to precisely control physicochemical *** the continuous irradiation of low energy Ga+,Ne+,and He+ions,an ion compaction effect has been found in hollow FePt nanochains with ultrathin shell that the volumes of the nanochains are gradually compacted by *** deep learning algorithm has been successfully applied to automatically and precisely measure average sizes of spheres in hollow FePt *** compaction under ion irradiation is very fast in the very early period and then proceeds to a slow *** compaction rates in both regions are linearly fitted and all the values are in the order of 10^(–17) to 10^(–14) cm^(2)/*** species and ion current have effect on the compaction *** example,the compaction rate of Ga+ions is larger than those of Ne+and He+ions under an identical current,while irradiation with larger current can compact nanochains *** ion compaction effect originates from the local shear deformation caused by the interaction between incident ions and the electrons of Fe and Pt atoms in the ultrathin *** continuous irradiation,the crystalline clusters of FePt nanchains firstly grow larger and then become *** ion compaction effect can be applied to tune the size and crystal structure of hollow structures with a precise rate by choosing appropriate ion species and current.

关键词： ion compaction effect hollow structure ion irradiation FePt

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Antiferromagnetic element Mn modified PtCo truncated octahedral nanoparticles with enhanced activity and durability for direct methanol fuel cells

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Nano Research 2019年第10期12卷 2520-2527页

作者： Qiqi Zhang Jialong Liu Tianyu Xia Jie Qi Haochang Lyu Baoyuan Luo Rongming wang Yizhong Guo Lihua wang and shouguo wang Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China Key Laboratory of Material Physics of Ministry of Education School of Physics and EngineeringZhengzhou UniversityZhengzhou 450052China Institute far multidisciplinary Innovation University of Science and Technology BeijingBeijing 100083China Beijng Key Lab cf Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100124China

Pt-based magnetic nano catalysts are one of the most suitable cand idates for electrocatalytic materials due to their high electrochemistry activity and ***,the inferior durability prevents them from being scaled-up,limiting their commercial ***,an antiferromagnetic element Mn was introduced into PtCo nanostructured alloy to synthesize uniform Mn-PtCo truncated octahedral nanoparticles(TONPs)by one-pot *** results show that Mn can tune the blocking temperature of Mn-PtCo TONPs due to its an tiferromag *** low temperatures,Mn-PtCo TONPs are ferromag netic,and the coercivity in creases gradually with in creasi ng Mn *** room temperature,the Mn-PtCo TONPs display superparamag netic behavior,which is greatly helpful for in dustrial *** doping can not only modify the electronic structure of PtCo TONPs but also enhanee electrocatalytic performance for methanol oxidation *** maximum specific activity of Mn-PtCo-3 reaches 8.1 A`m^-2,3.6 times of commercial Pt/C(2.2 A·m^-2)and 1.4 times of PtCo TONPs(5.6 A`m^-2),*** mass activity decreases by only 30%after 2,000 cycles,while it is 45%and 99%(nearly inactive)for PtCo TONPs and commercial Pt/C catalysts,respectively.

关键词： Mn-PtCo trun cated octahedral nano particles an tiferromag netic eleme nt magnetic properties electrocatalytic performa nee

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Carrier-Density-Determined Magnetoresistance in Semimetal SrIrO_(3)

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Chinese Physics Letters 2024年第10期41卷 90-96页

作者： Liang Yang Biao Wu Xin Liu Mingyu wang Congli He shouguo wang Jinxing Zhang School of Physics and Astronomy Beijing Normal UniversityBeijing 100875China Key Laboratory of Multiscale Spin Physics(Ministry of Education) Beijing Normal UniversityBeijing 100875China SwissFEL Paul Scherrer InstituteVilligen PSI 5232Switzerland Anhui Key Laboratory of Magnetic Functional Materials and Devices School of Materials Science and EngineeringAnhui UniversityHefei 230601China

SrIrO_(3),a Dirac material with a strong spin-orbit coupling(SOC),is a platform for studying topological properties in strongly correlated systems,where its band structure can be modulated by multiple factors,such as crystal symmetry,elements doping,oxygen vacancies,magnetic field,and ***,we find that the engineered carrier density plays a critical role on the magnetoelectric transport properties of the topological semimetal SrIrO_(3).The decrease of carrier density subdues the weak localization and the associated negative magnetoresistance,while enhancing the SOC-induced weak ***,the sample with the lowest carrier density exhibits high-field positive magnetoresistance,suggesting the presence of a Dirac *** addition,the anisotropic magnetoresistance indicates the anisotropy of the electronic structure near the Fermi *** engineering of carrier density provides a general strategy to control the Fermi surface and electronic structure in topological materials.

关键词： temperature materials topological

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Greatly Enhanced Methanol Oxidation Reaction of CoPt Truncated Octahedral Nanoparticles by External Magnetic Fields

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Energy & Environmental Materials 2023年第5期6卷 201-210页

作者： Mengyuan Zhu Yi wang Yanfei Wu Jialong Liu Jingyan Zhang He Huang Xinqi Zheng Jianxin Shen Ruijie Zhao Wenda Zhou shouguo wang Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Department of Physics and Electronics School of Mathematics and PhysicsBeijing University of Chemical TechnologyBeijing 100029China

Tunable behavior in electrocatalysis by external multifields,such as magnetic field,thermal field,and electric field,is the most promising strategy to expand the theory,design,and synthesis of state-of-the-art catalysts and the cell in the near ***,a systematic investigation for the effect of external magnetic field and thermal field on methanol oxidation reactions(MOR)in magnetic nanoparticles is *** Co_(42)Pt_(58)truncated octahedral nanoparticles(TONPs),the catalytic performance in MOR is greatly increased to the maximum of 14.1%by applying a magnetic field up to 3000 Oe,and it shows a monotonical increase with increasing working *** magnetic enhanced effect is closely related to the Co content of Co_(x)Pt_(100-x)***,the enhancement effect under a magnetic field is more obvious for Co_(42)Pt_(58)TONPs annealed at 650℃.First-principle calculation points out that the magnetic fields can facilitate the dehydrogenation of both methanol and water by suppression of entropy of the electron spin and lowering of the activation barrier,where OH_(ad)intermediates on Co sites play a more important *** application of magnetic fields together with thermal fields in MOR provides a new prospect to manipulate the performance of direct methanol fuel cells,which will accelerate their potential applications.

关键词： external magnetic fields first-principle calculation methanol oxidation reaction Pt-based magnetic nanomaterials

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A new method to enhance the magnetocaloric effect in (Sc,Ti)Fe_(2) via magnetic phase separation

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Journal of Materials Science & Technology 2023年第16期147卷 102-111页

作者： Yuzhu Song Meng Xu Xinqi Zheng Chang Zhou Naike Shi Qingzhen Huang shouguo wang Yong Jiang Xianran Xing Jun Chen Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China NIST Center for Neutron Research National Institute of Standards and TechnologyGaithersburg MD20899-6102United States

Magnetic refrigeration based on the magnetocaloric effect(MCE)is a novel refrigeration technology that will replace traditional vapor-compression refrigeration in the *** in the performance of MCE materials is crucial for the development of magnetic refrigeration *** study presents a new method that enhances the MCE performance of(Sc,Ti)Fe_(2) via magnetic phase *** maximum magnetic entropy change induced by the coexistence of an in-plane ferromagnetic phase(FMab)and a canting antiferromagnetic phase(CAFM)in Sc_(0.3)Ti_(0.7)Fe_(2) is twice that found in other(Sc,Ti)Fe_(2 )***-temperature neutron diffraction experiments directly reveal that the large magnetic entropy change in Sc_(0.3)Ti_(0.7)Fe_(2) is dominated by the transformation from a highly ordered FMab state to a CAFM state with a lower magnetic *** magnetic phase separation is a direct transition from a higher-ordered state with a larger lattice to a lower-ordered state with a smaller lattice that induces a large magnetic order change and lattice *** combination of the metamagnetic transition and negative thermal expansion leads to enhanced *** study suggests the possibility that magnetic phase separation can be an effective approach to achieving and controlling a large MCE in magnetic materials.

关键词： Magnetocaloric effect Neutron diffraction Magnetic structure

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Giant low-field magnetocaloric effect in ferromagnetically ordered Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds

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Journal of Materials Science & Technology 2023年第15期146卷 168-176页

作者： Shuxian Yang Xinqi Zheng Dingsong wang Juping Xu Wen Yin Lei Xi Chaofan Liu Jun Liu Jiawang Xu Hu Zhang Zhiyi Xu Lichen wang Yihong Yao Maosen Zhang Yichi Zhang Jianxin Shen shouguo wang Baogen Shen School of Materials Science and Engineering Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences&University of Chinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China School of Materials Science and Engineering Anhui UniversityHefei 230601China Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China Songshan Lake Materials Laboratory Dongguan 523808China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China

Magnetocaloric material is the key working substance for magnetic refrigerant technology,for which the low-field and low-temperature magnetocaloric effect(MCE)performance is of great importance for practical applications at low ***,a giant low-field magnetocaloric effect in ferromagnetically ordered Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds was reported,and the magnetic structure was characterized based on low-temperature neutron powder *** increasing Tm content from 0 to 1,the Curie temperature of Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds decreases from 16.0 K to 3.6 *** Er_(0.7)Tm_(0.3)Al_(2) compound,it showed the largest low-field magnetic entropy change(–SM)with the peak value of 17.2 and 25.7 J/(kg K)for 0–1 T and 0–2 T,***(–SM)max up to 17.2 J/(kg K)of Er0.7Tm0.3Al2 compound for 0–1 T is the largest among the intermetallic magnetocaloric materials ever reported at temperatures below 20 *** peak value of adiabatic temperature change(Tad)max was determined as 4.13 K and 6.87 K for 0–1 T and 0–2 T,*** characteristic of second-order magnetic transitions was confirmed on basis of Arrott plots,the quantitative criterion of exponent n,rescaled universal curves,and the mean-field theory *** outstanding low-field MCE performance with low working temperatures indicates that Er_(1-x)Tm_(x)Al_(2)(0≤x≤1)compounds are promising candidates for magnetic cooling materials at liquid hydrogen and liquid helium temperatures.

关键词： Magnetocaloric effect Low field magnetocaloric effect Magnetic structure RAl_(2)compounds

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Nanomagnetic CoPt truncated octahedrons:facile synthesis,superior electrocatalytic activity and stability for methanol oxidation

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Science China Materials 2017年第1期60卷 57-67页

作者： Tianyu Xia Jialong Liu shouguo wang Chao wang Young Sun Rongming wang University of Science and Technology Beijing Beijing 100083 China Department of Physics Beihang University Beijing 100191 China State Key Laboratory of Magnetism Institute of Physics Chinese Academy of Sciences （CAS） Beijing 100190 China

Nanomagnetic CoPt truncated octahedral nanoparticles （TONPs） were successfully synthesised through a facile one-pot strategy. These single crystal CoPt TONPs with an average size of about 8 nm exhibit excellent electrocatalytic performance of both activity and stability for methanol oxidation reaction （MOR）. The mass and specific activities of CoPt TONPs is 8 and 6 times higher than that of standard commercial Pt/C, respectively. After accelerated durability test （ADT）, the loss of electrochemical surface area （ECSA） for CoPt TONPs is only 18.5%, which is significantly less than that of commercial Pt/C （68.2%）, indicating that CoPt TONPs possess much better stability than commercial Pt/C in the prolonged operation. The Curie temperature of CoPt TONPs down to 8 nm is as high as 350 K with weak ferromagntism at room temperature （RT）, which is greatly valuable for recycling in the eletrocatalytic applications.

关键词： truncated octahedral nanoparticles methanol oxida-tion reaction (MOR) accelerated durability test (ADT) ferro-magntism

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Enhanced spin–orbit torque efficiency in Pt100−xNix alloy based magnetic bilayer

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Chinese Physics B 2021年第3期30卷 100-104页

作者： Congli He Qingqiang Chen Shipeng Shen Jinwu Wei Hongjun Xu Yunchi Zhao Guoqiang Yu shouguo wang Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The binary alloy/ferromagnetic metal heterostructure has drawn extensive attention in the research field of spin–orbittorque(SOT)due to the potential enhancement of SOT efficiency via composition *** this work,the magneticproperties and SOT efficiency in the Pt100−xNix/Ni78Fe22 bilayers were investigated via the spin-torque ferromagneticresonance(ST-FMR)*** effective magnetic anisotropy field and effective damping constant extracted by analyzing the ST-FMR spectra show a weak dependence on the Ni *** effective spin-mixing conductanceof 8.40×10^(14)Ω−1·m−2and the interfacial spin transparency Tin of 0.59 were obtained for the sample of Pt70Ni30/*** interestingly,the SOT efficiency that is carefully extracted from the angular dependence of ST-FMR spectrashows a nonmonotonic dependence on the Ni concentration,which reaches the maximum at x=*** enhancement ofthe SOT efficiency by alloying the Ni with Pt shows potential in lowering the critical switching ***,alloyingrelatively cheaper Ni with Pt may promote to reduce the cost of SOT devices.

关键词： spin-orbit torque magnetic doping spin-torque ferromagnetic resonance

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地面激光扫描仪鉴别率检定方法的研究

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测绘通报 2011年第6期 45-47页

作者：王守国天津海事局海测大队天津300220

首先区分鉴别率与分辨率的相互关系,在此基础上研究地面激光扫描仪鉴别率的检定设备、检定方法。研究结果可为我国地面激光扫描仪检定规程的制定提供参考。

关键词：地面激光扫描仪鉴别率鉴别率检定板检定方法

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论品牌经济时代主流都市报的发展战略——以《大河报》为例

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中州学刊 2006年第2期 255-258页

作者：王守国河南日报报业集团大河报社河南郑州450008

品牌经济时代的主流都市报,在经历了10余年的高速发展之后,从办报宗旨到经营方略都有了许多重大改变。在办报宗旨方面,强调品牌建设,保持品牌的主流地位:一是关注时政新闻,提升公信力;二是注重理性建设性,引领社会秩序的构建;三是增加... 详细信息

品牌经济时代的主流都市报,在经历了10余年的高速发展之后,从办报宗旨到经营方略都有了许多重大改变。在办报宗旨方面,强调品牌建设,保持品牌的主流地位:一是关注时政新闻,提升公信力;二是注重理性建设性,引领社会秩序的构建;三是增加文化含量,提升报纸品位;四是直面重大问题,发挥引导作用。在经营方略方面,强调经营品牌,保持品牌的活力和持续成长:一是突破体制束缚,焕发新的激情与活力;二是扩展经营范围,增强抗御风险的能力;三是积极探索与网络等新兴媒体竞争与合作的路径。

关键词：品牌经济主流都市报发展战略

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