检索结果-内蒙古大学图书馆

Dzyaloshinskii-Moriya interactions,Néel skyrmions and V_(4) magnetic clusters in multiferroic lacunar spinel GaV_(4)S_(8)

引用

npj Computational materials 2024年第1期10卷 2691-2700页

作者： Vladislav Borisov Nastaran Salehi Manuel Pereiro Anna Delin Olle Eriksson Department of Physics and Astronomy Uppsala UniversityBox 516SE-75120 UppsalaSweden Department of Applied Physics School of Engineering SciencesKTH Royal Institute of TechnologyAlbaNova University CenterSE-10691 StockholmSweden SeRC(Swedish e-Science Research Center) KTH Royal Institute of TechnologySE-10044 StockholmSweden Wallenberg Initiative Materials Science for Sustainability(WISE) KTH Royal Institute of TechnologySE-10044 StockholmSweden Wallenberg Initiative Materials Science for Sustainability Uppsala University75121 UppsalaSweden

Using ab initio density functional theory with static mean-field correlations,we calculate the Heisenberg and Dzyaloshinskii-Moriya interactions(DMI)for an atomistic spin Hamiltonian for the lacunar spinel,GaV_(4)S_(8).The parameters describing these interactions are used in atomistic spin dynamics and micromagnetic *** magnetic properties of the lacunar spinel GaV_(4)S_(8),a material well-known from experiment to hostmagnetic skyrmions of Néel character,are simulated with these ab initio calculated parameters.

关键词： parameters magnetic interactions

来源：评论

学校读者我要写书评

暂无评论

Microscopic origin and relevant grain size effect of discontinuous grain growth in BaTiO_(3)-based ferroelectric ceramics

引用

Journal of materials science & Technology 2023年第33期164卷 119-128页

作者： Hong Li Bo Wu Cong Lin Xiao Wu Tengfei Lin Min Gao Hong Tao Wenjuan Wu Chunlin Zhao College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China Physics Department Southwest Minzu UniversityChengdu 610041China Sichuan Province Key Laboratory of Information Materials and Devices Application Chengdu University of Information TechnologyChengdu 610225China

Barium titanate[BaTiO_(3)(BT)]-based ceramics are typical ferroelectric ***,the discontinuous grain growth(DGG)and relevant grain size effect are deeply *** obvious DGG phenomenon is observed in a paradigmatic Zr^(4+)-doped BT-based ceramic,with grains growing from∼2.2–6.6 to∼121.8–198.4μm discontinuously near 1320℃.It is found that fine grains can get together and grow into large ones with liquid phase surrounding them above eutectic *** the grain boundary density(D g)is quantitatively studied and shows a first-order reciprocal relationship with grain size,and the grain size effect is dependent on D *** grains lead to high D g,and then cause fine domains and pseudocubic-like phase structure because of the interrupted long-range ferroelectric orders by grain *** D g also causes the diffusion phase transition and low Curie dielectric peak due to the distribution of phase transition temperature induced by internal *** domain switching experiments reveal that the polarization orientation is more difficult near the grain boundary,implying that the grain boundary inhibition dominates the process of polarization orientation in fine-grain ceramics,which leads to low polarization but a high coercive ***,large-grain ceramics exhibit easy domain switching and high&similar *** work reveals that the grain boundary effect dominates the grain size effect in fine-grain ceramics,and expands current knowledge on DGG and grain size effect in polycrystalline materials.

关键词： BT-based ferroelectric ceramics Discontinuous grain growth Grain boundary density Grain size effect on structure/property Microscopic origin

来源：评论

学校读者我要写书评

暂无评论

3D/4D additive-subtractive manufacturing of heterogeneous ceramics

引用

Journal of materials science & Technology 2024年第34期201卷 210-221页

作者： Guo Liu Xinya Lu Xiaofeng Zhang Yan Zhao Shenghui Yi Jingjun Xu Yuqi Zhan Jianan Yin Chengcheng Feng Zhifeng Zhou Peiyu Wang Zhou Chen Yunhu He Siyao Chen Pengchao Liu Jun Zuo Yu Dai Jian Wu Sida Liu Jian Lu Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China CityU-Shenzhen Futian Research Institute Shenzhen 518045China Hong Kong Branch of National Precious Metals Material Engineering Research Center City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China National Engineering Laboratory for Modern Materials Surface Engineering Technology&The Key Lab of Guangdong for Modern Surface Engineering Technology Institute of New MaterialsGuangdong Academy of ScienceGuangzhou 510650China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Faculty of Materials Science Shenzhen MSU-BIT UniversityShenzhen 518100China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Physics and Materials Nanchang UniversityNanchang 330031China

The manufacturing of heterogeneous high-temperature material components is challenging for use in practical ***-dimensional(3D)printing provides solutions to programmable constructing ceramic ***,the development of heterogeneous ceramics is limited by low flexibil-ity of heterogeneity,geometrical complexity,structural resolution,manufacturing efficiency,and mate-rial *** this study,we demonstrated flexible and rapid approaches for fabricating complicated and precise heterogeneous ceramics by shape-changing(4D)or shape-keeping(3D)additive-subtractive manufacturing(ASM)*** shape-changing strategy for heterogeneous ceramics was achieved by global ceramization of heterogeneous precursors,while the shape-keeping strategy for heterogeneous ceramics was achieved by local receramization of homogeneous *** element analysis(FEA)simulations of the influence of the thermal shrinkage dominant in the shape-changing strategy on the shape deformation of heterogeneous ceramics could be valuable predictions of the experimental *** 3D/4D ASM methods are generic for high-temperature materials and extendable to metallic and dia-mond materials.

关键词： 3D/4D printing Additive-subtractive manufacturing Heterogeneous ceramics Elastomer-derived ceramics Local receramization

来源：评论

学校读者我要写书评

暂无评论

A multifunctional stealthy material for wireless sensing and active camouflage driven by configurable polarization

引用

Journal of materials science & Technology 2023年第1期132卷 42-49页

作者： Min Zhang Mao-Sheng Cao Qiang-Qiang Wang Xi-Xi Wang Wen-Qiang Cao Hui-Jing Yang Jie Yuan School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of Physics Beijing Technology and Business UniversityBeijing 100048China School of Electrical and Electronic Engineering Nanyang Technological University639798Singapore Department of Physics Tangshan Normal UniversityTangshan 063000China School of Information Engineering Minzu University of ChinaBeijing 100081China

The dipole species transformation and polarization relaxation configuration are achieved by changing the cobalt ion stoichiometry,which precisely tailors the electromagnetic attenuation performance of bismuth iron cobalt *** the stoichiometric ratio of Fe:Co is 19:1,the optimal reflection loss reaches-60 *** high electromagnetic attenuation performance significantly improve the linear sensitivity of the strain response and active customized stealth capability of the designed multifunctional capacitor-like ***,the wireless multifunctional design integrates energy attenuaten of electromagnetic wave with the wireless sensing and active camouflage functions for the first *** work provides an important step for the realization of electromagnetical multifunctional applications including electromag-netic protection and electromagnetic sensing in artificial beings,medical health and even space travel.

关键词： Electromagnetic absorption Polarization relaxation Electromagnetic sensing Active camouflage

来源：评论

学校读者我要写书评

暂无评论

Delicate topology of Luttinger semimetal

引用

Physical Review B 2024年第16期110卷 165120页

作者： Penghao Zhu Rui-Xing Zhang Department of Physics and Institute for Condensed Matter Theory Department of Physics and Astronomy Department of Materials Science and Engineering Institute of Advanced Materials and Manufacturing

Recent advances in delicate topology have expanded the classification of topological bands, but its presence in solid-state materials remains elusive. Here we show that delicate topology naturally emerges in the Luttinger-Kohn model that describes many semiconductors and semimetals. In particular, the Luttinger semimetal (LSM) is found to be a quantum critical point leading to a quantized jump of an integer-valued delicate topological invariant, i.e., the returning Thouless pump (RTP) index. Away from this criticality, we have identified new types of electronic insulators and semimetals with intertwined stable and delicate topologies. They all carry gapless surface states that transform anomalously under rotation symmetry. We further unveil that RTP physics widely exists in a large class of LSM-based Weyl materials that respect a rotoinversion symmetry, and we discuss their unconventional surface physics. Our work provides a starting point for exploring delicate topological phenomena in quantum materials.

关键词： Topological insulators Topological phases of matter Electronic structure Topological materials

来源：评论

学校读者我要写书评

暂无评论

Copper nitride films with high p-type conductivity fabricated by incorporating middle-frequency pulse into high power impulse magnetron sputtering

引用

Ceramics International 2025年第16期51卷 22793-22802页

作者： Wen, Chao-Kuang Joshi, Shikha Akshay Chen, Sheng-Chi Tsai, Chi-Jung Chan, Shang-Yu Sun, Hui Chiu, Te-Wei Department of Materials Engineering and Center for Plasma and Thin Film Technologies Ming Chi University of Technology Taipei243 Taiwan Department of Materials Engineering Indian Institute of Science Bangalore560012 India College of Engineering and Center for Green Technology Chang Gung University Taoyuan333 Taiwan Department of Materials and Mineral Resources Engineering National Taipei University of Technology No.1 Sec. 3 Zhongxiao E. Rd. Taipei106 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology No. 1 Sec. 3 Chung-Hsiao East Road Taipei106 Taiwan School of Space Science and Physics Shandong University Weihai264209 China

We report on the high deposition rate and conductivity of superimposed HiPIMS (HiPIMS + MF) p-type Cu3N films, including five sputtering modes: conventional DCMS, pure HiPIMS, HiPIMS + MF 3X, HiPIMS + MF 6X, and HiPIMS + MF 12X. A comparative analysis showed the significant impact of sputtering modes on various characterizations. The HiPIMS technique is an environmentally friendly process that supports sustainable manufacturing in line with Sustainable Development Goals (SDGs). The present study found that the degree of ionization of the sputtered copper (Cu) is 0.65 when using pure HiPIMS mode, which is the highest value compared to other sputtering modes. However, this mode also has the lowest deposition rate of 0.125 nm/s, which may limit its practical applications. In terms of higher deposition rate, the HiPIMS + MF surpasses both conventional DCMS and pure HiPIMS, further improved with an extended MF duration while preserving the high ionization rate. The HiPIMS + MF 3X mode is optimal for balancing the deposition rate and the degree of ionization, with values of 0.258 nm/s and 0.64, respectively. Specifically focused on the electrical properties of the Cu3N films, the HiPIMS + MF shows the higher carrier concentration of the films, leading to an increase in the film's conductivity due to a higher degree of ionization which can result in a higher ratio of Cu2+/Cu+ in the film and a large amount of Cu vacancies were formed. The optimal p-type conductivity for the HiPIMS + MF Cu3N films has been achieved using the HiPIMS + MF 3X mode. The resistivity, carrier concentration, and carrier mobility are 1.98 × 10−2 Ω cm, 8.18 × 1020 cm−3 and 0.386 cm2V−1s−1, respectively. These findings boost the prospects of using Cu3N films in advanced future technologies, including photodetection, photovoltaic absorbers, lithium-ion batteries, and more. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Deposition rates

来源：评论

学校读者我要写书评

暂无评论

Dual modifications of sensitizers and lanthanide ions on a two-dimensional zirconium-based metal-organic framework for photoluminescent detection

引用

CrystEngComm 2024年第22期26卷 2852-2861页

作者： Chang, Jhe-Wei Lin, Tzu-Chi Chen, You-Liang Han, Po-Chun Yang, Shang-Cheng Tsai, Meng-Dian Wu, Kevin C.-W. Kung, Chung-Wei Department of Chemical Engineering National Cheng Kung University Tainan City70101 Taiwan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Ph. D. Program of Green Materials and Precision Devices College of Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taoyuan320 Taiwan

A two-dimensional (2D) zirconium-based metal-organic framework (Zr-MOF) with abundant terminal -OH/-OH2 groups on its nodes, ZrBTB (BTB = 1,3,5-tris(4-carboxyphenyl)benzene), is utilized as a platform for dual post-synthetic modifications (PSM) to immobilize both the benzophenone-based photosensitizer (benzophenone-4,4′-dicarboxylate, bzpdc) and terbium ions onto the 2D Zr-MOF molecular sheets. Terbium ions are installed on the 2D Zr-MOF at various temperatures to adjust the loading of terbium ions on the 2D Zr-MOF while preserving the loading of the photosensitizer. The crystallinity, morphology, porosity, and loadings of both bzpdc ligands and terbium ions are characterized for each material, and the coordinating locations of terbium ions in the Zr-MOF structure are investigated. The photoluminescence (PL) properties of these materials are then examined. Since the installed bzpdc ligand can induce a highly efficient energy transfer to the neighbouring terbium ion upon excitation, the obtained material after dual PSM (ZrBTB-bzpdc-Tb-120) can show strong PL emissions of terbium ions upon the excitation of the bzpdc ligand at 355 nm, with a PL quantum yield of 5.04%. It is more advantageous than the 2D Zr-MOF solely functionalized with terbium ions, which can only exhibit similar emissions upon the excitation of the BTB linker at a less friendly wavelength of 310 nm, with a lower PL quantum yield of 2.94%. Owing to the high chemical stability as well as good dispersity of the luminescent ZrBTB-bzpdc-Tb-120 in water, its performances in selective PL sensing of Fe(iii) ions present in aqueous solutions are investigated. © 2024 The Royal Society of Chemistry.

关键词： Carboxylation

来源：评论

学校读者我要写书评

暂无评论

Electrodeposition of self-supported NiMo amorphous coating as an efficient and stable catalyst for hydrogen evolution reaction

引用

Rare Metals 2022年第8期41卷 2624-2632页

作者： Fu-Hang Yuan Mohammad-Reza Mohammadi Li-Li Ma Zhen-Duo Cui Sheng-Li Zhu Zhao-Yang Li Shui-Lin Wu Hui Jiang Yan-Qin Liang School of Materials Science and Engineering Tianjin UniversityTianjin300072China Department of Physics University of Sistan and BaluchestanZahedan98167-45845Iran

NiMo-based materials have been identified as potential candidates of Pt/C electrocatalysts for hydrogen evolution reaction(HER)due to appropriate binding energy to hydrogen,and good resistance to corrosive ***,little work has been carried out to enhance the catalytic performance in large-scale water-alkali *** NoMo amorphous coating,as a highefficient and cost-effective catalyst toward HER,was synthesized by a facile electrodeposition strategy in this *** effects of the pH value of electrolyte on the structure and HER activity of NiMo coating were *** as-prepared NiMo_((pH10))exhibited the highest HER activity with overpotentials of 63.9 and 157.1 mV(***,with 80%potential drop due to electrical resistance(iR)compensation)at the current density of-10 mA·cm^(-2)and-100 mA·cm^(-2).This NiMo_((pH10))coating also had excellent long-term durability of up to100 h stable operation under the constant current density of-100 mA·cm^(-2).The rapid HER kinetics and outstanding endurance can be ascribed to the NiMo compact coating with amorphous structures as well as good contact between NiMo coating and Ni foam substrate,endowing it grand feasibility in practical industrial applications.

关键词： Electrodeposition NiMo coating Hydrogen evolution reaction(HER) Alkaline water electrolysis

来源：评论

学校读者我要写书评

暂无评论

Unleashing the Power of Bio-based Thermotropic Liquid Crystal Modifiers:Toughening and Reinforcing Petroleum-based Epoxy Resin without Compromising Other Properties

引用

Chinese Journal of Polymer science 2024年第8期42卷 1093-1102页

作者： Qing-Yun Lu Hong-Wei Gu Jia-Hui Li Qian-Qian Fan Bei-Tao Liu Yan Kou Xi-Gao Jian Zhi-Huan Weng State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart MaterialsLiaoning Technology Innovation Center of High Performance Resin MaterialsDepartment of Polymer Science&EngineeringDalian University of TechnologyDalian 116024China Thermochemistry Laboratory Liaoning Province Key Laboratory of Thermochemistry for Energy and MaterialsDalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Toughening the petroleum-based epoxy resin blends with bio-based modifiers without compromising their modulus,mechanical strength,and other properties is still a big challenge in view of the *** this study,a bio-based liquid crystal epoxy resin(THMT-E P)with an s-triazine ring structure was utilized to modify a petroleum-based bisphenol A epoxy resin(E51)with 4,4'-diaminodiphenylsulfone(DDS)as a curing agent,and the blended systems were evaluated for their thermal stability,mechanical properties,and flame *** results showed that the impact strength of the blended system initially increased and then decreased with the increase in THMT-EP content,and it reached the a maximum value of 26.5 kJ/m^(2)when the THMT-EP content was 5%,which was 31.2%higher than that of E51/***,the flexural strength,modulus,and glass transition tem perature of the blended system were all simultaneously improved with the addition of *** the same time,the addition of THMT-EP enhanced the flame retardancy of the system by increasing the char yield at 700℃and decreasing the peak heat release rate and total heat release *** work paves the way for a more sustainable improvement in the comprehensive performance of epoxy resin.

关键词： Epoxy resin Toughening Bio-based Thermotropic liquid crystal

来源：评论

学校读者我要写书评

暂无评论

Research perspective and prospective of additive manufacturing of biodegradable magnesium-based materials

引用

Journal of Magnesium and Alloys 2023年第5期11卷 1485-1504页

作者： Qingyun Fu Wenqi Liang Jiaxin Huang Weihong Jin Baisong Guo Ping Li Shulan Xu Paul K.Chu Zhentao Yu Center of Oral Implantology Stomatological HospitalSouthern Medical UniversityGuangzhou 510280China Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632China Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina

Biodegradable metals such as magnesium(Mg)and its alloys have attracted extensive attention in biomedical research due to their excellent mechanical properties and ***,traditional casting,extrusion,and commercial processing have limitations in manufacturing components with a complex shape/structure,and these processes may produce defects such as cavities and gas pores which can degrade the properties and usefulness of the *** to conventional techniques,additive manufacturing(AM)can be used to precisely control the geometry of workpieces made of different Mg-based materials with multiple geometric scales and produce desirable medical products for orthopedics,dentistry,and other ***,a detailed and thorough understanding of the raw materials,manufacturing processes,properties,and applications is required to foster the production of commercial Mg-based biomedical components by *** review summarizes recent advances and important issues pertaining to AM of Mg-based biomedical products and discusses future development and application trends.

关键词： Magnesium-based materials Additive manufacturing Wires and powders Biomedical metallic materials Medical devices

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：