检索结果-内蒙古大学图书馆

Structure evolution andτ_(f)influence mechanism of Bi_(1-x)Ho_(x)VO_(4)microwave dielectric ceramics for LTCC applications

引用

Journal of materials Science & Technology 2024年第30期197卷 1-8页

作者： Huaicheng Xiang Yuheng Zhang Junqi Chen Yang Zhou Ying Tang Jinwu Chen Liang Fang Key Laboratory of Low-Dimensional Structural Physics and Application Education Department of Guangxi Zhuang Autonomous RegionCollege of Physics and Electronic Information EngineeringGuilin University of TechnologyGuilin541004China Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices Guangxi Key Laboratory of Optical and Electronic Materials and DevicesCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin541004China School of Mechanical Engineering Guilin University of Aerospace TechnologyGuilin541004China

Bi_(1-x)Ho_(x)VO_(4)(0.1≤x≤0.9)ceramics were prepared via a solid-state reaction method,and all the ceram-ics could be well densified in the 920–980℃*** ceramics with 0.1≤x<0.4 were composed of both monoclinic scheelite(M)and tetragonal zircon(T)phases,and a single M phase could be obtained in the range of x≥*** measuredε_(r) decreased from 58.9(x=0.1)to 14.7(x=0.9),so do the calcu-lated values(ε_(r)(C−M)=34.3–12.1),and the main reason forε_(r)>ε_(r)(C−M)was the rattling of Ho^(3+)in the *** points with zeroτf appeared in Bi1–x Hox VO4(0≤x≤1)ceramics,and the best mi-crowave dielectric properties withε_(r)=16.6,Q×f=18,400 GHz(f=10.69 GHz),andτf=+3.29 ppm/℃were obtained in the Bi_(0.2)Ho_(0.8)VO_(4)*** change in temperature coefficient of ionic polarizability(τ_(αm))caused by the rattling effect of cations is the physical essence that affectsτ***,the rattling effect can be used as an effective mechanism to regulateτf in low-ε_(r) ***,there was no chemical reaction between Bi_(1-x)Ho_(x)VO_(4) and Ag electrode,which indicates potential applications in low-temperature co-fired ceramic(LTCC)technology.

关键词： Bi_(1–x)Ho_(x)VO_(4) Near-zeroτ_(f) Bond valence Rattling effect LTCC

来源：评论

学校读者我要写书评

暂无评论

Universal basis underlying temperature, pressure and size induced dynamical evolution in metallic glass-forming liquids

引用

Chinese Physics B 2024年第1期33卷 134-142页

作者：张华平范蓓蓓吴佳琦李茂枝 Department of Physics Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano DevicesRenmin University of ChinaBeijing 100872China Songshan Lake Materials Laboratory Dongguan 523808China Key Laboratory of Quantum State Construction and Manipulation Renmin University of ChinaBeijing 100872China

The dramatic temperature-dependence of liquids dynamics has attracted considerable scientific interests and efforts in the past decades, but the physics of which remains elusive. In addition to temperature, some other parameters, such as pressure, loading and size, can also tune the liquid dynamics and induce glass transition, which makes the situation more complicated. Here, we performed molecular dynamics simulations for Ni_(50)Zr_(50) bulk liquid and nanodroplet to study the dynamics evolution in the complex multivariate phase space, especially along the isotherm with the change of pressure or droplet size. It is found that the short-time Debye–Waller factor universally determines the long-time relaxation dynamics no matter how the temperature, pressure or size changes. The basic correlation even holds at the local atomic scale. This finding provides general understanding of the microscopic mechanism of dynamic arrest and dynamic heterogeneity.

关键词： metallic glass-forming liquids structure relaxation dynamical heterogeneity Debye–Waller factor

来源：评论

学校读者我要写书评

暂无评论

A Liquid–Solid Interface-Based Triboelectric Tactile Sensor with Ultrahigh Sensitivity of 21.48 kPa-1

引用

Nano-Micro Letters 2022年第6期14卷 28-38页

作者： Jingya Liu Zhen Wen Hao Lei Zhenqiu Gao Xuhui Sun Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123People’s Republic of China

Traditional triboelectric tactile sensors based on solid–solid interface have illustrated promising application prospects through optimization ***,the poor sensitivity and reliability caused by hard contact-electrification still poses challenges for the practical *** this work,a liquid–solid interface ferrofluid-based triboelectric tactile sensor(FTTS)with ultrahigh sensitivity is *** on the fluidity and magnetism of ferrofluid,the topography of microstructure can be flexibly adjusted by directly employing ferrofluid as triboelectric material and controlling the position of outward *** date,an ultrahigh sensitivity of 21.48 k Pa;for the triboelectric sensors can be achieved due to the high spike microstructure,low Young’s modulus of ferrofluid and efficient solid–liquid interface *** detection limit of FTTS of 1.25 Pa with a wide detection range to 390 k Pa was also *** addition,the oleophobic property between ferrofluid and poly-tetra-fluoro-ethylene triboelectric layer can greatly reduce the wear and tear,resulting in the great improvement of ***,a strategy for personalized password lock with high security level has been demonstrated,illustrating a great perspective for practical application in smart home,artificial intelligence,Internet of things,etc.

关键词： Ferrofluid Tactile sensor Triboelectric nanogenerator Microstructure Ultrahigh sensitivity

来源：评论

学校读者我要写书评

暂无评论

Efficient Perovskite Quantum Dots Light-emitting Diodes:Challenges and Optimization

引用

发光学报 2025年第3期46卷 452-461页

作者： LI Mengjiao WANG Ye WANG Yakun LIAO Liangsheng Key Laboratory for Carbon-based Functional Materials&Devices Institute of Functional Nano&Soft MaterialsSoochow UniversitySuzhou 215123China

Perovskite quantum dot light-emitting diodes(Pe-QLEDs)have shown immense application potential in display and lighting fields due to their narrow full-width at half maximum(FWHM)and high photoluminescence quantum yield(PLQY).Despite significant advancements in their performance,challenges such as defects and ion migration still hinder their long-term stability and operational *** address these issues,various optimization strategies,including ligand engineering,interface passivation,and self-assembly strategy,are being actively *** review focuses on the synthesis methods,challenges and optimization of perovskite quantum dots,which are critical for the commercialization and large-scale production of high-performance and stable Pe-QLEDs.

关键词： perovskite quantum dot light-emitting diodes(Pe-QLEDs) photoluminescence defects ion migration

来源：评论

学校读者我要写书评

暂无评论

Suppressed concentration quenching and tunable photoluminescence in Eu^(2+)-activated Rb_(3)Y(PO_(4))_(2) phosphors for full-spectrum lighting

引用

Light(Science & Applications) 2024年第11期13卷 2688-2698页

作者： Ming Zhao Yeping Ge Yurong Li Xiaoyan Song Zhiguo Xia Xinping Zhang Institute of Information Photonics Technology School of Physics and Optoelectronic EngineeringBeijing University of TechnologyBeijing 10083China College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaBeijing University of TechnologyBeijing 10083China State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSchool of Physics and OptoelectronicsSouth China University of TechnologyGuangzhou 510641China

Highly efficient inorganic phosphors are desirable for lighting-emitting diode light sources,and increasing the doping concentration of activators is a common approach for enhancing the photoluminescence quantum yield(PLQY).However,the constraint of concentration quenching poses a great challenge for improving the ***,we propose a fundamental design principle by separating activators and prolonging their distance in Eu^(2+)-activated Rb_(3)Y(PO_(4))_(2)phosphors to inhibit concentration quenching,in which different quenching rates are controlled by the Eu distribution at various crystallographic *** blue-violet-emitting Rb_(3)Y(PO_(4))2:xEu(x=0.1%–15%)phosphors,with the occupation of Rb1,Rb2 and Y sites by Eu^(2+),exhibit rapid luminescence quenching with optimum external PLQY of 10%due to multi-channel energy ***,as the Eu concentration increases above 20%,Eu^(2+)prefer to occupy the Rb1 and Y sites with separated polyhedra and large interionic distances,resulting in green emission with suppressed concentration quenching,achieving an improved external PLQY of 41%.Our study provides a unique design perspective for elevating the efficiency of Eu^(2+)-activated phosphors toward high-performance inorganic luminescent materials for full-spectrum lighting.

关键词： quenching lighting concentration

来源：评论

学校读者我要写书评

暂无评论

Conformational isomerization:A novel mechanism to realize the AIE-TADF behaviors

Aggregate

引用

Aggregate 2023年第1期4卷 260-267页

作者： Hao Wu Xiao-Chun Fan Hui Wang Feng Huang Xin Xiong Yi-Zhong Shi Kai Wang Jia Yu Xiao-Hong Zhang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhouJiangsuPR China Research Center for Green Printing Nanophotonic Materials Jiangsu Key Laboratory for Environmental Functional MaterialsSchool of Materials Science and EngineeringSuzhou University of Science and TechnologySuzhouPR China

Thermally activated delayed fluorescence(TADF)materials with aggregationinduced emission(AIE)features can overcome aggregation-caused quenching(ACQ)and emit intensely in aggregate states and thus have attracted enormous attention in the fields of high-efficiency organic light-emitting diodes,bioimaging,photodynamic therapy,photocatalysis,***,their corresponding exact working mechanisms at the microscopic level are still far from ***,by carefully investigating the physical properties of our newly designed TADF material 6-(10H-spiro[acridine-9,9′-fluoren]-10-yl)nicotinonitrile in various states,we concluded that conformational isomerization plays an important role in realizing high photoluminescence quantum yields in its amorphous neat film state,in which the high-lying quasi-axial conformations with non-TADF features and low-lying quasiequal conformations with TADF characteristics serve as the host matrix and dopant,respectively,thus suppressing ACQ in disordered aggregate *** work not only offers a new possible microscopic mechanism by using conformational isomerization for the AIE-TADF phenomenon but also provides a novel method for designing high-efficiency AIE-TADF emitters.

关键词： aggregation-induced emission conformational isomerization microscopic mechanism thermally activated delayed fluorescence

来源：评论

学校读者我要写书评

暂无评论

Dative B–N bonds weaven toward two-dimensional purely organic materials for single crystals

引用

Science China Chemistry 2025年第1期68卷 12-14页

作者： Wei-Lei Zhou Siwei Wang Yong Chen College of Chemistry and Materials Science Inner Mongolia Key Laboratory of Chemistry for Nature Products and Synthesis for Functional MoleculesInnovation Team of Optical Functional Molecular DevicesInner Mongolia Minzu UniversityTongliao 028000China College of Chemistry Nankai UniversityTianjin 300071China

Molecular topology is one of the important topics to study and understand the relationship between molecular structure and properties^([1]).Particularly,two-dimensional(2D)materials with extremely high surface area and ultra-thin morphology have attracted considerable attention due to their unexpected properties in materials and chemistry^([2,3]).

关键词： bonds purely dimensional

来源：评论

学校读者我要写书评

暂无评论

Electrochemically activated metal oxide sites at Rh-Ni2P electrocatalyst for efficient alkaline hydrogen evolution reaction

引用

Rare Metals 2024年第12期43卷 6416-6425页

作者： Cheng Peng Jia-Yi Li Luo-Xiang Shi Ming-Yue Wang Wen-Hai Wang Tao Cheng Pei-Zhi Yang Hao Yang Kong-Lin Wu Institute of Clean Energy and Advanced Nanocatalysis(iClean) School of Chemistry and Chemical EngineeringAnhui University of TechnologyMaanshan243002China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou215123China Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials Ministry of EducationYunnan Normal UniversityKunming650500China

Highly efficient hydrogen evolution reaction(HER)electrocatalysts play a crucial part in generating green ***,an electrochemical activation approach was applied to design 6.7 Rh-Ni_(2)P-800CV electrocatalysts in alkaline *** results confirm that the generation of metal oxide sites through the electrochemical activation strategy can effectively improve the intrinsic activity of 6.7 Rh-Ni_(2)*** density functional calculations further confirm that metal oxide active sites are favorable for H2O adsorption and activation and H*adsorption/*** 6.7 Rh-Ni_(2)P-800CV possesses significantly enhanced HER performance with low overpotential(25 mV at 10 mA·cm^(2)),small Tafel(60 mV·dec^(-1))and robust stability in 1.0 M KOH,outperforming Pt/C and 6.7 Rh-Ni_(2)P ***,6.7 Rh-Ni_(2)P-800CV can even operate at a large current density(550 mA·cm^(-2))up to 90 h with an overpotential of 320 mV,which meets the requirements of industrial water ***'s more,the overall watersplitting systems(6.7 Rh-Ni_(2)P-800CV‖6.7 Rh-Ni_(2)P-800CV)can be directly driven by the solar *** work highlights that electrochemical activation technology provides a robust avenue toward constructing efficient electrocatalysts for sustainable energy conversion.

关键词： Metal oxides Transition metal phosphide Electrocatalysis Alkaline water electrolysis Solar-powered hydrogen production

来源：评论

学校读者我要写书评

暂无评论

Palladium-Catalyzed Tandem Cyclization Strategy for the Assembly of 3-Halo-1,2,5-triarylpyrroles from N-Alkylanilines and Haloalkynes

引用

Chinese Journal of Chemistry 2023年第2期41卷 181-187页

作者： Songjia Fang Huanfeng Jiang Wanqing Wu Key Laboratory of Functional Molecular Engineering of Guangdong Province State Key Laboratory of Luminescent Materials and DevicesSchool of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhouGuangdong 510640China

This report discloses a distinctive palladium-catalyzed sequential tandem cyclization reaction of two molecular haloalkynes and one molecular N-alkylanilines,leading to the efficient assembly of various 3-halo-1,2,5-triarylpyrrole *** carbon-carbon tri-ple bonds and one carbon-halogen bond in two molecular haloalkynes are transformed conveniently in one single step,which may involve the aminoalkynylation of haloalkyne and cyclization of the newly formed enyne *** high chemo-and regiose-lectivities,good functional group tolerance and late-stage modification of the halopyrrole products further illustrate the synthetic value of this strategy.

关键词： Palladium-catalyzed Haloalkynes N-Alkylanilines Cyclization Halopyrroles Amines Insertion Synthetic methods

来源：评论

学校读者我要写书评

暂无评论

Elements gradient doping in Mn-based Li-rich layered oxides for long-life lithium-ion batteries

引用

材料科学技术（英文版） 2025年第4期207卷 266-273页

作者： Yinzhong Wang Shiqi Liu Xianwei Guo Boya Wang Qinghua Zhang Yuqiang Li Yulong Wang Guoqing Wang Lin Gu Haijun Yu Institute of Advanced Battery Materials and Devices College of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China Key Laboratory of Advanced Functional Materials Ministry of EducationBeijing University of TechnologyBeijing 100124China Institute of Advanced Battery Materials and Devices College of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China Key Laboratory of Advanced Functional Materials Ministry of EducationBeijing University of TechnologyBeijing 100124China Beijing Create Energy & Benefit Future Co. Ltd.Beijing 100176China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China National Center of Electron Microscopy in Beijing School of Materials Science and EngineeringTsinghua UniversityBeijingChina

The cobalt-free Mn-based Li-rich layered oxide material has the advantages of low cost,high energy den-sity,and good performance at low temperatures,and is the promising choice for energy storage ***,the long-cycling stability of batteries needs to be ***,the Mn-based Li-rich cath-ode materials with small amounts of Li2MnO3 crystal domains and gradient doping of Al and Ti elements from the surface to the bulk have been developed to improve the structure and interface *** the batteries with a high energy density of 600 Wh kg-1,excellent capacity retention of 99.7％with low voltage decay of 0.03 mV cycle-1 after 800 cycles,and good rates performances can be ***,the structure and cycling stability of low voltage Mn-based Li-rich cathode materials can be significantly improved by the bulk structure design and interface regulation,and this work has paved the way for developing low-cost and high-energy Mn-based energy storage batteries with long lifetime.

关键词： Mn-based Li-rich layered oxide cathode Li2MnO3 crystal domain Elemental gradient Lithium-ion batteries Energy storage

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：