检索结果-南通市图书馆

Half-Covered'Glitter-Cake'AM@SE Composite:A Novel Electrode Design for High Energy Density All-Solid-State Batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第5期17卷 463-478页

作者： Min Ji Kim Jin-Sung Park Jin Woong Lee Sung Eun Wang Dowoong Yoon Jong Deok Lee Jung Hyun Kim Taeseup Song Ju Li Yun Chan Kang Dae Soo Jung Energy and Environmental Division Korea Institute of Ceramic Engineering and TechnologyJinjuGyeongnam 52851Republic of Korea department of Materials Science and Engineering Korea UniversityAnam-DongSeongbuk-GuSeoul 136-713Republic of Korea department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 20139USA department of Materials Science and Engineering Ajou UniversitySuwon 16499Republic of Korea department of Energy Systems Research Ajou UniversitySuwon 16499Republic of Korea department of Energy Engineering Hanyang UniversitySeoul 04763Republic of Korea department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

All-solid-state batteries(ASSBs)are pursued due to their potential for better safety and high energy ***,the energy density of the cathode for ASSBs does not seem to be satisfactory due to the low utilization of active materials(AMs)at high *** small amount of solid electrolyte(SE)powder in the cathode,poor electrochemical performance is often observed due to contact loss and non-homogeneous distribution of AMs and SEs,leading to high tortuosity and limitation of lithium and electron transport ***,we propose a novel cathode design that can achieve high volumetric energy density of 1258 Wh L^(-1)at high AM content of 85 wt%by synergizing the merits of AM@SE core–shell composite particles with conformally coated thin SE shell prepared from mechanofusion process and small SE *** core–shell structure with an intimate and thin SE shell guarantees high ionic conduction pathway while unharming the electronic *** addition,small SE particles play the role of a filler that reduces the packing porosity in the cathode composite electrode as well as between the cathode and the SE separator *** systematic demonstration of the optimization process may provide understanding and guidance on the design of electrodes for ASSBs with high electrode density,capacity,and ultimately energy density.

关键词： All-solid-state batteries Cathodes Sulfide-based solid electrolytes Interfaces Mechanofusion

Electrical analysis of inter-growth structured Bi_4Ti_3O_(12)-Na_(0.5)Bi_(4.5)Ti_4O_(15) ceramics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第7期26卷 386-392页

作者：江向平江亚林江兴安陈超涂娜陈云婧 Jiangxi Key Laboratory of Advanced ceramic Materials Department of Material Science and EngineeringJingdezhen Ceramic Institute

Inter-growth bismuth layer-structured ferroelectrics（BLSFs）, Bi_4Ti_3O_（12）-Na_（0.5）Bi_（4.5）Ti_4O_（15）（BIT-NBT）, were successfully synthesized using the traditional solid-state reaction method. X-ray diffraction（XRD） Rietveld refinements were conducted using GSAS software. Good agreement and low residual are obtained. The XRD diffraction peaks can be well indexed into I2 cm space group. The inter-growth structure was further observed in the high-resolution TEM image. Dielectric and impedance properties were measured and systematically analyzed. At the temperature range 763-923 K（below T_c）, doubly ionized oxygen vacancies（OVs） are localized and the short-range hopping leads to the relaxation processes with an activation energy of 0.79-1.01 eV. Above T_c, the doubly charged OVs are delocalized and become free ones, which contribute to the long-range dc conduction. The reduction in relaxation species gives rise to a higher relaxation activation energy ~ 1.6 eV.

关键词： Bi4Ti3O12-Na0.5Bi4.5Ti4O15 impedance spectroscopy oxygen vacancies-related defect dipoles electrical analysis

Microstructure and hardness of Mg-based composites reinforced with Mg_2Si particles

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2009年第4期28卷 396-400页

作者： Mustafa Aydin Cem zgür Osman San Mechanical Engineering department Dumlupinar University ceramic Engineering department Dumlupinar University

Magnesium powders were mechanically alloyed with SiO2 powder particles having different particle sizes using nigh-energy ball milling techniques under Ar atmosphere for 1 h. The powders were consolidated with cold pressing under 560 MPa. They were then sintered at 550℃ for 45 min under Ar atmosphere. The composites obtained on the Mg-SiO2 system were investigated using the Archimedes principle, a differential scanning calorimeter, X-ray diffraction, optic microscopy, and scanning electron microscopy. For the mechanically alloyed powders, the solid-state reaction of the synthesis of Mg2Si and MgO progressed further during sintering of the materials. The results showed that the strengthening mechanisms were dependent on dispersion hardening of fine Mg2Si and MgO particulates dispersed homogeneously in the matrix. Mg-

关键词： based composites SiO2 mechanical alloying strengthening mechanism

Photoluminescence and electrical properties of Er3＋-dopedNa0.5Bi4.5Ti4O15-Bi4Ti3O12 inter-growth ferroelectric ceramics

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2017年第1期11卷 51-58页

作者： Yalin JIANG Xiangping JIANG Chao CHEN Yunjing CHEN Xingan JIANG Na TU Jiangxi Key Laboratory of Advanced ceramic Materials Department of Material Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333001 China

Upconversion （UC） and electrical properties of Na0.5Bi8.5-xErxTi7O27 （NBT-BIT-xEr, 0.00≤x≤0.25） ceramics were studied. Structural analysis revealed that a single inter-growth structured phase exists in all samples and the Er3＋ ion substituting for Bi3＋ at the A-site increases the orthorhombic distortion. Under the 980 nm laser excitation, two characteristic green emission bands and one red emission band were situated at 527, 548 and 670 nm, corresponding to the transitions 2H11/2 → 4I15/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2, respectively. The optimal photoluminescence （PL） were found in the NBT-BIT-0.20Er sample, and the emission color transforms from green to yellowish green. Temperature dependence of fluorescence intensity ratio （FIR） for NBT-BIT-0.20Er was measured ranging from 290 to 440 K and its maximum sensitivity was calculated to be about 0.0020 K-1 at 290 K. Dielectric measurements indicated that Tc slightly increased simultaneously with the decrease of tanS. Therefore, this ceramic has potential applications for high-temperature multifunctional devices.

关键词： inter-growth structure photoluminescence (PL) electrical properties multifunctional materials

Photoluminescence and electrical properties of Eu^3＋-doped Na0.5Bi4.5Ti4O15-based ferroelectrics under blue light excitation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2016年第1期10卷 31-37页

作者： Xing-an JIANG Xiang-ping JIANG Chao CHEN NaTU Yun-jing CHEN Ban-chao ZHANG Jiangxi Key Laboratory of Advanced ceramic Materials Department of Materials Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333001 China

Na0.5Bi4.5-xEuxTi4O15 （NBT-xEu^3＋） ceramics with x= 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30 and 0.40 were prepared by conventional ceramics processing. NBT-0.25Eu^3＋ ceramics show the strongest red and orange emissions corresponding to the 5D0 → 7F2 （617 nm） and 5D0→ 7F1 （596 nm） transitions, respectively. The strongest excitation band around 465 nm matches well with the emission wavelength of commercial InGaN-based blue LED chip, indicating that Eu^3＋-doped NBT ceramics may be used as potential environmental friendly red-orange phosphor for W-LEDs application. As an inherent ferroelectric and piezoelectric material, the electrical properties of this potentially multifunctional electro-optical material have been also studied. The introduction of Eu^3＋ distinctly increased the Curie temperature （Tc） of NBT-xEu^3＋ ceramics from 640℃ to 711℃ as x ranges from 0 to 0.40. For higher temperature applications, the electrical conductivity was also investigated. The conduction of charge carriers in hightemperature range originates from the conducting electrons from the ionization of oxygen vacancies. High Tc and low tanδ makes Eu^3＋-doped NBT ceramic also suitable for high temperature piezoelectric sensor applications and electro-optical integration.

关键词： Aurivillius bismuth layered structure photoluminescence electricalproperties multifunctional materials

High performance Aurivillius type Na_(0.5)Bi_(4.5)Ti_(4)O_(15) piezoelectric ceramics with neodymium and cerium modification

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced ceramics 2015年第1期4卷 54-60页

作者： Xiang-Ping JIANG Xiao-Long FU Chao CHEN Na TU Ming-Zhu XU Xiao-Hong LI Hong SHAO Yun-Jing CHEN department of Material Science and Engineering Jiangxi Key Laboratory of Advanced Ceramic MaterialsJingdezhen Ceramic InstituteJingdezhen 333001JiangxiChina

Bismuth layer-structured ferroelectric ceramics of Na0.5Bi4.5-x(Nd_(0.5)Ce_(0.5)))xTi4O15(NBT-x,0.0≤x≤0.4)were synthesized by a traditional solid-state *** effect of(Nd,Ce)substitution for A-site on the microstructure and electrical properties of Na_(0.5)Bi_(4.5)Ti_(4)O_(15)(NBT)-based piezoelectric ceramics was investigated.X-ray diffraction(XRD)analysis revealed that the(Nd,Ce)-modified NBT ceramics have a pure four-layer Aurivillius type *** piezoelectric properties of NBT ceramics were significantly improved by the modification of neodymium and *** Curie temperature TC gradually decreased from 638℃to 618℃with increasing the(Nd,Ce)*** piezoelectric constant d33,mechanical quality factor Qm,dielectric loss tanδand Curie temperature TC of the Na0.5Bi4.3(Nd_(0.5)Ce_(0.5)))0.2Ti4O15 ceramic were found to be 28 pC/N,3239,0.0032 and 630℃,*** annealing studies indicated that the(Nd,Ce)-modified NBT ceramics possess stable piezoelectric properties,demonstrating that the Na0.5Bi4.3(Nd_(0.5)Ce_(0.5)))0.2Ti4O15 ceramic is a promising candidate for high temperature applications.

关键词： lead-free Na_(0.5)Bi_(4.5)Ti_(4)O_(15)(NBT)ceramics piezoelectric properties

Photocatalytic properties of CaTi_(2)O_(5)via a facile additive-free aqueous strategy with different pH values

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2021年第7期40卷 1746-1752页

作者： Wei-Xia Dong Qi-Fu Bao X-YGu Hui-Juan Shen Peng-Yan Liu department of Material Science and Engineering Jingdezhen Ceramic InstituteJingdezhen 333001China

CaTi_(2)O_(5)was selectively prepared by a solvothermal process without template and *** phase of the as-prepared samples was determined by X-ray diffraction(XRD).The microstructure was characterized by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Results found that pH values had a crucial effect on the crystal phase and shape evolution of the ***_(2)O_(5)sample prepared at pH of 5.2 shows high efficient light harvesting,large surface area and ***,CaTi_(2)O_(5)shuttle-like sample shows good photocatalytic activity against methyl orange due to its longer and thinner shuttle-like morphology and high crystallinity,enhanced light harvesting and large surface *** photocatalytic rate of CaTi_(2)O_(5)shuttle-like structure reaches 0.1988 min-1 for 25-min methyl orange degradation under the ultraviolet light irradiation and displays an excellent photostability with a degradation efficiency of 0.1952 min^(-1)after four cycles.

关键词： pH CaTi_(2)O_(5) Solvothermal method Photocatalytic properties

Preparation,crystallization,microstructure and dielectric properties of lead bismuth titanate borosilicate glass ceramics

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced ceramics 2014年第3期3卷 194-206页

作者： Chandkiram RGAUTAM Abhishek MADHESHIYA Ranabrata MAZUMDER Advanced Glass and Glass ceramic Research Laboratory Department of PhysicsUniversity of LucknowLucknow 226007India department of ceramic Engineering National Institute of TechnologyRouerkela 769008India

Various bulk and transparent glasses were prepared by rapid melt quenching technique in the glass system 55[(Pb_(x)Bi_(1-x))TiO_(3)]-44[2Si_(O)2B_(2)O_(3)]-La2O3(x=0-0.7).The X-ray diffraction(XRD)studies of the glass samples confirmed the amorphous *** differential thermal analyses(DTA)were carried out from room temperature to 900℃with a heating rate of 10℃/*** DTA patterns of the samples showed one or more exothermic sharp peaks shifting towards lower temperature side with increasing concentration of bismuth oxide(BiO).On the basis of DTA results,the solid solution of bismuth titanum oxide(Bi_(2)Ti_(2)O_(7))/lead bismuth titanium oxide(Pb3Bi4Ti6O21)was precipitated in borosilicate glassy matrix as a major *** glasses were subjected to 4 h and 8 h heat treatment schedules to convert into glass *** analysis of these glass ceramic samples showed that the major crystalline phase of the entire glass ceramic samples with 0≤x≤0.5 is found to have cubic crystal structure,while it is tetragonal for glass ceramic sample with x=*** scanning electron microscopy(SEM)micrographs indicated the uniform distribution of Bi_(2)Ti_(2)O_(7)and Pb3Bi4Ti6O21 crystallites in the glassy matrix.

关键词： lead bismuth titanate differential thermal analysis(DTA) crystallization scanning electron microscopy(SEM) dielectric behavior

Neutrino Mass Generation in SO(4) Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2010年第8期54卷 305-307页

作者： Indranath Bhattacharyya department of Mathematics Govt.College of Engineering and Ceramic Technology

Generation of neutrino mass in SO（4） model is proposed here. The algebraic structure of SO （4） is same as to that ofSU（2）L x SU（2）R. It is shown that the spontaneous symmetry breaking results three massive as well as three massless gauge bosons. The standard model theory according to which there exist three massive gauge bosons and a massless one is emerged from this model. In the framework ofSU（2）L x SU（2）R a small Dirac neutrino mass is derived. It is also shown that such mass term may vanish with a special choice. The Majorana mass term is not considered here and thus in this model the neutrino mass does not follow seesaw structure.

关键词： left right symmetry S0(4) modei extension of electroweak gauge sectors neutrino mass generation Dirac neutrino mass