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Effect of bond length and radius on superconducting transition temperature for FeAs-based superconductors

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science{1.(physics,Mechanics & Astronomy) 2010年第1期53卷 59-63页

作者： chen Ning 1 , liU Yang 1 , JIA YaKui 1 , QU ShaoPeng 1 , ZHANG WanJie 1 & li Yang 2 1 school of Material science and engineering, university of science and technology beijing, beijing 1.0083, china 2 Department of engineering science and materials, university of Puerto Rico at Mayaguez, Mayaguez PR 00681-9044, USA 1. school of Material {1. and engineering University of Science and Technology Beijing Beijing 100083 China2. Department of Engineering Science and Materials University of Puerto Rico at Mayaguez Mayaguez PR 00681-9044 USA

By comparing the data of lattice parameters of more than 50 new FeAs-based high temperature superconductors in two syetems, the effect of bondlength on superconducting transition temperature (T C ) was found that, for both FeAs superconductor systems with similar ionic radii of cation A, the bond length L As-A between Arsenic atom and its nearest neighbor cation at the A site is in an inverse proportion to T C , i.e. the larger the bond length L As-A , the lower the T C . In addition, we also found a noticeable effect of ionic radius on T C , in which deviation from the tendency line of bond length vs. T C decreases with the increasing ionic radius. Both bond length-T C and ionic radii-T C relations indicate that the interaction of cation A and As ion have significant effect on superconductivity. The analysis on the electronic structure indicates that there exists the proximity of the secondary-outer p-orbit of the cation A and the 4s orbit of the As ion, both in energy space and in real space. Some high frequency individual vibrating modes would be established through exchange coupling on their inner orbits. It is worth of mention that the superconducting condensation is influenced by the interaction between the cation A and the As atoms.

关键词： lattice constant FeAs-based superconductor superconducting transition temperature

Research progress in the inner surface modification of metal tubes by plasma processing

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Progress in Natural science:{1. International 2006年第11期16卷 1119-1126页

作者： ZHANG Guling~ 1,2 **, WU Xingfang~1, GU Weichao~2, chen Guangliang~2, FENG Wenran~2, NIU Erwu~2, li li~2, L Guohua~2, chen huan~2, FAN Songhua~2, liU Chizi~2 and YANG Size~2(1. school of Material science and engineering, university of science and technology beijing, beijing 1.0083, china 2. beijing National Laboratory for Condensed Matter physics, Institute of physics, Chinese Academy of sciences, beijing 1.0080, china) school of Material {1. and engineering University of Science and Technology Beijing Beijing 100083 China beijing National Laboratory for Condensed Matter {1. Institute of Physics Chinese Academy of Sciences Beijing 100080 China

The recent progress in inner surface hardening of tubes by plasma processing is summerized. Several techniques of inner surface plasma source ion implantation and deposition are introduced, and their advantages and disadvantages are discussed. The basic principles, technical features and new progress of inner surface plasma source ion implantation methods for metal tubes, which were developed in our laboratory, are described in detail. And perspectives of the future technical development for inner surface ion implantation of tubes are presented.

关键词： PSII metal tubes inner surface surface modification.

In-situ growth and photoluminescence of β-Ga_2O_3 cone-like nanowires on the surface of Ga substrates

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science{1.(Technological sciences) 2009年第6期52卷 1712-1721页

作者： liU RuiNi1,YANG HeQing1,ZHANG RuiGang1,DONG HongXing1,chen XiaoBo1,li li1,ZHANG lihui1,MA Junhu1 & ZHENG HaiRong2 1 Key Laboratory of Macromolecular science of Shaanxi Province,school of Chemistry and materials science,Shaanxi Normal university,Xi’an 710062,china 2 school of physics & information technology,Shaanxi Normal university,Xi’an 710062,china 1. Key Laboratory of Macromolecular science of Shaanxi Province School of Chemistry and Materials Science Shaanxi Normal University Xi’an 710062 China 2. school of {1. & information technology Shaanxi Normal University Xi’an 710062 China

β-Ga2O3 cone-like nanowires have been in-situ grown on the surface of gallium grains and films by heating gallium substrates at 750-1.00℃ for 2h in *** controllable synthesis of β-Ga2O3 nano-wires with different diameters and lengths was achieved by adjusting the heating temperature and *** as-synthesized products were characterized by means of X-ray diffraction,scanning electron mi-croscopy and transmission electron *** results showed that the β-Ga2O3 nanowires are single crystalline with a monoclinic structure and have a controllable diameter and length in the range of 30-1.0nm and 0.5-1.5μm,respectively.A possible mechanism was also proposed to account for the formation of β-Ga2O3 cone-like *** spectra of the β-Ga2O3 nanowires obtained at different temperatures were measured at room temperature,and a strong blue photolumi-nescence with peaks at 430 and 460nm and a weak red photoluminescence with peak at 71.nm were *** blue light emission intensity decreases with increasing the reaction temperature,how-ever,the red light emission intensity hardly *** blue and red light emissions originate from the recombination of an electron on an oxygen vacancy with a hole on a gallium-oxygen vacancy pair and the nitrogen dopants,etc.,respectively.

关键词： β-Ga2O3 cone-like nanowires photoluminescence in-situ growth

Tunneling conductance in graphene ferromagnet/p wave superconductor junctions

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science{1.(physics,Mechanics & Astronomy) 2012年第4期Mechanics & Astronomy) .卷 649-653页

作者： li XiaoWei 1,2*,chen huaBao 1 & liU ShuJing 1 1 school of physics and Electronic electrical engineering,huaiyin Normal university,huaian 223300,china 2 State Key Laboratory of Functional materials for Informatics,Shanghai Institute of Microsystem and information technology,Chinese Academy of sciences,Shanghai 200050,china 1. school of {1. and Electronic electrical engineering Huaiyin Normal University Huaian 223300 China2. State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

Using the extended Blonder-Tinkham-Klapwijk formalism,we investigate the conductance spectra of graphene ferromagnet/p wave superconductor *** is found that the conductance spectra are affected by the p wave pairing *** ferromagnetic exchange energy in the ferromagnet can suppress Andreev retroreflection but enhance the specular Andreev reflection in graphene ferromagnet/p wave superconductor *** conductance decreases with increasing exchange energy Eh for EhEF.

关键词： graphene ferromagnet p wave superconductor tunneling conductance

Sorption of Eu(Ⅲ) on GMZ bentonite in the absence/presence of humic acid studied by batch and XAFS techniques

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science{1. Chemistry 2010年第6期53卷 1420-1428页

作者： hu Jun1,2,XIE Zhi3,HE Bo3,SHENG GuoDong1,chen ChangLun1,li JiaXing1,chen YiXue2 & WANG XiangKe1 1Key Laboratory of Novel Thin Film Solar Cells Institute of Plasma physics,Chinese Academy of sciences,Hefei 230031,china 2school of Nuclear science and engineering,North china Electric Power university,beijing 102206,china 3National Synchrotron Radiation Laboratory,university of science & technology of china,Hefei 230029,china Key Laboratory of Novel Thin Film Solar Cells Institute of Plasma physics Chinese Academy of Sciences Hefei China school of Nuclear {1. and engineering North China Electric Power University Beijing China National Synchrotron Radiation Laboratory University of Science & Technology of China Hefei China

Bentonite has been extensively studied because of its strong sorption ability and low *** this work,the Na-bentonite from Gaomiaozi County ({1.) has been characterized by XRD,FTIR and acid-base *** sorption of Eu(III) on Na-bentonite in the absence/presence of humic acid (HA) was studied at T = 25 ± 2 °C and in 0.01.mol/L NaClO4 *** effects of pH,HA,contact time and initial Eu(III) concentrations were also *** results indicate that the sorption of Eu(III) on Na-bentonite was dependent on pH *** presence of HA had little effect on Eu(III) sorption at low pH values,but decreased Eu(III) sorption at high pH values.X-ray absorption fine structure spectroscopy (XAFS) was applied to characterize the local structural environment of the adsorbed Eu(III) on bare Na-bentonite and HA-bentonite *** re- sults indicate that Eu(III) was bound to O atoms at a distance of about 2.39  at pH *** results are crucial for the evalua- tion of the sorption and migration of other trivalent lanthanides and actinides in bentonite as backfill materials.

关键词： Na-bentonite Eu(III) sorption humic acid XAFS

Preparation of graphene and TiO2 layer by layer composite with highly photocatalytic efficiency

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Progress in Natural science:{1. International 2011年第6期21卷 467-471页

作者： Yu-peng ZHANG~1.Jun-jie XU~1.Zhi-hua SUN~1.{1.-zhe li~1.Chun-xu PAN~(1.2) 1.Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, school of physics and technology,Wuhan university,Wuhan 430072,china 2.Center for Electron Microscopy,Wuhan university,Wuhan 430072,china [a] Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education School of Physics and Technology Wuhan University Wuhan 430072 China [b] Center for Electron Microscopy Wuhan University Wuhan 430072 China

A process for fabricating graphene and TiO2layer by layer composite was introduced to improve the photocatalytic activity by controlling the layers,thickness and the mass ratio between graphene and *** graphene oxide（GO） was synthesized from natural graphite powder by the modified {1.mmers ***-area uniform GO and TiO2thin films were made by a spin-coating process in *** exposure of the TiO2/GO multilayer film to UV light irradiation which allows the reduction of GO to graphene,a novel photocatalytic structure as graphene and TiO2layer by layer composite was *** cross-sectional SEM image showed that a clear layer by layer microstructure with a single layer thickness of graphene or TiO2was in the range of about 50 *** total thickness of the film was around 5μm which was varied according to the layer number of spin coating *** spectra revealed that significant structural changes occurred through UV light *** for methylene blue（MB） exhibited that the layer by layer composite is of higher photocatalytic activity than the pure TiO2layer.

关键词： graphene TiO2 photocatalysis layer by layer composite

Anticoagulation property and security of artificial heart valve material

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science{1.(Technological sciences) 2005年第2期48卷 145-162页

作者： WANG Xianghui1, , liU Xianghuai1,22, 3, ZHANG Feng2, li Changrong2, YU liujiang2, ZHENG Zhihong2, WANG Xi2, JIANG Zhenbin4, chen Anqing4 & XU Jingfang3 1. Department of physics, East china Normal university, Shanghai 200062, china 2. Ion Beam Lab, Shanghai Institute of Mini-system and information, Chinese Academy of sciences,Shanghai 200050, china 3. Department of Electronics, school of information science and technology, East china Normal Univer- sity, Shanghai 200062, china 4. Shanghai Cardiovascular Institute, Zhongshan Hospital, Shanghai 200032, china 1. Department of physics East China Normal University 200062 Shanghai China 2. Ion Beam Lab Shanghai Institute of Mini-system and information Chinese Academy of Sciences 200050 Shanghai China 3. Department of Electronics School of Information Science and Technology East China Normal University 200062 Shanghai China 4. Shanghai Cardiovascular Institute Zhongshan Hospital 200032 Shanghai China

Heart valve diseases threaten human health. One re{1.able way to save {1.ves of such patients is to replace the pathologically changed heart valves by artificial ones. Over 2 mil{1.on patients have received LTI-carbon heart valve’s implantation. However, the thrombosis after the implantation is one of the difficulties that need to be solved. In order to improve the blood compatibi{1.ty and security of mechanical heart valves, ion beam technology was used to modify the surface properties of the materials. The investigation results have been summarized in this paper.

关键词： artificial heart valve, ion implantation, plasma immersed ion implantation, ion beam enhanced deposition.

Efficient micrometer-scale thick-film perovskite solar cells with superior stability

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Rare Metals 2024年第4期43卷 1647-1657页

作者： Jian-Fei hu Gang {1. Shun-Zhang Yu Yue-Xin lin Kai-Yu Wang Zong-Wei li Guo-Dong Zhang Teng-Fei Pan Ya-Jing li Ming-Jie li Ying-Dong Xia Yi-Fan Lv Yong-hua {1. Key Laboratory of Flexible Electronics(KLoFE)and Institute of Advanced materials(IAM) School of Flexible Electronics(Future Technologies)Nanjing Tech University(NanjingTech)Nanjing211816China Department of Applied {1. The Hong Kong Polytechnic UniversityHong Kong999077China Shenzhen Research Institute The Hong Kong Polytechnic UniversityShenzhen518057China Optics Valley Laboratory Hubei430074China

It is essential to enhance the thickness of the absorber layer for perovskite solar cells(PSCs)to improve device performance and reduce industry ***,thick perovskite films(>1.m)are difficult to be fabricated by employing traditional solvents,such as N,N-dimethylformamide(DMF),dimethyl sulfoxide(DMSO).Besides,it is a challenge to fabricate thick-film perovskite owing to the deteriorated surface morphology and serious defect ***,a simple method was reported to deposit uniform pinhole-free perovskite films with a thickness of more than 2μm utilizing the methylamine acetate(MAAc)ionic liquid as the *** with methylammonium chloride(MACl)as an additive,thick-film perovskite with~2μm in grain size and few grain boundaries(GBs)was prepared,which dramatically improved the perovskite crystal quality and enhanced carrier transport *** final PSCs exhibited a power conversion efficiency(PCE)of 20.1.%.The device showed improved stability with 95%of its initial efficiency in a nitrogen environment over 5000 *** work provides an alternative strategy to produce extremely efficient and stable thick-film *** can be believed that this device has great potential in the application of large areas and laminated PSCs.

关键词： Perovskite solar cells Thick-film Stability Ionic liquid

Construction of Dynamic Alloy Interfaces for Uniform li Deposition in li-Metal Batteries

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Energy & Environmental materials 2024年第3期7卷 64-71页

作者： Qingwen li Yulu liu Ziheng Zhang Jinjie chen Zelong Yang Qibo Deng Alexander V.Mumyatov Pavel A.Troshin Guang He Ning hu Tianjin Key Laboratory of Advanced Functional Porous materials Institute for New Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Tianneng Co.Ltd Huzhou 313100China Key Laboratory of Hebei Province on Scale-span Intelligent Equipment {1. Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehiclesand School of Mechanical EngineeringHebei University of TechnologyTianjin 300401China Federal Research Center for Problems of Chemical physics and Medicinal Chemistry Academician Semenov ave.1Chernogolovka Moscow Region 142432Russia Zhengzhou Research Institute of HIT 26 Longyuan East 7thJinshui DistrictZhengzhou 450000Henan Province China Harbin Institute of technology 92 West Dazhi StreetNan Gang DistrictHarbin 150001China

It is well accepted that a lithiophilic interface can effectively regulate li deposition behaviors,but the influence of the lithiophilic interface is gradually diminished upon continuous li deposition that completely isolates li from the lithiophilic ***,we perform in-depth studies on the creation of dynamic alloy interfaces upon li deposition,arising from the exceptionally high diffusion coefficient of Hg in the amalgam solid *** a comparison,other metals such as Au,Ag,and Zn have typical diffusion coefficients of 1.-20 orders of magnitude lower than that of Hg in the similar solid solution *** difference induces compact li deposition pattern with an amalgam substrate even with a high areal capacity of 55 mAh cm^(-2).This finding provides new insight into the rational design of li anode substrate for the stable cycling of li metal batteries.

关键词： diffusion coefficient dynamic alloy interfaces li dendrites li solid solution uniform li deposition