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Magnetron sputtering synthesis of large area well-ordered boron nanowire arrays

science china(Physics,Mechanics & Astronomy) 2004年第4期47卷 403-415页

作者： cao limin1,2. zhang ze2.& wang wenkui1,{2. key laboratory of metastable materials science and technology and College of materials science and engineering,{12., qinhuangdao 066004, china 2. Institute of Physics, Chinese Academy of sciences, Beijing 100080, china key laboratory of {2. materials science and technology and College of materials science and engineering Yanshan University Qinhuangdao China Institute of Physics Chinese Academy of Sciences Beijing China

One-dimensionally nanostructured materials, such as nanowires and nanotubes, are the smallest dimensional structures for efficient transport of electrons and excitons, and are therefore critical building blocks for nanoscale electronic and mechanical devices. In this paper, boron nanowires with uniform diameters from 2. to 80 nm were synthesized by radio-frequency magnetron sputtering of pure boron powder and B2.3 powder mixtures in argon atmosphere. The boron nanowires produced stand vertically on the substrate surface to form well-ordered arrays over large areas with self- organized arrangements without involvement of any template and patterned catalyst. The high-density boron nanowires are parallel to each other and well distributed, forming highly ordered and uniform arrays. A more interesting and unique feature of the boron nanowires is that most of their tips are flat rather than hemispherical in morphologies. Detailed studies on its structure and composition indicate that boron nanowires are amorphous. Boron nanowire appears as a new member in the family of one-dimensional nanostructures. Considering the unique properties of boron-rich solids and other nanostructures, it is reasonable to expect that the boron nanowires will display some exceptional and interesting properties. A vapor-cluster-solid (VCS) mechanism was proposed to explain the growth of boron nanowires based on our experimental observations.

关键词： boron nanowires, magnetron sputtering, arrays, self-assembly.

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Large-scale boron nanowire nanojunctions and their highly-oriented arrays

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science china(Physics,Mechanics & Astronomy) 2004年第5期47卷 621-632页

作者： cao limin1,2. zhang ze2.& wang wenkui1,{2. key laboratory of metastable materials science and technology, yanshan university, qinhuangdao 066004, china 2. Institute of Physics, Chinese Academy of sciences, Beijing 100080, china key laboratory of {2. materials science and technology Yanshan University Qinhuangdao China Institute of Physics Chinese Academy of Sciences Beijing China

Highly oriented multiple boron nanowire nanojunctions with unilateral feather- like morphology were first successfully prepared using a radio-frequency magnetron sputtering method. The branched boron nano-feathers always nucleate and grow on the same sidewall of the stems, and align in parallel to form multiple T- and/or Y-type nanojunctions. The diameters of the branches and the stems are in the range of 2.—40 and 60—80 nm, respectively. The thinner branches and thicker stems of the boron nanowires self-assembled into large-scale, highly ordered arrays on various substrates. During the formation and self-assembly of the arrays, no template or catalyst was needed. We believe that the approach presented here can be used to fabricate heterostructures with bottom-up assembly of a wide variety of one-dimensional nanostructures via the rational design of targets and the proper control of the experimental conditions.

关键词： boron nanowires, nanojunctions, self-assembly, magnetron sputtering.

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Effect of Al2.3 on the viscosity of cao-SiO2.Al2.3-MgO-Cr2.3 slags

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International Journal of Minerals,Metallurgy and materials 2021年第5期28卷 797-803页

作者： Chen-yang Xu Cui wang Ren-ze Xu Jian-liang zhang Ke-xin Jiao School of Metallurgical and Ecological engineering University of Science and Technology BeijingBeijing 100083China State key laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

We investigated the effect of Al2.3 content on the viscosity of cao-SiO2.Al2.3-8wt%MgO-1wt%Cr2.3(mass ratio of cao/SiO2.is 1.0,and Al2.3 content is 17wt%-2.wt%)*** results show that the viscosity of the slag increases gradually with increases in the Al2.3 content in the range of 17wt%to 2.wt%due to the role of Al2.3 as a network former in the polymerization of the aluminosilicate structure of the *** increases in the Al2.3 content from 17wt%to 2.wt%,the apparent activation energy of the slags also increases from 180.85 to 2.0.2. kJ/mol,which is consistent with the variation in the critical *** Fourier-transform infrared spectra indicate that the degree of polymerization of this slag is increased by the addition of *** application of Iida’s model for predicting the slag viscosity in the presence of Cr2.3 indicates that the calculated viscosity values fit well with the measured values when both the temperature and Al2.3 content are at relatively low levels,i.e.,the temperature range of 1673 to 1803 K and the Al2.3 content range of 17wt%-2.wt%in cao-SiO2.Al2.3-8wt%MgO-1wt%Cr2.3 slag.

关键词： slag viscosity high aluminium oxide apparent activation energy structure viscosity prediction

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CEPC Technical Design Report

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Radiation Detection technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu cao Jianshe cao Antoine Chance Xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen Jinhui Chen Ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen Xun Chen Xurong Chen Ye Chen Ying Chen Yukai Chen zelin Chen Zilin Chen Gang Chen Boping Chen Chunhui Chen Hok Chuen Cheng Huajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai Xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH university of science and {2. Faculty of Physics and Applied Computer ScienceKrakow Anhui university HefeiAnhui Applied Physics Department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu university Institute of ScienceVaranasi Bandirma Onyedi Eylul university Bandirma Beihang university Beijing Beijing Computational science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of technology Beijing Beijing Normal university Beijing Brown university ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad university Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo university Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central china Normal university WuhanHubei Central South university ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa Chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan china academy of engineering physics MianyangSichuan china building materials academy Beijing china Center of Advanced science and {2. Beijing china Institute of Atomic Energy Beijing china Jiliang university HangzhouZhejiang china Nuclear Instrument CO. LTDBeijing china university of Geo{2.s Beijing china university of Geo{2.s WuhanHubei china university of Mining and {2. XuzhouJiangsu china West Normal university NanchongSichuan Chongqing university Department of PhysicsChongqing Chulalongkorn university Bangkok City university of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell university IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu university DalianLiaoning Dalian university of technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East china university Of {2. And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by china,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2.s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,{2.)and the Conceptual Design Report(CDR,{2.),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection *** is anticipated to begin around 2.2.-2.2.,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2.30s.

关键词： initiated exceeding precise

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Dehydro-Diels-Alder reaction and diamondization of bowl-shaped clusters C_(18)Te_(3)Br_(4)(Bu-O)_(6)

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Nano Research 2022年第5期15卷 4606-4612页

作者： Jinbo zhang Manli Ma Rong Zhou Hongqiang Chu Xue wang Shaojie wang Huhu Tian Zhipeng Yan Mingtao Li Zhongyan Wu Bin Li Jiafeng Yan Lan Anh Thi Nguyen Rongxing cao Guoqing Wu Xianghua zeng Hao-Li zhang Jaeyong Kim Lin wang Yongjun Tian College of Physical science and technology Yangzhou UniversityYangzhou 225002China Center for High Pressure science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China State key laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhou 730000China Baotou Research Institute of Rare Earths Baotou 014000China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Center for High Pressure science and technology Advanced Research Shanghai 201203China Department of Physics and High Pressure Research CenterHanyang UniversitySeoul 04763Republic of Korea

Dehydro-Diels-Alder(DDA)reaction is a textbook reaction for preparing six-membered rings in solution but is scarcely seen in solid-state *** this work,using multiple characterization techniques,we demonstrate that the bowl-shaped clusters C_(18)Te_(3)Br_(4)(Bu-O)_(6) might experience a DDA reaction at room temperature and high pressure between 5.5 and 7.4 *** 17.0 GPa,it is found that the bonding conversion from the intramolecular sp^(2. to the intermolecular spa occurred,in the form of pressure-induced *** recovered samples from 2..0 and 36.1 GPa showed incomplete reversibility,while the decompression-induced graphitization of glassy carbon was observed during decompression from 46.5 *** electrochemical impedance spectroscopy results indicated that the transport properties changed from grain boundary dominant to grain dominant due to the DDA reaction and the grain boundary effect disappeared as the intermolecular sp3 bonding building-up and carrier transmission channel formation above 17.0 *** results in this study open a new route to construct the crystalline carbon materials with different transport properties.

关键词： polycyclic aromatic hydrocarbons dehydro-Diels-Alder reaction diamondization high-pressure

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Raman and infrared spectra of complex low energy tetrahedral carbon allotropes from first-principles calculations

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Chinese Physics B 2020年第9期29卷 311-319页

作者： Hui wang ze-Yu zhang Xiao-Wu Cai Zi-Han Liu Yong-Xiang zhang Zhen-Long Lv Wei-Wei Ju Hui-Hui Liu Tong-Wei Li Gang Liu Hai-Sheng Li Hai-Tao Yan Min Feng Henan key laboratory of Photoelectric Energy Storage {2. and Applications School of Physics EngineeringHenan University of Science and TechnologyLuoyang 471023China First High School of Luoyang City Luoyang 471001China Institute of Microelectronics of Chinese Academy of sciences Beijing 100029China School of Physics Nankai UniversityTianjin 300071China

Up to now,at least 806 carbon allotropes have been proposed *** interesting carbon allotropes(named Pbam-32.P6/mmm,and I43d)were recently uncovered based on a random sampling strategy combined with space group and graph *** calculation results show that they are superhard and remarkably stable compared with previously proposed metastable *** indicates that they are likely to be synthesized in *** use the factor group analysis method to analyze theirΓ-point vibrational *** to their large number of atoms in primitive unit cells(32.atoms in Pbam-32.36 atoms in P6/mmm,and 94 atoms in I43d),they have many Raman-and infrared-active *** are 48 Raman-active modes and 37 infrared-active modes in Pbam-32.2. Raman-active modes and 14 infrared-active modes in P6/mmm,and 34 Raman-active modes and 35 Raman-and infrared-active modes in *** calculated Raman spectra can be divided into middle frequency range from 600 cm-1 to 1150 cm-1 and high frequency range above 1150 *** largest infrared intensities are 0.82.0.77,and 0.70(D/Å)2.amu for Pbam,P6/mmm,and I43d,*** calculated results provide an insight into the lattice vibrational spectra of these sp3 carbon allotropes and suggest that the middle frequency Raman shift and infrared spectrum may play a key role in identifying newly proposed carbon allotropes.

关键词： Raman and infrared spectra carbon allotrope first-principles calculation

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连铸坯全断面非金属夹杂物成分分布的预报

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钢铁 2021年第10期56卷 74-82页

作者：张月鑫张立峰王举金牛凯军王亚栋北京科技大学冶金与生态工程学院北京100083 燕山大学亚稳材料制备技术与科学国家重点实验室河北秦皇岛066004

为了研究连铸坯全断面非金属夹杂物成分的空间分布,以帘线钢为研究对象,分析了连铸坯宽度方向中心位置由内弧到外弧夹杂物平均成分的变化。随着距连铸坯表层距离的增加,夹杂物中SiO_(2.质量分数由53%显著增加至75%左右,随后逐渐减少到60... 详细信息

为了研究连铸坯全断面非金属夹杂物成分的空间分布,以帘线钢为研究对象,分析了连铸坯宽度方向中心位置由内弧到外弧夹杂物平均成分的变化。随着距连铸坯表层距离的增加,夹杂物中SiO_(2.质量分数由53%显著增加至75%左右,随后逐渐减少到60%;MnO质量分数先减少至12.59%,然后增加至2..87%;cao和Al_(2.O_(3)含量变化较小。此外,建立了可用于预报连铸坯全断面夹杂物成分分布的动力学模型,该模型耦合了钢的传热和凝固、夹杂物成分转变热力学,以及元素在钢中的扩散3方面内容。使用该模型计算得到的氧化夹杂物成分的变化趋势与试验结果基本一致,验证了模型的准确性。同时利用该模型研究了不同总铝、总钙和总氧含量条件的连铸坯内夹杂物成分的演变。其中总铝含量对夹杂物的成分分布影响最大,当总铝质量分数由0.000 1%增至0.001 0%时,夹杂物中SiO_(2.质量分数由57%~64%降至34%~39%;Al_(2.O_(3)质量分数由8%~10%增至37%~41%;MnO含量基本上没有发生变化;cao质量分数由13%~17%降至8%~10%。

关键词：帘线钢夹杂物热力学动力学连铸坯

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2.CrMnTiH齿轮钢凝固和冷却过程中非金属夹杂物的转变研究

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炼钢 2020年第3期36卷 32-38页

作者：张国锋季莎张立峰王亚栋李彩云张威罗艳凌源钢铁股份有限公司辽宁凌源122500 北京科技大学冶金与生态工程学院北京100083 燕山大学亚稳材料制备技术与科学国家重点实验室河北秦皇岛066044

非金属夹杂物的类型、数量、尺寸对齿轮钢的疲劳性能具有重要影响。为了明确2.CrMnTiH齿轮钢在凝固和冷却过程中夹杂物的转变和析出行为,通过Aspex自动扫描电镜对齿轮钢连铸过程中非金属夹杂物的类型、数量、尺寸等进行系统分析。研究发... 详细信息

非金属夹杂物的类型、数量、尺寸对齿轮钢的疲劳性能具有重要影响。为了明确2.CrMnTiH齿轮钢在凝固和冷却过程中夹杂物的转变和析出行为,通过Aspex自动扫描电镜对齿轮钢连铸过程中非金属夹杂物的类型、数量、尺寸等进行系统分析。研究发现,中间包内钢液中氧化物夹杂的主要类型为Al2.3-cao-MgO和Al2.3-cao-CaS型,铸坯中氧化物夹杂的主要类型转变为Al2.3-MgO和Al2.3-CaS型。齿轮钢钢液在凝固和冷却过程氧化物夹杂中cao向CaS转变,夹杂物的数密度降低,平均尺寸略有增加。通过热力学软件FactSage 7.1计算了中间包内钢液在凝固和冷却过程中夹杂物的形成和转变,对齿轮钢在凝固和冷却过程夹杂物的转变提供了理论依据。

关键词：齿轮钢冷却凝固夹杂物新相析出热力学计算

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Q345钢液凝固及铸坯冷却过程中非金属夹杂物的组成演变

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炼钢 2020年第2期36卷 29-33,41页

作者：王祎张立峰杨文雷勋惠张继赵根安北京科技大学冶金与生态工程学院北京100083 燕山大学亚稳态材料制备技术与科学国家重点实验室河北秦皇岛066004

Q345钢生产过程中通过钙处理改性夹杂物,中间包钢水中夹杂物为钙铝酸盐包裹镁铝尖晶石的结构,平均成分为45.71%Al2.3-40.2.%cao-6.50%MgO-6.60%CaS-0.97%SiO2.连铸坯冷却凝固过程,夹杂物发生转变,连铸坯表层冷却速度快,相转变来不及发... 详细信息

Q345钢生产过程中通过钙处理改性夹杂物,中间包钢水中夹杂物为钙铝酸盐包裹镁铝尖晶石的结构,平均成分为45.71%Al2.3-40.2.%cao-6.50%MgO-6.60%CaS-0.97%SiO2.连铸坯冷却凝固过程,夹杂物发生转变,连铸坯表层冷却速度快,相转变来不及发生,夹杂物成分与中间包钢水中相差不大。连铸坯内弧1/4处夹杂物转变为CaS和MnS包裹镁铝尖晶石的结构,忽略MnS归一化后的平均成分为56.00%Al2.3-9.2.%cao-9.07%MgO-2..06%CaS-0.58%SiO2.从连铸坯边部到中心,夹杂物Al2.3和CaS含量显著升高,cao含量显著降低,夹杂物中硫化物面积分数从边部的0.00001%升高至中心的0.002.%,表明硫化物在连铸坯冷却凝固过程中大量析出。采用Factsage 7.0热力学软件计算了Q345钢冷却凝固过程夹杂物的转变,结果与夹杂物检测结果变化趋势一致,且小尺寸夹杂物因动力学上转变更充分而与计算结果更接近。

关键词： Q345钢夹杂物冷却凝固析出

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