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INTERNAL STRESS MECHANISM OF CARBON TRANSMISSION UNDER HIGH TEMPERATURE AND HIGH PRESSURE

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Journal of Central South University 1998年第2期10卷 17-19页

作者： jianhong yi Qiang Li Lianlong Zou 1. The National Key Laboratory for Powder Metallurgy Central South University of Technology 410083 Changsha China

The problem was found that the nucleation and growth of diamond are different on each side of flaky catalyst in the cubic high pressure diamond synthesis system. Some theories explainning this difference were introduced in the paper. The synthesis cavity and the forces on flaky ctalyst were analysed. The results show that the stress makes the transmission velocity of carbon different on each side of catalyst slice, which causes the difference of nucleation density of diamond between two sides of the slice.

关键词： carbon transmission nucleation density gravity effect colloid theory internal stress mechanism

PROCESS　CHARACTERISTICS　OF　HoBa₂Cu₃O_7－δ　AND　EFFECT　OF　MAGNETIC　FIELD　ON　SUPERCONDUCTIVITY　OF　REBa₂Cu₃O_7－δ　（RE＝Y，Ho）

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中国有色金属学会会刊：英文版 1995年第2期5卷 101-105页

作者： yi, jianhong Peng, Chaoqun Shu, Yongchun Lin, Caidong Xu, Runze Central South Univ of Technology Changsha China

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关键词： superconductor REBa2Cu3O7-δ magnetic field pressing magnetic field sintering

Photo-thermal synergistic excitation:Feasible strategy to detect ethanol for wide bandgap ZIF-8at low work temperature

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Journal of Environmental Sciences 2024年第4期138卷 112-120页

作者： Shuhao Shi Qian Du Ming Hou Xiaolei Ye Li Yang Shenghui Guo jianhong yi Ullah Ehsan Hongbo Zeng State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China Department of Chemical and Materials Engineering University of AlbertaEdmonton T6G 2V4Canada FEMTO-ST Institute(UMR CNRS 6174) Universite de Bourgogne Franche-Comte(UBFC)Universite de technologie de Belfort Montbéliard(UTBM)Site de MontbeliardBelfort F-90010France Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Zeolitic Imidazolate Framework-8(ZIF-8)material was prepared by chemical precipitation *** microstructure and physical properties of the as-prepared samples were characterized by XRD,BET,FESEM and UV *** self-made four-channel measurement device was used to test the gas sensitivity of ZIF-8 material toward ethanol gas under photo-thermal synergistic *** results showed that the sample was typical ZIF-8(E_(g)=4.96 eV)with a regular dodecahedron shape and the specific surface is up to 1793 m^(2)/*** as-prepared ZIF-8 has a gas response value of 55.04 to 100 ppm ethanol at 75℃ and it shows good gas sensing selectivity and repeated *** excellent gas sensitivity can be attributed to the increase of free electron concentration in the ZIF-8 conduction band by photo-thermal synergistic excitation,and the large specific surface area of ZIF-8 material provides more active sites for gas-solid surface *** reaction mechanism of ZIF-8 material under multi-field excitation was also discussed.

关键词： ZIF-8 material Photo-thermal synergistic excitation UV-light irradiation Photon-generated electron and hole Gas-sensitive property

Rethinking about the Formulae of the Relationship between Euler Angles and Texture

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Journal of Harbin Institute of Technology(New Series) 2021年第5期28卷 70-77页

作者： Liangwei Chen Yuyu Hui Lan Yu Jin Hu jianhong yi School of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina

The formulae of the relationships between Euler angles and texture are important for the orientation distribution functions of research *** present,it is found that the formulae for the orthogonal and hexagonal crystal structure proposed by Roe and Bunge are not in accord with the normal direction(ND)being perpendicular to the rolling direction(RD).In this paper,these formulae are deduced independently according to the notations proposed by Roe and *** results show that in addition to the coincidence with the formulae for the cubic crystal structure given by the Roe and Bunge,the other formulae are different from Roe’s and Bunge’*** new formulae are in accord with ND,RD,and transverse direction(TD)at right angles.

关键词： texture Euler space Bunge notation Roe notation orientation distribution function

Synthesis of high grade octahedron diamond through epitaxial growth

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中国有色金属学会会刊：英文版 1999年第3期9卷 477-480页

作者： yi jianhong(易建宏) National Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, P.R. China Cent S Univ Technol Natl Key Lab Powder Met Changsha 410083 Peoples R China

The work was based on the relationship between the crystal structure and parameters of diamonds in the synthetic process, in which Ni Mn C powder catalyst was used. At first, the diamond crystals nucleated in a cubic octahedron morphology through controlling such synthetic parameters as temperature and pressure in a parameter region where cubic octahedron ctystals can be obtained. Then the diamond nuclei grew epitaxially into crystals with a perfect octahedron morphology through increasing the synthesis temperature and decreasing the synthesis pressure in a parameter region where octahedron crystals can be obtained.

关键词： high grade diamond eqitaxial growth

Real-time evolution of up-conversion nanocrystals from tailored metastable intermediates

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Nano Research 2023年第1期16卷 1552-1557页

作者： Peng Zhang Xue Yu Ping Xia Zhenzhen Cui jianhong yi Caiju Li Peng Song Feng Zhao Ting Wang Jianbei Qiu Xuhui Xu Faculty of Materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan ProvinceKunming University of Science and TechnologyKunming 650093China Yunnan AFPN Technology Company Limited Kunming 650093China School of Mechanical Engineering Institute for Advanced StudyInstitute for Advanced Materials Deformation and Damage from Multi-ScaleChengdu UniversityChengdu 610106China College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China

In-situ observation of the growth and decomposition processes is significantly important for guiding the fabrication of upconversion nanocrystals(UCNCs)with high ***,the high crystallization energy and rapid nucleation rate of the corresponding crystals make real-time observation still a huge ***,the in-situ nucleation-growth-degradation processes of the UCNCs are investigated by employing tailored metastable intermediates,which possess a slowing-down nucleation rate under electron beam *** non-classical nucleation processes of the UCNCs,containing the coalescence of clusters and the subsequent crystallization,are ***,the Ostwald ripening and oriented attachment processes,which determine the particle size and morphology,are unambiguously ***,the degrading process of the UCNCs is observed to be triggered by surface *** work provides an insight into the real-time evolution dynamics of the UCNCs,which further sheds light on the fabrication of nano-sized up-conversion phosphors.

关键词： up-conversion nanocrystals metastable intermediates real-time evolution in-situ transmission electron microscopy(TEM)

Lewis base multisite ligand engineering in efficient and stable perovskite solar cells

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Journal of Energy Chemistry 2024年第12期99卷 277-291页

作者： Danqing Ma Dongmei He Qing Zhu Xinxing Liu Yue Yu Xuxia Shai Zhengfu Zhang Sam Zhang Jing Feng jianhong yi Jiangzhao Chen Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) College of Optoelectronic EngineeringChongqing UniversityChongqing 400044China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina Institute of Physical and Engineering Science/Faculty of Science Kunming University of Science and TechnologyKunming 650500YunnanChina School of Aeronautics Harbin Institute of TechnologyHarbin 150001HeilongjiangChina HIT Zhengzhou Research Institute Zhengzhou 450000HenanChina

Perovskite solar cells(PSCs) have stood out from many photovoltaic technologies due to their flexibility,cost-effectiveness and high-power conversion efficiency(PCE). Nevertheless, the further development of PSCs is greatly hindered by the trap-induced non-radiative recombination losses and poor long-term work stability. In the past decade, the huge advancements have been obtained on suppressing nonradiative recombination and enhancing device durability. Among them, the multisite ligands(MSLs) engineering plays a crucial role in precise control and directional modification of functional layers and interfaces,which contributes to markedly increased PCE and lifetimes of PSCs. In view of this, this review summarizes the advances of MSLs in PSCs. From the perspective of functional groups and chemical interaction,the modulation mechanisms of properties of different functional layers and interfaces and device performance via various MSLs are deeply investigated and revealed. Finally, the prospects for the application and development direction of MSLs in PSCs are legitimately proposed.

关键词： Perovskite solar cells Multisite ligands Defect passivation Ion migration suppression Stability

Warm Compaction Process of P/M Steels by Orthogonal Testing Method

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Journal of Wuhan University of Technology(Materials Science) 2008年第1期23卷 105-108页

作者：叶途明 yi jianhong PENG Yuandong XIA Qinglin WANG Hongzhong State Key Laboratory for Powder Metallurgy Central South University Changsha 410083 China No.1 Steelmaking Plant Wuhan Iron and Steel Corporation Wuhan 430083 China

In order to achieve higher density of P/M steels using the die wall lubrication compacting method or powder lubricant in warm compaction process, the influence of different process parameters on the green density of warm compacted samples was studied. According to the orthogonal test method, the authors systematically study the influence of the different compaction pressure, condition of lubrication and compaction temperature on the green density of the sample in the warm compaction process, and put forward the optimal process parameter of warm compaction experiment. It is found that, a high compaction pressure （≥700 MPa）, die wall lubrication combined with a small amount of internal lubricants, and fitting compaction temperature by different condition of lubrication, are the optimal parameters in warm compaction process.

关键词： warm compaction orthogonal test method die wall lubrication particle rearrangement plastic deformation

Modification of LiMn_(0.6)Fe_(0.4)PO_(4)lithium-ion battery cathode materials with a fluorine-doped carbon coating

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Particuology 2024年第9期92卷 278-287页

作者： Debao Pan Ziyuan Liu Chengping Li Rundong Wan Jinsong Wang Jiangzhao Chen Ding Wang Jinkun Liu yingjie Zhang jianhong yi Rui Bao Zhengfu Zhang Peng Dong Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China

In this study,glucose and NH4F were utilized as sources of carbon and fluorine,respectively,for the synthesis of LiMn_(0.6)Fe_(0.4)PO_(4)(LMFP)*** nanoscales were subsequently modified with varying levels of fluorine-doped carbon through co-precipitation and mechanical ball milling *** LMFP,incorporating carbon and varying levels of fluoride ions,exhibit higher specific discharge capacities at 0.2 Cand electrochemical characteristics compared to the original LMFP coated solely with *** inclusion of fluorine-doped carbon in the composite material creates numerous pathways for expeditious electron ***,the partial formation of metal fluoride at the interface between the surface of LMFP and the layer of carbon coating doped with fluorine enhances the reduction in the charge-transfer *** modified ferromanganese phosphate cathode material reveals an outstanding discharge capacity displaying a reversible discharge specific capacity value of 131.73 mA h g^(−1)at 10C and 154.6 mA h g^(−1)at 0.2C,due to its unique structure.

关键词： Lithium manganese iron phosphate Anode Electrochemical Fluorine-doped carbon