期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
Electron density distribution of LiMn_(2)O_(4)cathode investigated by synchrotron powder x-ray diffraction 被引量:1
1
作者 Tongtong Shang Dongdong Xiao +3 位作者 Qinghua Zhang Xuefeng Wang Dong Su Lin Gu 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第7期89-92,共4页
Electron density plays an important role in determining the properties of functional materials.Revealing the electron density distribution experimentally in real space can help to tune the properties of materials.Spin... Electron density plays an important role in determining the properties of functional materials.Revealing the electron density distribution experimentally in real space can help to tune the properties of materials.Spinel Li Mn2 O4 is one of the most promising cathode candidates because of its high voltage,low cost,and non-toxicity,but suffers severe capacity fading during electrochemical cycling due to the Mn dissolution.Real-space measurement of electron distribution of Li Mn2 O4 experimentally can provide direct evaluation on the strength of Mn–O bond and give an explanation of the structure stability.Here,through high energy synchrotron powder x-ray diffraction(SPXRD),accurate electron density distribution in spinel Li Mn2 O4 has been investigated based on the multipole model.The electron accumulation between Mn and O atoms in deformation density map indicates the shared interaction of Mn–O bond.The quantitative topological analysis at bond critical points shows that the Mn–O bond is relatively weak covalent interaction due to the oxygen loss.These findings suggest that oxygen stoichiometry is the key factor for preventing the Mn dissolution and capacity fading. 展开更多
关键词 lithium-ion batteries LiMn_(2)O_(4) electron density distribution
原文传递
Research of Trap and Electron Density Distributions in the Interface of Polyimide/Al2O3 Nanocomposite Films Based on IDC and SAXS
2
作者 Yuan-Yuan Liu Jing-Hua Yin +4 位作者 Xiao-Xu Liu Duo Sun Ming-Hua Chen Zhong-Hua Wu Bo Su 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第4期116-119,共4页
The distributions of traps and electron density in the interfaces between polyimide (PI) matrix and Al2O3 nanoparticles are researched using the isothermal decay current and the small-angle x-ray scattering (SAXS)... The distributions of traps and electron density in the interfaces between polyimide (PI) matrix and Al2O3 nanoparticles are researched using the isothermal decay current and the small-angle x-ray scattering (SAXS) tests. According to the electron density distribution for quasi two-phase mixture doped by spherical nanoparticles, the electron densities in the interfaces of PI/Al2O3 nanocomposite films are evaluated. The trap level density and carrier mobility in the interface are studied. The experimental results show that the distribution and the change rate of the electron density in the three layers of interface are different, indicating different trap distributions in the interface layers. There is a maximum trap level density in the second layer, where the maximum trap level density for the nanocomposite film doped by 25 wt% is 1.054 × 10^22 eV·m^-3 at 1.324eV, resulting in the carrier mobility reducing. In addition, both the thickness and the electron density of the nanocomposite film interface increase with the addition of the doped Al2O3 contents. Through the study on the trap level distribution in the interface, it is possible to further analyze the insulation mechanism and to improve the performance of nano-dielectric materials. 展开更多
关键词 AI PI Research of Trap and electron density distributions in the Interface of Polyimide/Al2O3 Nanocomposite Films Based on IDC and SAXS IDC Al
原文传递
Electron Momentum Distributions for 4a1 Orbitals of CFxCl4-x in Low Momentum Region: a Possible Evidence of Molecular Geometry Distortion
3
作者 Xu Shan Chun-kai Xu +3 位作者 Xiao-feng Yin Li-xia Zhou Ke-zun Xu Xiang-jun Chen 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2009年第6期642-648,J0002,共8页
Electron momentum distributions for 4a1 orbitals of serial freon molecules CFaC1, CF2Cl2, and CFCl3 (CFxC14-x, x=1-3) have been reanalyzed due to the severe discrepancies between theory and experiment in low momentu... Electron momentum distributions for 4a1 orbitals of serial freon molecules CFaC1, CF2Cl2, and CFCl3 (CFxC14-x, x=1-3) have been reanalyzed due to the severe discrepancies between theory and experiment in low momentum region. The tentative calculations using equilibrium geometries of molecular ions have exhibited a great improvement in agreement with the experimental data, which suggests that the molecular geometry distortion may be responsible for the observed high intensities at p〈0.5 a.u.. Further analyses show that the severe discrepancies at low momentum region mainly arise from the influence of molecular geometry distortion on C-Cl bonding electron density distributions. 展开更多
关键词 (e 2e) electron momentum spectroscopy Molecular geometry distortion electron density distribution
下载PDF
Three-Dimensional Modeling of Argon Discharge Characteristics of a Large-Scale Rectangular Surface-Wave Plasma Source 被引量:1
4
作者 蓝朝晖 胡希伟 +1 位作者 王文斗 刘明海 《Plasma Science and Technology》 SCIE EI CAS CSCD 2010年第2期129-133,共5页
A three-dimensional fluid model for surface-wave plasma (SWP), to investigate the discharge characteristics of a rectangular SWP source working in a steady state, was presented. The simulation is performed for diffe... A three-dimensional fluid model for surface-wave plasma (SWP), to investigate the discharge characteristics of a rectangular SWP source working in a steady state, was presented. The simulation is performed for different gas pressures in argon and different deposited powers. The results showed that there is a peak of plasma density at a distance of 2 cm to 3 cm from the plasma-quartz interface whose position depends mainly on the gas pressure but not the deposited power. The spatial distributions of plasma parameters and their dependence on the gas pressure and deposited power are also presented and discussed. Using this model a good agreement between the simulation results and the available experimental data is obtained. 展开更多
关键词 surface wave plasma electron density distribution electron temperature distribution
下载PDF
Methyl orbital signatures in 2-amino-1-propanol
5
作者 王克栋 段坤杰 刘玉芳 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第7期235-240,共6页
Electron density distributions of 2-aminoethanol (2AE) and 2-amino-l-propanol (2AP) are calculated in both the coordinate and the momentum spaces using the B3LYP/TZVP method. Using the dual space analysis, molecul... Electron density distributions of 2-aminoethanol (2AE) and 2-amino-l-propanol (2AP) are calculated in both the coordinate and the momentum spaces using the B3LYP/TZVP method. Using the dual space analysis, molecular orbital signatures of the methyl substituent in 2AP are identified with respect to 2AE. Relaxations of the geometry and the valence orbital in 2AP are found to be due to the insertion of the methyl group. Five orbitals, not four orbitals, are identified as the methyl signatures. They are orbital 5a in the core shell, orbitals 9a and 10a in the inner valence shell, and orbitals 15a and 16a in the outer valence. In the inner valence shell, the attachment of methyl to 2AE causes a splitting of its orbital 8a into orbitals 9a and 10a of 2AP, whereas in the outer valence shell, the methyl group results in the insertion of an additional orbital pair of 15a and 16a. The frontier molecular orbitals 21a, 20a, and 19a are found to have no significant role in the methylation of 2AE. 展开更多
关键词 electron density distribution orbital signature of methyl molecular orbital
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部