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Is the Crystalline Lattice Structure in Nanocrystalline Materials Different from the Perfect Crystal Lattice? 被引量:3
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作者 Ke LU National Key Laboratory for RSA,Institute of Metal Research,Academia Sinica,Shenyang,110015,ChinaManling SUI Department of Materials Science and Engineering,Northeastern University,Shenyang 110006,China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1993年第6期419-422,共4页
A thermodynamic analysis of the ultrafine crystallites in nanocrystalline materials was presented in this work.It was deduced that the structure of the nm-sized crystalline grains is different from the perfect crystal... A thermodynamic analysis of the ultrafine crystallites in nanocrystalline materials was presented in this work.It was deduced that the structure of the nm-sized crystalline grains is different from the perfect crystal lattice,characterized by two possible structure changes;supersaturation of alloy ele- ments and crystal lattice distortion resulted from supersaturation of vacancies.Some experimental ev- idences in the literature,which are in agreement of the thermodynamic consideration,indicate that the structure changes in the nm-sized crystallite seems to be a consequential feature of the nanocrystalline materials. 展开更多
关键词 nanocrystalline materials crystal lattice THERMODYNAMICS
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Effect of Roasting Conditions of Rich Cerium Rare Earth Carbonate on Crystallite Morphology and Polishing Ability of Ceria-Based Rare Earth Oxide 被引量:2
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作者 吴文远 李学舜 +2 位作者 陈杰 杨国胜 涂赣峰 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第S1期125-128,共4页
The granule shape and crystal structure of the the ceria-based rare earth oxide which were roasted at 600~1050 ℃ for 2~6 h and then cooled in furnace, cooled out of furnace or cooled in water were studied by means ... The granule shape and crystal structure of the the ceria-based rare earth oxide which were roasted at 600~1050 ℃ for 2~6 h and then cooled in furnace, cooled out of furnace or cooled in water were studied by means of XRD and SEM. The results revealed that the rich cerium rare earth carbonate could be changed into the rare earth oxide which was a kind of sandwich made of globose granule whose diameter was between 0.5~3.0 μm after being roasted in 900 ℃ for 2 h. This kind of crystal lattice in rare earth oxide belonged to face-centered cubic lattice and its space between crystal surface {111} and {200} (viz. L111 and L200) would enlarge as the roasting temperature increasing. With increasing roasting temperature, L111 would rise straightly upward, and L200 would rise straightly upward when roasting time was 2~4 h but changed little when roasting time was 4~6 h. The glass-polishing experiments found that the polishing ability of the ceria-based rare earth oxide was the best as L111 was 43~53 nm and the L200 was 43~56 nm. 展开更多
关键词 polishing powder ceria-based rare earth oxide crystal lattice polishing ability rare earths
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IMPROVEMENT ON THE CALCULATION OF PLASTIC STRAIN RATIO IN BCC MONOCRYSTALS
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作者 ZHAO Xiang, LIU Yansheng, XU Jiazhen, LIANG ZhideNortheastern University, Shenyang, ChinaKONG Bingyu, MI XiaochuanBaoshan Iron and Steel Company, Shanghai, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1994年第1期65-67,共3页
Two improvements have been made on the calculation of plastic strain ratio (r value) in BCC monocrystals by considering the differences in the critical shear stresses among the three slip systems and the rotation of c... Two improvements have been made on the calculation of plastic strain ratio (r value) in BCC monocrystals by considering the differences in the critical shear stresses among the three slip systems and the rotation of crystal lattice. It is found that the results calculated by the improved method are more rational. 展开更多
关键词 plastic strain ratio critical shear stress rotation of crystal lattice Taylor factor
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NANO-MOIRE METHOD 被引量:4
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作者 戴福隆 邢永明 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 1999年第3期283-288,共6页
Nano-moiré method presented in this paper is an experimental technique which allows direct measurement of nanoscopic mechanical parameters, such as displacement, strain and dislocation distribution. The basic ide... Nano-moiré method presented in this paper is an experimental technique which allows direct measurement of nanoscopic mechanical parameters, such as displacement, strain and dislocation distribution. The basic idea is the formation of moiré fringes when a HREM (high resolution electron microscopy) image of crystal material is superimposed with a unidirectional grating. Fourier filtering technique is used to increase the contrast of fringes and to multiple the fringes. This method has atom-size sensitivity and spatial resolution, and relatively large range. It provides a new experimental technique with very high sensitivity and spatial resolution for nanomechanics. 展开更多
关键词 Nano-moiré crystal lattice nano-deformation experimental moiré
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THEORY OF NONLOCAL ASYMMETRIC ELASTIC SOLIDS 被引量:1
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作者 高键 陈至达 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1992年第9期793-804,共12页
In this paper, a nonlinear theory of nonlocal asymmetric, elastic solids is developed on the basis of basic theories of nonlocal continuum field theory and nonlinear continuum mechanics. It perfects and expands the no... In this paper, a nonlinear theory of nonlocal asymmetric, elastic solids is developed on the basis of basic theories of nonlocal continuum field theory and nonlinear continuum mechanics. It perfects and expands the nonlocal elastic field theory developed by Eringen and others. The linear theory of nonlocal asymmetric elasticity developed in [1] expands to the finite deformation. We show that there is the nonlocal body moment in the nonlocal elastic solids. The nonlocal body moment causes the stress asymmetric and itself is caused by the covalent bond formed by the reaction between atoms. The theory developed in this paper is applied to explain reasonably that curves of dispersion relation of one-dimensional plane longitudinal waves are not similar with those of transverse waves. 展开更多
关键词 Continuum mechanics crystal lattices DEFORMATION Dispersion (waves) Elastic waves Mathematical models SOLIDS Stresses
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Substitution Process and Valent State of Samarium Ion in Perovskite Binary Fluorides
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作者 曾志成 石春山 倪嘉缵 《Journal of Rare Earths》 SCIE EI CAS CSCD 1993年第2期98-101,共4页
The lattice sites occupied by samarium ions in KMgF3 were ascertained. The relationship between valent state of samarium ion in hosts and substituted lattice sites was investigated using fluorescent spectra. It is fou... The lattice sites occupied by samarium ions in KMgF3 were ascertained. The relationship between valent state of samarium ion in hosts and substituted lattice sites was investigated using fluorescent spectra. It is found that the valent state of samarium in different cationic lattice sites is different. The internal relation between the valent state of samarium ion and occupied lattice site was discussed. 展开更多
关键词 crystal lattices Electron energy levels Emission spectroscopy FLUORESCENCE Fluorine compounds IONS PEROVSKITE
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Effects and Mechanism of Titanium Modification on Structures of Cast Steel ZG270-500
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作者 王海涛 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第4期634-639,共6页
The influences of titanium modification on the solidification behavior, shrinkage characteristic and primary austenite refinement of cast steel ZG270-500 smelted in intermediate frequency induction furnace were studie... The influences of titanium modification on the solidification behavior, shrinkage characteristic and primary austenite refinement of cast steel ZG270-500 smelted in intermediate frequency induction furnace were studied. 0.15wt% titanium modification increased the fluidity of the steel liquid, enhanced the feeding capacity of cast steel, changed the dispersed shrinkage porosity to concentrated shrinkage cavity, turned the coarse dendrites into fine equiaxed grain structures and greatly reduced the primary austenite grain size. By scanning electron microscope (SEM) and energy disperse spectroscope (EDS) analysis, it was found that titanium combined with carbon to be solid phase particles TiC, with high melting point, to promote the primary austenite nucleation authentically by non-spontaneous nucleating. The crystal lattice match growing model between γ–Fe and TiC was established. The mechanism of TiC heterogeneous nucleating existed in that the primary austenite grew up by {111}γ-Fe parallel to the closest packed plane {111}TiC in the crystal orientation 110γ-Fe//211TiC. The crystal planes mismatch and the lowest orientation mismatchδ110γ-Fe 110TiC were 8.18%. and 2.25% respectively, almost achieving complete coherent lattice match growing of austenite on TiC. 展开更多
关键词 MODIFICATION TITANIUM AUSTENITE heterogeneous nucleation crystal lattice match
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Compact triplexer in two-dimensional hexagonal lattice photonic crystals
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作者 任宏亮 马建平 +5 位作者 温浩 覃亚丽 吴哲夫 胡卫生 姜淳 金耀辉 《Chinese Optics Letters》 SCIE EI CAS CSCD 2011年第4期87-90,共4页
We design a compact triplexer based on two-dimensional (2D) hexagonal lattice photonic crystals (PCs). A folded directional coupler (FDC) is introduced in the triplexer beside the point-defect micro-cavities and... We design a compact triplexer based on two-dimensional (2D) hexagonal lattice photonic crystals (PCs). A folded directional coupler (FDC) is introduced in the triplexer beside the point-defect micro-cavities and line-defect waveguides. Because of the reflection feedback of the FDC, high channel drop efficiency can be realized and a compact size with the order of micrometers can be maintained. The proposed device is analyzed using the plane wave expansion method, and its transmission characteristics are calculated using the finite-difference time-domain method. The footprint of the triplexer is about 12 9 μm, and its extinction ratios are less than -20 dB for 1310 nm, approximately -20 dB for 1490 nm, and under -40 dB for 1550 nm, making it a potentially essential device in future fiber-to-the-home networks. 展开更多
关键词 crystal lattices DEFECTS Fiber optic networks Finite difference time domain method Multiplexing equipment Optical waveguides Personal communication systems Time domain analysis Two dimensional
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Microstructure and Transformation on Platinum (111) Facets
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作者 汪连山 洪汉烈 李宗全 《Rare Metals》 SCIE EI CAS CSCD 1996年第1期45-50,共6页
The microstructures of platinum (111) facets were studied by reflection electron microscopy, and the features on facets, for example, growth steps, slip steps, and dislocations emerging through the surfaces, etc., wer... The microstructures of platinum (111) facets were studied by reflection electron microscopy, and the features on facets, for example, growth steps, slip steps, and dislocations emerging through the surfaces, etc., were analysed. In the following annealing at about 1100°C for 1 h in the atmosphere, the migration of crystal surface atoms resulted in the transformation of stepped configuration on (111) facets. Differently high and sized 〈111〉 terraces or small planes distributed on facets constructed frustum structures. 展开更多
关键词 crystal growth crystal lattices lattice constants MICROSTRUCTURE Phase transitions
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Hyperfullerenes
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作者 Tatyana Alekseevna Shabanova V.A. Glagolev Z.A. Mansurov 《Journal of Chemistry and Chemical Engineering》 2012年第11期989-996,共8页
The different fullerite structures were obtained. Individual of hyperfullerene which duplicate the form of fullerene was fixed. The attempt of transcript of these structures for electron microscopy is going on.
关键词 Fullerene soot FULLERENE FULLERITE a crystal lattice parameters.
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Influence of Tb on easy magnetization direction and magnetostriction of ferromagnetic Laves phase GdFe_2 compounds 被引量:2
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作者 Adil Murtaza 杨森 +1 位作者 周超 宋晓平 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期452-457,共6页
The crystal structure,magnetization,and spontaneous magnetostriction of ferromagnetic Laves phase Gd Fe2 compound have been investigated.High resolution synchrotron x-ray diffraction(XRD) analysis shows that Gd Fe2 ... The crystal structure,magnetization,and spontaneous magnetostriction of ferromagnetic Laves phase Gd Fe2 compound have been investigated.High resolution synchrotron x-ray diffraction(XRD) analysis shows that Gd Fe2 has a lower cubic symmetry with easy magnetization direction(EMD) along [100] below Curie temperature TC.The replacement of Gd with a small amount of Tb changes the EMD to [111].The Curie temperature decreases while the field dependence of the saturation magnetization(Ms) measured in temperature range 5–300 K varies with increasing Tb concentration.Coercivity Hc increases with increasing Tb concentration and decays exponentially as temperature increases.The anisotropy in Gd Fe2 is so weak that some of the rare-earth substitution plays an important role in determining the easy direction of magnetization in GdFe_2.The calculated magnetostrictive constant λ100 shows a small value of 37×10^(-6).This value agrees well with experimental data 30×10^(-6).Under a relatively small magnetic field,GdFe_2 exhibits a V-shaped positive magnetostriction curve.When the field is further increased,the crystal exhibits a negative magnetostriction curve.This phenomenon has been discussed in term of magnetic domain switching.Furthermore,magnetostriction increases with increasing Tb concentration.Our work leads to a simple and unified mesoscopic explanation for magnetostriction in ferromagnets.It may also provide insight for developing novel functional materials. 展开更多
关键词 crystal structure magnetic anisotropy lattice distortion magnetostriction
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Design and analysis of superlens based on complex two-dimensional square lattice photonic crystal 被引量:2
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作者 Somayeh Rafiee Dastjerdi Majid Ghanaatshoar Toshiaki Hattori 《Chinese Optics Letters》 SCIE EI CAS CSCD 2013年第10期83-86,共4页
We theoretically demonstrate the imaging properties of a complex two-dimensional(2D) face-centered square lattice photonic crystal(PC) made from germanium cylinders in air background. The finitedifference time-domain(... We theoretically demonstrate the imaging properties of a complex two-dimensional(2D) face-centered square lattice photonic crystal(PC) made from germanium cylinders in air background. The finitedifference time-domain(FDTD) method is employed to calculate the band structure and simulate image construction. The band diagram of the complex structure is significantly compressed. Negative refraction occurs in the second energy band with negative phase velocity at a frequency of 0.228(2πc/a), which is lower than results from previous studies. Lower negative refraction frequency leads to higher image resolution. Numerical results show that the spatial resolution of the system reaches 0.7296λ, which is lower than the incident wavelength. 展开更多
关键词 Design and analysis of superlens based on complex two-dimensional square lattice photonic crystal
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Photonic band gap of 2D complex lattice photonic crystal 被引量:1
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作者 关春颖 苑立波 《Optoelectronics Letters》 EI 2009年第2期120-123,共4页
It is of great significance to present a photonic crystal lattice structure with a wide photonic bandgap. A two-dimension complex lattice photonic crystal is proposed. The photonic crystal is composed of complex latti... It is of great significance to present a photonic crystal lattice structure with a wide photonic bandgap. A two-dimension complex lattice photonic crystal is proposed. The photonic crystal is composed of complex lattices with triangular structure, and each single cell is surrounded by six scatterers in an hexagon. The photonic band gaps are calculated based on the plane wave expansion (PWE) method. The results indicate that the photonic crystal has tunable large TM polarization band gap, and a gap-midgap ra... 展开更多
关键词 Cell membranes crystal structure Energy gap Optical devices Photonic crystals Band gaps lattice photonic crystals Midgap ratio Plane wave expansion method Single cells TM polarization Triangular structures Two DIMENSION
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Ultrasonic generation via direct interaction between photons and phonons in anharmonic lattice of ionic crystals
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作者 OU Fa (Department of Applied Physics, South China University of Technology Guangzhou 510641) WU Fugen HE Minggao (Physics Department, Guangdong University of Technology Guangzhou 510090) LIU Cuihong (Physics Department, Guangzhou Teachers’College Guangzh 《Chinese Journal of Acoustics》 2000年第2期182-191,共10页
A theory of ultrasonic generation via direct interaction of transverse optic (TO) phonons with photons in anharmonic lattice of ionic crystals is presented. There are two methods of supplying light energy for the exci... A theory of ultrasonic generation via direct interaction of transverse optic (TO) phonons with photons in anharmonic lattice of ionic crystals is presented. There are two methods of supplying light energy for the excitation of TO lattice wave as a high frequency ultrasound: (A) incident light comes from the source outside the cavity? fulfilled with ionic crystal medium, (B) photon mode of the cavity possesses the gain of amplification by stimulated radiation of active atoms doping in the medium. More attention is drawn to the case (B). The working system of case (B), as a mixture of lasing action and ultrasonic generation, has the threshold phenomena like usual laser. And the linear stability analysis shows that the nonlineax phonon-photon coupling and the interaction among phonons themselves, both of which reflect the anharmonicity of lattice vibration, are necessary to the stable ultrasonic output. So this laser-ultrasonic generation mixture would be also a measure to investigate the lattice-dynamic nonlinearity and correlated electromagnetic properties of ionic crystals. 展开更多
关键词 Ultrasonic generation via direct interaction between photons and phonons in anharmonic lattice of ionic crystals mode
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Nanocrystal Model for Liquid Metals and Amorphous Metals 被引量:7
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作者 X.L. Tian, C.W. Zhan, J.X. Hou, X.C. Chen and J.J. Sun Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan 250061, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2010年第1期69-74,共6页
A nanocrystal model for liquid metals and amorphous metals has been developed. With the nanocrystal model, the broadening peak profiles (BPPs) of Cu, Al, Al65Cu20Fe15 alloy, Cu7oNi30 alloy and Fe50Si50 alloy were ga... A nanocrystal model for liquid metals and amorphous metals has been developed. With the nanocrystal model, the broadening peak profiles (BPPs) of Cu, Al, Al65Cu20Fe15 alloy, Cu7oNi30 alloy and Fe50Si50 alloy were gained by broadening the X-ray diffraction (XRD) peaks of a crystal lattice. By comparing the BPPs with the XRD intensity curves measured on the liquid metals, it is found that the BPPs are closely in agreement with the XRD intensity curves, respectively, except the FesoSiso alloy. Therefore, the nanocrystal model can be used to determine if the atomic cluster structure of the liquid metal is similar to the structure of its crystal lattice. 展开更多
关键词 Liquid metal Atomic cluster STRUCTURE crystal lattice
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Automatic Measurement of Silicon Lattice Spacings in High-Resolution Transmission Electron Microscopy Images Through 2D Discrete Fourier Transform and Inverse Discrete Fourier Transform 被引量:4
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作者 Fang Wang Yushu Shi +2 位作者 Shu Zhang Xixi Yu Wei Li 《Nanomanufacturing and Metrology》 EI 2022年第2期119-126,共8页
Line width(i.e.,critical dimension,CD)is a crucial parameter in integrated circuits.To accurately control the CD in manufacturing,a reasonable CD measurement algorithm is required.We develop an automatic and accurate ... Line width(i.e.,critical dimension,CD)is a crucial parameter in integrated circuits.To accurately control the CD in manufacturing,a reasonable CD measurement algorithm is required.We develop an automatic and accurate method based on a two-dimensional discrete Fourier transform for measuring the lattice spacings from high-resolution transmission electron microscopy images.Through the two-dimensional inverse discrete Fourier transform of the central spot and a pair of symmetrical diffraction spots,an image containing only a set of lattice spacings is obtained.Then,the pixel span of the lattice spacing is calculated through the centre of gravity method.Finally,we estimate the standard CD value according to the half-intensity method.The silicon crystal lattice constant guarantees the accuracy and traceability of the CD value.Through experiments,we demonstrate the efficiency of the proposed method,which can be conveniently applied to accurately measure CDs in practical applications. 展开更多
关键词 Transmission electron microscopy Line width crystal lattice constant TRACEABILITY
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Pulse loading ^(87)Rb Bose-Einstein condensation in optical lattice:the Kapitza-Dirac scattering and temporal matter-wave-dispersion Talbot effect
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作者 陈海霞 熊德智 +1 位作者 王鹏军 张靖 《Chinese Optics Letters》 SCIE EI CAS CSCD 2010年第4期348-350,共3页
We study ^(87)Rb Bose-Einstein condensation(BEC) loading into the pulse of the one-dimensional(1D) optical lattice experimentally.The lattice is turned on abruptly,held constant for a variable time,and then turn... We study ^(87)Rb Bose-Einstein condensation(BEC) loading into the pulse of the one-dimensional(1D) optical lattice experimentally.The lattice is turned on abruptly,held constant for a variable time,and then turned off abruptly.The measurement of the depth of the optical lattice is obtained by Kapitza-Dirac scattering.The temporal matter-wave-dispersion Talbot effect with ^(87)Rb BEC is observed by applying a pair of pulsed standing waves(as pulsed phase gratings) with the separation of a variable delay. 展开更多
关键词 BOSE Einstein condensation CONDENSATION crystal lattices Fermi level Optical materials RUBIDIUM Sound reproduction Statistical mechanics
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Study on vibrational modes by group theory and infrared spectra by DFT for calcite crystal
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作者 楼丹花 孙凤久 李莉娟 《Chinese Optics Letters》 SCIE EI CAS CSCD 2007年第6期370-372,共3页
The factor group symmetry analysis (FSA) method and position symmetry analysis (PSA) method are used to analyze the vibrational modes of calcite (CaCO3) crystal, respectively. With the activated results of infra... The factor group symmetry analysis (FSA) method and position symmetry analysis (PSA) method are used to analyze the vibrational modes of calcite (CaCO3) crystal, respectively. With the activated results of infrared and Raman spectra presented, strong points of each method are concluded. The infrared spectra are studied by using dynamics calculations based on density-functional theory (DFT) with the supercell model of calcite crystal. The frequencies of 27 normal modes are achieved, which are consistent with that by the group symmetry analysis very well, and fit with the experimental results better than the lattice dynamical methods. 展开更多
关键词 CALCITE CALCULATIONS crystal lattices Density functional theory Raman scattering
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Raman spectra of undoped and uranium doped CaF_2 single crystals
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作者 苏良碧 徐军 +2 位作者 杨卫桥 姜雄伟 董永军 《Chinese Optics Letters》 SCIE EI CAS CSCD 2005年第4期219-221,共3页
Raman scattering experiments for nominally pure and uranium doped CaF2 single crystals were presented. In all crystals, the Raman active T2g vibration mode of CaF2 was observed, whose frequency shift and full-width at... Raman scattering experiments for nominally pure and uranium doped CaF2 single crystals were presented. In all crystals, the Raman active T2g vibration mode of CaF2 was observed, whose frequency shift and full-width at half-maximum (FWHM) broadening correspond well with defects and impurities in CaF2 lattice. Additional Raman peaks develop in nominally pure CaF2 with high etch pits density and U6+:CaF2 crystals. Part of additional Raman peaks in the experimental results, which are assumed due to vibration modes from F- interstitials and vacancies, are in well agreement with the theoretical predications by employing the Green-function formulation. 展开更多
关键词 Calcium compounds crystal defects crystal growth crystal impurities crystal lattices Fluorine compounds Frequencies Green's function Optical microscopy Raman scattering Raman spectroscopy Rare earth additions URANIUM X ray analysis
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Gap-type dark localized modes in a Bose-Einstein condensate with optical lattices 被引量:5
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作者 Liangwei Zeng Jianhua Zeng 《Advanced Photonics》 EI CSCD 2019年第4期32-41,共10页
Bose-Einstein condensate(BEC)exhibits a variety of fascinating and unexpected macroscopic phenomena,and has attracted sustained attention in recent years-particularly in the field of solitons and associated nonlinear ... Bose-Einstein condensate(BEC)exhibits a variety of fascinating and unexpected macroscopic phenomena,and has attracted sustained attention in recent years-particularly in the field of solitons and associated nonlinear phenomena.Meanwhile,optical lattices have emerged as a versatile toolbox for understanding the properties and controlling the dynamics of BEC,among which the realization of bright gap solitons is an iconic result.However,the dark gap solitons are still experimentally unproven,and their properties in more than one dimension remain unknown.In light of this,we describe,numerically and theoretically,the formation and stability properties of gap-type dark localized modes in the context of ultracold atoms trapped in optical lattices.Two kinds of stable dark localized modes-gap solitons and soliton clusters-are predicted in both the one-and two-dimensional geometries.The vortical counterparts of both modes are also constructed in two dimensions.A unique feature is the existence of a nonlinear Bloch-wave background on which all above gap modes are situated.By employing linear-stability analysis and direct simulations,stability regions of the predicted modes are obtained.Our results offer the possibility of observing dark gap localized structures with cutting-edge techniques in ultracold atoms experiments and beyond,including in optics with photonic crystals and lattices. 展开更多
关键词 Bose–Einstein condensates optical lattices photonic crystals and lattices self-defocusing Kerr nonlinearity dark gap solitons and soliton clusters
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