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Interface,lattice strain and dislocation density of SiC_p/Al composite consolidated by equal channel angular pressing and torsion

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Transactions of Nonferrous Metals Society of China 2015年第6期25卷 1744-1751页

作者：钱陈豪李萍薛克敏合肥工业大学材料科学与工程学院合肥230009

Powder mixture of pure A1 and oxidized SiC was consolidated into 10% （mass fraction） SiCp/AI composites at 523 K by equal channel angular pressing and torsion （ECAP-T）. The interfacial bonding of the composites was characterized by transmission electron microscopy （TEM） and high resolution transmission electron microscopy （HRTEM）. The selected area electron diffraction （SAED） for the interface was investigated. The elements at the interface were scanned by energy dispersive spectroscopy （EDS） and the EDS mapping was also obtained. X-ray diffraction （XRD） analysis was carried out for the composites fabricated by 1 pass, 2 passes and 4 passes ECAP-T. According to the XRD analysis, the influences of ECAP-T pass on the Bragg angle and interplanar spacing for AI crystalline planes were studied. The results show that after ECAP-T, the interface between A1 and SiC within the composites is a belt of amorphous SiO2 containing a trace of A1, Si and C which diffused from the matrix and the reinforcement. With the growing ECAP-T pass, the Bragg angle decreases and interplanar spacing increases for A1 crystalline planes, due to the accumulated lattice strain. The increasing lattice strain of A1 grains also boosts the density of the dislocation within A1 grains.

关键词： metal matrix composites severe plastic deformation interface lattice strain dislocation density

Surface chemical disorder and lattice strain of GaN implanted by 3-MeV Fe^(10+)ions

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Chinese Physics B 2022年第4期31卷 506-511页

作者： Jun-Yuan Yang Zong-Kai Feng Ling Jiang Jie Song Xiao-Xun He Li-Ming Chen Qing Liao Jiao Wang Bing-Sheng Li State Key Laboratory for Environment-friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China Sichuan Vocational and Technical College of Communications Chengdu 611130China

Chemical disorder on the surface and lattice strain in GaN implanted by Fe^(10+)ions are *** this study,3-MeV Fe^(10+)ions fluence ranges from 1×10^(13)ions/cm^(2)to 5×10^(15)ions/cm^(2)at room temperature.X-ray photoelectron spectroscopy,high-resolution x-ray diffraction,and high-resolution transmission electron microscopy were used to characterize lattice *** transition of Ga-N bonds to oxynitride bonding is caused by ion *** change of tensile strain out-of-plane with fluence was *** disorder due to the formation of stacking faults prefers to occur on the basal plane.

关键词： GaN ion implantation chemical disorder lattice strain microstructure

Tailoring lattice strain in ultra-fine high-entropy alloys for active and stable methanol oxidation

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Science China Materials 2021年第10期64卷 2454-2466页

作者： Dongdong Wang Zhiwen Chen Yu-Cheng Huang Wei Li Juan Wang Zhuole Lu Kaizhi Gu Tehua Wang Yujie Wu Chen Chen Yiqiong Zhang Xiaoqing Huang Li Tao Chung-Li Dong Jun Chen Chandra Veer Singh Shuangyin Wang State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082 Department of Materials Science and Engineering University of TorontoToronto ON M5S 3E4 College of Materials Science and Engineering Changsha University of Science&TechnologyChangsha 410114 ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute(IPRI)Australian Institute of Innovative Materials(AIIM)University of WollongongWollongong NSW 2522 Research Center for X-Ray Science&Department of Physics Tamkang UniversityNew Taipei City 25137 College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123

High-entropy alloys(HEAs)have been widely studied due to their unconventional compositions and unique physicochemical properties for various ***,for the first time,we propose a surface strain strategy to tune the electrocatalytic activity of HEAs for methanol oxidation reaction(MOR).High-resolution aberration-corrected scanning transmission electron microscopy(STEM)and elemental mapping demonstrate both uniform atomic dispersion and the formation of a face-centered cubic(FCC)crystalline structure in Pt Fe Co Ni Cu *** HEAs obtained by heat treatment at 700℃(HEA-700)exhibit 0.94%compressive strain compared with that obtained at 400℃(HEA-400).As expected,the specific activity and mass activity of HEA-700 is higher than that of HEA-400 and most of the state-of-the-art *** enhanced MOR activity can be attributed to a shorter Pt–Pt bond distance in HEA-700 resulting from compressive *** nonprecious metal atoms in the core could generate compressive strain and down shift d-band centers via electron transfer to surface Pt *** work presents a new perspective for the design of high-performance HEAs electrocatalysts.

关键词： high-entropy alloys lattice strain methanol oxidation platinum-based catalysts electrocatalysis

In-situ doping-induced lattice strain of NiCoP/S nanocrystals for robust wide pH hydrogen evolution electrocatalysis and supercapacitor

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Journal of Energy Chemistry 2022年第7期31卷 27-35,I0002页

作者： Yan Lin Xiaomeng Chen Yongxiao Tuo Yuan Pan Jun Zhang College of Energy Storage Technology Shandong University of Science and TechnologyQingdao 266590ShandongChina School of Material Science and Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580ShandongChina

Developing high-efficiency multifunctional nanomaterials is promising for wide p H hydrogen evolution reaction(HER) and energy storage but still challenging. Herein, a novel in-situ doping-induced lattice strain strategy of NiCoP/S nanocrystals(NCs) was proposed through using seed crystal conversion approach with NiCo_(2)S_(4) spinel as precursor. The small amount of S atoms in NiCoP/S NCs perturbed the local electronic structure, leading to the atomic position shift of the nearest neighbor in the protocell and the nanoscale lattice strain, which optimized the H* adsorption free energy and activated H_(2)O molecules, resulting the dramatically elevated HER performance within a wide p H range. Especially, the NiCoP/S NCs displayed better HER electrocatalytic activity than comical 20% Pt/C at high current density in 1 M KOH and natural seawater: it only needed 266 m V vs. reversible hydrogen electrode(RHE) and660 m V vs. RHE to arrive the current density of 350 m A cm^(-2) in 1 M KOH and natural seawater, indicating the application prospect for industrial high current. Besides, NiCoP/S NCs also displayed excellent supercapacitor performance: it showed high specific capacity of 2229.9 F g^(-1) at 1 A g^(-1) and energy density of87.49 Wh kg^(-1), when assembled into an all-solid-state flexible device, exceeding performance of most transition metal phosphides. This work provides new insights into the regulation in electronic structure and lattice strain for electrocatalytic and energy storage applications.

关键词： Heteroatom doping lattice strain Hydrogen evolution electrocatalysis Sea water electrocatalysis Supercapacitor

Evolution of electrical and magnetotransport properties with lattice strain in La0.7Sr0.3MnO3 film

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Chinese Physics B 2020年第9期29卷 429-434页

作者： Zhi-Bin Ling Qing-Ye Zhang Cheng-Peng Yang Xiao-Tian Li Wen-Shuang Liang Yi-Qian Wang Huai-Wen Yang Ji-Rong Sun College of Physics&State Key Laboratory Qingdao UniversityQingdao 266071China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

In this paper,we investigate the effects of lattice strain on the electrical and magnetotransport properties of La0.7Sr0.3MnO3(LSMO)films by changing film thickness and *** electrical properties,a resistivity upturn emerges in LSMO films,i.e.,LSMO/STO and LSMO/LSAT with small lattice strain at a low temperature,which originates from the weak localization *** film thickness weakens the weak localization effect,resulting in the disappearance of resistivity *** in LSMO films with a large lattice strain(i.e.,LSMO/LAO),an unexpected semiconductor behavior is observed due to the linear *** magnetotransport properties,an anomalous in-plane magnetoresistance peak(pMR)occurs at low temperatures in LSMO films with small lattice strain,which is caused by two-dimensional electron gas(2DEG).Increasing film thickness suppresses the 2DEG,which weakens the ***,it is found that the film orientation has no influence on the formation of *** in LSMO/LAO films,the 2DEG cannot form due to the existence of linear *** work can provide an efficient way to regulate the film transport properties.

关键词： LSMO film lattice strain electrical transport magnetotransport

Quantification of Compositional and Residual Stress Efects on lattice strain in Dual-phase Stainless Steels by Means of Diferential Aperture X-ray Micro-difraction

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Acta Metallurgica Sinica(English Letters) 2013年第6期26卷 663-668页

作者： Nan LI Zhinan AN Wenjun LIU Yandong WANG School of Materials Science and Engineering Beijing Institute of Technology Department of Materials Engineering the University of Tennessee Advanced Photon Source Argonne National Laboratory State Key Laboratory of Advanced Metals and Materials University of Science and Technology Beijing

Residual stress is an important factor for evaluating the deformation and failure of engineering materials. Diffraction-based measurement assumes that the full measured lattice strain tensor contributes to residual stress according to Hookers Law. The present work focuses on the lattice strain determination of individual grains in a dual-phase stainless steel （DPSS） by means of differential-aperture X-ray micro-diffraction （DAXM）. The results show that the residual stress only takes part of the responsibility of the total measured lattice strain. In fact, the compositional variation inside the material was found to cause greater strain gradient in both ferrite （c~） and austenite （~） phases in DPSS. Therefore, quantification of compositional and residual stress effects on lattice strain was conducted in order to evaluate the true residual stress inside engineering materials.

关键词： Differential aperture X-ray mico-diffraction lattice strain Residualstress Dual-phase stainless steels

A combined electrochemical and DFT study of the lattice strain effect on the surface reactivity of Pd

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Chinese Chemical Letters 2007年第10期18卷 1301-1304页

作者： You Gui Chen Lin Zhuang Jun Tao Lu Department of Chemistry Wuhan University Wuhan 430072 China

We report a combined study of electrochemical experiments and ab initio calculations on tuning the surface reactivity of Pd via a compressive lattice strain achieved by employing nanoparticles of Pd-Cu alloys with a Pd-rich surface. Surface oxygen-containing species were used as the probing molecule for revealing the surface reactivity. Both density functional theory （DFT） calculations and experiments showed linear relationships, with very close slopes, between the adsorption strength of OHads and the Pd lattice constant. Not only is this work a successful realization of controllable modulation in the surface reactivity, but it also provides valuable information for the rational design of Pd-based catalysts for fuel cell applications.

关键词： Palladium lattice strain Reactivity Density functional theory Electrocatalysis

lattice strain driven dielectric insulation response of Sr_(1-x)Ca_(x)Bi_(2)Nb_(2)O_(9) ceramics

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Journal of Advanced Dielectrics 2016年第3期6卷 50-55页

作者： Vaibhav Shrivastava Department of Physics Shiv Nadar University Gautam Buddha Nagar 203207Uttar PradeshIndia

In this paper,effects of lttice strain on dielectric properties of Sr_(1-x)Ca_(x)Bi_(2)Nb_(2)O_(9)(x=0.0-0.5 in steps of 0.1)ceramics are *** frequency dipolar polarization is observed to increase for 10%calcium addition and suppresses thereafter on higher calcium *** dielectric loss values for all doped samples were lower compared to undoped one at frequencies beyond 1 *** sample with x=0.1 shows room temperature dielectric constant in the range(130±12)over a wide frequency range from 50Hz to 1 MHz also minimum dielectric loss among all other sample for the same frequeny *** increase in Curie temperature(T_(c))by 50℃ is recorded in the present work by increasing 10%calcium content in SBN *** higher doped samples indicate increase in T_(c) by further higher *** addition,dc conductivity of all samples is measured for all samples and increase in calcium content is observed to generate more insulating compositions compared to undoped SBN with higher intrinsic activation energies.

关键词： lattice strain microstructure dielectric constant dielectric loss dc conductivity

Facile lattice tensile strain compensation in mixed-cation halide perovskite solar cells

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Journal of Energy Chemistry 2022年第3期31卷 422-428,I0012页

作者： Shurong Wang Jie Hu Aili Wang Yuying Cui Bin Chen Xiaobin Niu Feng Hao School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina

Despite the rapid development of power conversion efficiency(PCE)for halide perovskite solar cells(PSCs),the lattice strain engineering in perovskite thin films has been rarely probed in recent ***,a strain compensation by homogeneous crystallization in perovskite films is achieved with the aid of precursor aging in the mixed-cation perovskite of Cs_(0.05)(FA_(0.83)MA_(0.17))Pb(I_(0.90)Br_(0.10))_(3)with near 20%PCE in inverted *** homogeneous crystallization releases the residual tensile stress and induces more compressive stress at the edges of perovskite films,thus elongating the carrier lifetime and reducing the trap-assisted carrier *** high dependence on the perovskite components in strain engineering strategy was systematically revealed,wherein MAPbI_(3)and Cs_(0.05)(FA_(0.83)MA_(0.17))PbI_(3)film showed an increased compressive strain and FAPbI3 film showed adverse tensile strain after *** density functional theory(DFT)calculations are further performed to reveal the change of electronic *** precursor aging-induced strain modulation was correlated with a systematic characterization of the charge carrier transport and recombination dynamics in the mixed-cation perovskite *** believe that this facile approach provides a novel strain engineering strategy for PSCs technology.

关键词： lattice strain Charge transfer Br-ions Ideal factor Hybrid perovskite components