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1.
InvestigationofEL2Defectin10MeVElectronIrradiatedUndopedSemi-insulatingLECGaAsWuFengmei,ShiYi,ChenWuming,WuHongweiandLaiQiji(... 相似文献
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The local vibration mode(LVM)of carbon acceptor in GaAs is studied by measuring directly the changein LVM absorption with a NIC-170 SX FT-IR spectrometer.The change in the charge state of carbon acceptorand the temperature dependence of the LVM absorption were investigated also.The contents of the impuritiesother than carbon were estimated by secondary ion mass spectrometry.It is observed that the frequency,thespectral form and the integrated absorption of the LVM are not affected by the change in charge state of car-bon acceptor. 相似文献
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SpatialDistributionofEL2DefectinSemi-insulatingGaAsRuQiongna;LiGuangpingandHeXiukun(汝琼娜)(李光平)(何秀坤)(TianjngElectronicMaterials... 相似文献
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《Acta Materialia》1999,47(17):4263-4274
Electron backscatter diffraction was used in conjunction with deep etching to examine the relationship between the crystallography and three-dimensional morphology of cementite precipitates in an Fe–1.34 wt% C–13.1 wt% Mn steel. Orientation relationships (ORs) between more than 200 proeutectoid Widmanstätten cementite precipitates and the surrounding austenite were determined to be on or very near either the well-known Pitsch OR or the Farooque–Edmonds OR. Scanning electron microscopy of the same specimens after deep etching was used to determine the three-dimensional morphology of each of the precipitates for which an OR was determined. These precipitates could be identified as either monolithic plates or conglomerates of laths. Results show that monolithic plates consistently exhibit the Pitsch OR and conglomerates of laths have the Farooque–Edmonds OR, indicating that the precipitate morphologies are dictated by their orientation relationships. 相似文献
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《稀有金属(英文版)》1989,(2)
The relation between electronic structures and formability of icosahedral quasicrystals in Al-transition metal binary alloys isinvestigated systematically.It is found that the number of (s d) electrons in the transition metals and the parameter |Δ1| which isa measure of the relative bonding between Al and the transition metals are closely related to the formability of icosahedralquasicrystals.Two rules of thumb are derived from the experimental results for twelve Al-transition metal alloys. 相似文献
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1 INTRODUCTIONCu baseshapememoryalloys (SMA)arecom merciallyattractivesystemsforthepracticalexploita tionoftheshapememoryeffect (SME 相似文献
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1-IntroductionCarbonisaprevailingresidualimpurityinundopedsemiinsulating(SI)GaAscrystalsgrownbytheliquidencapsulatedCzochralski(LEC)technique,anditpredominantlyoccupiesthearsenicsiteasacceptorCAs.Sincethemassofcarbonatomismuchlighterthanthatofars… 相似文献
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RamanStudyofDefectsinSI-GaAsandSe-dopedEpitaxialLayerIrradiatedby10MeVElectronsWuFengmei,LiHaifeng,ChenWuming,ChengGungxuandH... 相似文献
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The correlation between the oxide impedance and corrosion behavior of two series of Zr−Nb−Sn−Fe−Cu alloys was evaluated. Corrosion
tests were performed in a 70 ppm LiOH aqueous solution at 360°C for 300 days. The results of the corrosion tests revealed
that the corrosion behavior of the alloys depended on the Nb and Sn content. The impedance characteristics for the pre- and
post-transition oxide layers formed on the surface of the alloys were investigated in sulfuric acid at room temperature. From
the results, a pertinent equivalent circuit model was preferably established, explaining the properties of double oxide layers.
The impedance of the oxide layers correlated with the corrosion behavior; better corrosion resistance always showed higher
electric resistance for the inner layers. It is thus concluded that a pertinent equivalent circuit model would be useful for
evaluating the long-term corrosion behavior of Zr−Nb−Sn−Fe−Cu alloys. 相似文献
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SHIGEYOSHIHAGA HARUSHIGETSUBAKINO YASUNORIHARADA 《材料热处理学报》2004,25(5):398-400
Nowadays, in the auto industry, the need for improvement of fuel efficiency is getting increased more and more in terms of the global warming, as well as the need of light-weighting of gears, transmission parts. Hence, we‘ve studied the relation between the shot peening working conditions and factors for improvement of gear‘s fatigue life, and also the relation between the factors for improvement and the fatigue life, applying shot peening to a gear of SNCM220. Also, we examined the relation between the fatigue life and arc height that is utilized as a substitute characteristic for shot peening working conditions, adding its observation here. 相似文献
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RelationbetweenEL2GroupandEL6GroupinSI-GaAsWuFengmei吴凤美(Deportmentofphysics,NanjingUniversity,Nanjing210093,China)ZhaoZhouyin... 相似文献
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Ruixia Yang Fuqiang Zhang Nuofu Chen ) Hebei University of Technology Tianjin China ) Institute of Semiconductors Chinese Academy of Sciences Beijing China 《稀有金属(英文版)》2001,20(3)
NDSILECGaAs crystals are widely used assubstrates for the fabrication of high perform-ance GaAs illtegrated circuit by an ion imPlama-tion technique. In the fabricaton Process, post-implamation annaling must be used to actiVatethe imPlanation atoms. Considerable changescan, howevef, occur in the elechical prOPeftiesof SI substfates after annealing. For examPle,the SI substfate is converted to p-tyPe conduc-ting [l] or a thin p-tyPe conducting layer is for-med on the surface of the SI… 相似文献
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利用电荷离散变分Xα(SCC-DV-Xα)方法计算了ZrMn2和TiMn2及其氢化物的电子结构,分析了电子结构对吸氢性能的影响.结果表明:在ZrMn2氢化物中,H原子与Mn原子的成键作用强于H原子与Zr原子之间的相互作用;在TiMn2H中,H原子也是主要与Mn的3p轨道成键,但与Ti的3p轨道也有一定的相互作用;H与Ti的3p轨道的弱键作用减弱了H与Mn的3p轨道的相互作用;吸氢使ZrMn2的c轴比a轴更容易产生变化. 相似文献
16.
Sook Wai Phang Masato Tadokoro Jiro Watanabe Noriyuki Kuramoto 《Synthetic Metals》2008,158(6):251-258
As nanomaterial possessing moderate conductivity, magnetic and dielectric property, novel hexanoic acid (HA)-doped polyaniline (PAni) nanocomposites containing TiO2 nanoparticles (dielectric filler) and carbon nanotubes, CNTs (magnetic fillers such as single-walled carbon nanotube, SWNT and multi-walled carbon nanotube, MWNT) were prepared by template free method. The PAni were characterized by UV, FTIR, X-ray diffraction (XRD), thermogravimetric (TGA) and scanning electron microscopy (SEM) analyses. Conductivity, magnetization, dielectric and microwave absorption properties of PAni were also investigated. The resulted nanorods/tubes as shown in SEM images clearly show that polymerization is proceeded in micelle/water interface through elongation. During template free method, TiO2 and CNT exist in the center of Ani/HA micelle. The SEM images show that some of the CNT enwrapped with PAni layer indicate CNT are just packed underneath the PAni and never attacked by PAni. PAni/HA/TiO2/SWNT with 20% of SWNT exhibits the best microwave absorption property (99.2% absorption) with reflection loss of −21.7 dB at 6 GHz due to its moderate conductivity (1.27 S/cm), magnetization (Ms = 1.01 emu/g), highest tan δ and heterogeneity. 相似文献