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搜索结果: 1-15 共查到HRTEM相关记录16条 . 查询时间(0.136 秒)
采用金属有机物化学气相沉积法(MOCVD)生长GaAs/Al0.3Ga0.7As 量子阱材料,制备300 μm×300 μm 台面,内电极压焊点面积为20 μm×20 μm,外电极压焊点面积为80 μm×80 μm 的单元样品两种。用变温液氮制冷系统对样品进行77 ~300 K 暗电流特性测试。结果显示,器件暗电流曲线呈现出正负偏压的不对称性。利用高分辨透射扫描电镜(HRTEM)获得样品纳米尺度横...
为了获取褐煤的基本结构单元(BSU)组成信息,采用不同溶剂对龙口褐煤进行分级萃取,借助于X射线衍射仪(XRD)和高分辨透射电镜(HRTEM),对比研究了褐煤大分子骨架结构的排列方式及其萃取前后微晶结构参数的变化特征。研究表明:随着萃取程度的增加,芳香层间距减小,而芳香层片的长度和宽度略有加大,但不同微晶结构,其参数值变化的机理不同;原煤的TEM图像比较清晰,芳香层结构及其排列方式较为均一,随着萃取...
摘要: 采用硫化态前驱物四硫代钼酸铵溶液浸渍载体 -Al2O3制备了硫化态NiMoS/ -Al2O3加氢精制催化剂,对催化剂进行了XRD和HRTEM表征,并以FCC柴油为原料,考察了催化剂的加氢精制性能。结果表明,该加氢催化剂的活性组分与载体 -Al2O3的相互作用较弱,不存在难以还原硫化的Mo-O-Al桥键,催化剂表面MoS2分散度较好,MoS2的晶粒较大,堆积层数较高,大部分MoS2以II型的...
期刊信息 篇名 Transformation from ferrihydrite into geoethite in soil from Colorado Plateau: HRTEM invastigation. 语种 英文 撰写或编译 撰写 作者 Xu HF,Chen TH,Carlos F,Jove Colon,Randall Cygan 第一作者单位 刊物名称 ICEM-15 Durban...
期刊信息 篇名 HRTEM study of crystallization of Zi-Ni-Cu metallic glass 语种 英文 撰写或编译 作者 Huan-Rong Wang,Yu-Fu Deng,Yu-Lai Gao,Xi-Dong Hui,Guang-Hui Min 第一作者单位 刊物名称 Journal of Alloy and Compounds 页面 350, 174-1...
Abstract: It is shown that polytypes or stacking sequences of cronstedtite, an Fe-bearing trioctahedral 1:1 phyllosilicate, can be determined using near-atomic high-resolution transmission electron mi...
To elucidate the process and mechanism of the prograde conversion of saponite to chlorite through corrensite, the microstructures of a series of chlorite-smectite (C-S) mixed-layer samples from Kamik...
Selected-areaelectrondiffraction(SAED)combinedwithexperimentalandcomputed high-resolutiontransmissionelectronmicroscopy(HRTEM)imageswereusedtoinvesti- gatepolytypism,stackingdisorder,mixedlayering,a...
Abstract: The transformation of smectite into kaolinite and kaolinite-smectite interstratification were studied in samples belonging to the Argiles Plastiques formation of the Paris basin, by high-res...
Abstract: The question of whether clay minerals can be biogenically transformed as a result of lichen activity at the lichen-rock interface remains unresolved. We applied several microscopical and ana...
High-resolution transmission electron microscopy reveals dense Brazil-twin boundaries on the unit-cell scale in length-slow chalcedony. The twins can be considered as the result of stacking of left- a...
Microcrystalline opal wasinvestigated using low-dose transmission electron microscopy (TEM) methods to identify microstructural characteristics and possible phase-transforma-tion mechanisms that accom...
Fundamental particle thickness measurements of Dolná Ves hydrothermal illite/smectite (I/S) samples confirmed earlier findings regarding the content of fixed cations in illite interlayers (ca. 0.9/O10...
Synchrotron radiation, high-resolution transmission electron microscopy (HRTEM),X-ray powder diffraction, and Raman spectroscopy wereused to study the structure and thermal behavior of malayaite, CaSn...
To explore the effect of pressure on the stacking-sequence of the chlorite cookeite, a systematic TEM study ofstacking microstructures has been conducted onnatural samples from pegmatitic and metamorp...

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