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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...
龙口褐煤萃取后微晶结构的XRD与HRTEM研究
龙口褐煤 分级萃取 微晶结构参数 大分子结构排列
2013/12/5
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...
A HRTEM Study of Cronstedtite: Determination of Polytypes and Layer Polarity in Trioctahedral 1:1 Phyllosilicates
Cronstedtite HRTEM Layer Polarity Morphology Polytype Stacking Disorder Trioctahedral 1:1 Phyllosilicates
2011/12/5
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...
HRTEM evidence for the process and mechanism of saponite-to-chlorite conversion through corrensite
chlorite-smectite saponite-to-chlorite conversion corrensite
2012/3/31
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...
HRTEM and SAED investigations of polytypism, stacking disorder, crystal growth, and vacancies in chlorites from subgreenschist facies outcrops
Selected-area electron diffraction high-resolutio transmission electron microscopy
2012/3/30
Selected-areaelectrondiffraction(SAED)combinedwithexperimentalandcomputed
high-resolutiontransmissionelectronmicroscopy(HRTEM)imageswereusedtoinvesti-
gatepolytypism,stackingdisorder,mixedlayering,a...
Transformation Mechanisms and Interstratification in Conversion of Smectite to Kaolinite: An HRTEM Study
HRTEM Interstratification Kaolinite Smectite Transformation Mechanisms
2011/12/8
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...
Mineralogical Transformation of Bioweathered Granitic Biotite, Studied by HRTEM: Evidence for a New Pathway in Lichen Activity
Back-scattered Electrons Biotite Bioweathering Granite High-Resolution Transmission Electron Microscopy (HRTEM) Lattice-Fringe Images Lichens Vermiculite
2011/12/8
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...
HRTEM investigation of microstructures in a length-slow chalcedony
HRTEM investigation microstructures length-slow chalcedony
2012/3/31
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...
HRTEM of microcrystalline opal in chert and porcelanite from the Monterey Formation, California
HRTEM microcrystalline opal chert porcelanite Monterey Formation California
2012/4/9
Microcrystalline opal wasinvestigated using low-dose transmission electron microscopy (TEM) methods to identify microstructural characteristics and possible phase-transforma-tion mechanisms that accom...
Particle Shape versus Coherent Scattering Domain of Illite/Smectite: Evidence from HRTEM of Dolna Ves Clays
Coherent scattering domain Fundamental particle HRTEM Illite/Smectite Mixed-layer crystal
2011/12/27
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...
A synchrotron radiation, HRTEM, X-ray powder diffraction, and Raman spectroscopic study of malayaite, CaSnSiO5
synchrotron radiation HRTEM X-ray powder diffraction Raman spectroscopic study malayaite CaSnSiO5
2012/4/5
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...
Ordering of the stacking sequence in cookeite with increasing pressure: An HRTEM study
Ordering stacking sequence cookeite increasing pressure HRTEM study
2012/4/5
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...
A (1:1) 7-A Fe Phase and its Transformation in Recent Sediments: An HRTEM and AEM Study
7-A Fe phase 10-A phyllosilicates AEM HRTEM Marine sediments Phase transformation
2011/12/28
Young marine green grains, from Fe-rich sediments, were studied by using HRTEM systematically combined with punctual microchemical EDX analyses. Experimental results demonstrated these grains were mad...