共查询到18条相似文献,搜索用时 93 毫秒
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钙稀土氟碳酸盐矿物中的晶畴结构特征*孟大维1,2吴秀玲1,2李斗星2孟祥敏2(1.中国地质大学,武汉4300742.中国科学院金属研究所固体原子像开放研究实验室,沈阳110015)用电子衍射和高分辨电子显微像方法研究了钙稀土氟碳酸盐矿物中的晶畴结构特... 相似文献
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氟碳铈矿/直氟碳钙铈矿混层结构中新规则混层矿物的超微结构研究 总被引:4,自引:0,他引:4
用电子衍射和晶格像技术研究了钙稀土氟碳酸盐矿物中的氟碳铈矿(B)/直氟碳钙铈矿(S)混层结构,发现并确定了B_4S_4、B_8S_6、B_1S_6、B_7S_4和B_2S_15种新规则混层矿物的对称性、晶胞参数及理论晶体化学式。根据所获得的高分辨晶格像真实而直观地揭示出该类B_mS_n(m>n)型新规则混层矿物的长周期有序堆垛结构特征及变化规律。 相似文献
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利用高分辨电子显微技术(HREM)研究了钙稀土氟碳酸盐矿物晶体结构中的混层现象,在BmSn型规则混层矿物中发现了B5S4-3R和6R两种新多型,确定了它们的晶体结构类型,晶胞参数等,揭示出B5S4规则混层矿物不同多型体的超微结构特征,讨论了B5S4-6R多型晶体结构沿C方向的无序夹层和堆垛层错等晶体缺陷现象。 相似文献
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2082砂岩型铀矿床中铀矿物的电子探针研究 总被引:2,自引:0,他引:2
2082矿床是新发现的可地浸砂岩型铀矿床。该类矿床矿石中铀矿物颗粒细小,多在微米级别,光学显微镜下很难鉴别,电子探针等微束分析手段是研究砂岩型铀矿床物质组分的最有效手段。 相似文献
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新矿物彭志忠石及其有关矿物的电子探针研究 总被引:2,自引:0,他引:2
彭志忠石是一种含锡、铝、镁、铁、锌、钛等多种元素的氧化物类的新矿物,产于我国湖南省安化等地区。已发现有6H、24R两种多型。彭志忠石,6H:(Mg,Fe,Zn,A1)_4(Sn,Fe)_2(Al,□)_(10)O_(22)(OH)_2,24R:(Mg,Zn,Fe,Al)_6(Sn,Ti)_2(Al,□)_(14)O_(30)(OH)_2。彭志忠石不同于尼日利亚石,也不同于黑铝镁铁矿。矿物浅黄褐色、浅黄色、少量无色,呈六方板状晶体,空间群P3ml。电子探针定量分析成分为:SnO_218.73、MgO8.03、Al_2O_356.00、Fe_2O_38.38、SiO_21.48、ZnO4.73、MnO0.4,另外有少量H_2O~+1.88(化分),总计99.63%。 相似文献
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TiO2是一种具有广泛应用前景的氧化物材料,其结构及相关的物理化学特性一直是实验和理论研究的焦点.常温常压下TiO2可以以四种形态存在,即锐钛矿、金红石、板钛矿和α-PbO2型.其中属四方晶系的金红石是最稳定的,其它几种形态在高温下都将转变成金红石.板钛矿和α-PbO2型TiO2都属正交晶系,但前者只是以亚稳相的形式存在,而后者则是一种高压淬火相.α-PbO2型TiO2可以在0.8到10.0GPa的压强下形成,其晶格参数为a=4.55、b=5.46、c=4.92[1]. 相似文献
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PDP显示器具有屏幕大、视角宽、清晰度高、重量轻及机体薄等出众优点,目前被广泛应用于显示、显像、光源、X射线增感屏及医学放射学图像摄影技术等领域。PDP的显示性能除了与其显示屏结构、驱动技术有关外,其中一个重要影响因素是作为显示发光主体的荧光粉材料。 相似文献
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电子背散射衍射装置是获取材料的亚微米的范畴晶体学信息扫描电镜附件 ,此装置可在观察材料的形貌及分析成分的同时研究材料的取向关系。本文介绍了两种不同档次的电子背散射衍射接收系统 ,该系统的CCD以快速方式接收的灵敏度为 5mlux,积累方式接收的灵敏度为 1 0 μlux ,分辨率为 51 2dpi,像元数分别为 51 2× 51 2× 8bit、51 2× 51 2× 1 6bit,扫描卡最高的分辨率为 4 0 96× 4 0 96,并成功地安装在北京有色金属研究总院JSM 84 0扫描电镜上。此系统设计合理、结构简单、操作方便安全。同时编写了识别和标定电子背散射衍射花样的软件 相似文献
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本文利用TEM原位加热手段和选区电子衍射分析方法,对纳米晶Pd-Si薄膜在加热过程中析出的相进行了研究。真空蒸发Pd_(80)Si_(20)合金而得到的纳米晶Pd-Si薄膜,其晶粒尺寸为10nm,结构属fcc。随着温度的升高,薄膜中晶粒长大,在局部区域有其它相析出。利用选区电子衍射图确定了这些析出相的结构。 相似文献
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Kunio Yubuta Yuzuru Miyazaki Ichiro Terasaki Tsuyoshi Kajitani 《Journal of Electronic Materials》2009,38(7):1116-1120
Excess oxygen exists in four-layered rock-salt (RS)-type units of modulated misfit-layered Bi-Sr-(Co,Rh)-O compounds, which
consist of interpenetrating CdI2-type (Co,Rh)O2 and distorted four-layered RS-type block subsystems, which have two b-axes, i.e., b
1 and b
2, respectively. From carefully determined chemical contents and misfit ratios, p = b
1/b
2, two structural characteristics are concluded, namely, intermixing metal ions in the RS-type layers and excess oxygen δ in, or in the vicinity of, them. The chemical formulae are proposed as [(Bi1−x
(Co,Rh)
x
)2(Sr1−y
Bi
y
)2O4+δ
]
p
(Co,Rh)O2. The valence states of␣cobalt and rhodium ions are close to 3.3+. These valence states are quite reasonable for good thermoelectric
oxides, such as γ-Na0.7CoO2 and [Ca2CoO3]0.62CoO2. Excess oxygen would cause the undulated atomic arrangement. 相似文献
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Nickel hydroxide films were deposited using a facile ammonia-induced method. The deposited films were composed of stacking structures without using templates or surfactants. The microstructures of the deposited films and subsequently calcined NiO films were characterized using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The electrical properties were also investigated. The deposited films consisted of triangular stacks of single crystal hexagonal Ni(OH)2 and their microstructures were highly affected by the substrate type. A preference for orientation along the (001) plane was observed in the Ni(OH)2 films deposited onto indium tin oxide (ITO) substrates with a high texture coefficient of 4.5. These characteristics were not found in Ni(OH)2 films deposited onto glass and silicon substrates. Calcined films did not show a strong preference in orientation and were found to be n-type NiO. 相似文献
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S.M. Bishop C.L. Reynolds Jr. Z. Liliental-Weber Y. Uprety J. Zhu D. Wang M. Park J.C. Molstad D.E. Barnhardt A. Shrivastava T.S. Sudarshan R.F. Davis 《Journal of Electronic Materials》2007,36(4):285-296
The polytype and surface and defect microstructure of epitaxial layers grown on 4H(), 4H(0001) on-axis, 4H(0001) 8° off-axis, and 6H(0001) on-axis substrates have been investigated. High-resolution x-ray diffraction
(XRD) revealed the epitaxial layers on 4H() and 4H(0001) 8° off-axis to have the 4H-SiC (silicon carbide) polytype, while the 3C-SiC polytype was identified for epitaxial
layers on 4H(0001) and 6H(0001) on-axis substrates. Cathodoluminescence (CL), Raman spectroscopy, and transmission electron
microscopy (TEM) confirmed these results. The epitaxial surface of 4H() films was specular with a roughness of 0.16-nm root-mean-square (RMS), in contrast to the surfaces of the other epitaxial
layer-substrate orientations, which contained curvilinear boundaries, growth pits (∼3 × 104 cm−2), triangular defects >100 μm, and significant step bunching. Molten KOH etching revealed large defect densities within 4H() films that decreased with film thickness to ∼106 cm−2 at 2.5 μm, while cross-sectional TEM studies showed areas free of defects and an indistinguishable film-substrate interface for 4H() epitaxial layers. 相似文献