Cs-corrected HAADF-STEM imaging of silicate minerals.
Cs-corrected HAADF-STEM imaging of silicate minerals.
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硅酸盐矿物的 Cs 校正 HAADF-STEM 成像。
DOI：
10.1093/jmicro/dfq003
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
E. Okunishi
中科院分区：
文献类型：
--
作者：
T. Kogure;E. Okunishi
球差校正器（Cs-corrector）的发展显著提高了电子显微镜的分辨率，为了解硅酸盐矿物中的局部原子结构提供了有价值的信息。阳离子色谱柱由ca分隔。1.5源自氧阴离子的离子半径或最近的氧-氧距离的一半的A在硅酸盐中是常见的，并且它们容易通过Cs校正的透射电子显微镜（TEM）或扫描TEM（STEM）以接近1 A的分辨率分辨。高角度环形暗场（HAADF）成像使用铯校正的STEM应用于斜方辉石（Opx）与普通辉石lamantine，和cronstedtite，含铁的片状硅酸盐。HAADF图像中的噪声对比度通过先进的噪声滤波技术进行补偿。辉石结构中的所有阳离子柱在HAADF图像中从c轴分辨。一个亚埃的差异，在M2网站的位置之间的Opx和辉石，这是由Fe（Opx）和Ca（辉石）的网站的占领所造成的，清楚地检测到在HAADF图像以及不同的对比度的阳离子柱相关的占领元素。一对四面体的阳离子柱被约。1.5在[100]方向上观察到的钙钛矿中的A经常显示不相等的对比度，这表明两个柱之间的Fe（3+）取代量不同。实验对比与简单模拟的比较表明，Fe（3+）分布在四面体片中，避免了Fe（3+）配位四面体的连接。
Significant improvement of the resolution for electron microscopy by the development of the spherical aberration corrector (Cs-corrector) brings valuable information to understand local atomic structures in silicate minerals. Cation columns separated by ca. 1.5 A, which originate from the ionic radius of oxygen anion or half of the closest oxygen-oxygen distance, are common in silicates and they are easily resolved by a Cs-corrected transmission electron microscope (TEM) or scanning TEM (STEM) with a resolution close to 1 A. High-angle annular dark-field (HAADF) imaging using Cs-corrected STEM was applied to orthopyroxene (Opx) with augite lamellae, and cronstedtite, an iron-bearing sheet silicate. Noisy contrast in the HAADF images was compensated by advanced noise filtering techniques. All cation columns in the pyroxene structure were resolved in the HAADF images from the c-axis. A sub-angstrom difference in the position of the M2 site between Opx and augite, which is caused by the occupation of the site by Fe (Opx) and Ca (augite), was clearly detected in the HAADF image as well as different contrasts of the cation columns related to occupying elements. A pair of tetrahedral cation columns separated by ca. 1.5 A in cronstedtite observed along [100] directions frequently show unequal contrast, suggesting a difference of the amounts of substituted Fe(3+) between the two columns. Comparison between the experimental contrast with a simple simulation suggests the distribution of Fe(3+) in a tetrahedral sheet avoiding linkage of Fe(3+) coordinating tetrahedrons.
日本日高高温辉长糜棱岩的晶粒减小机制和流变学后果
DOI：
--
发表时间：
2007
期刊：
Earth and Planetary Science Letters 267
影响因子：
--
作者：
Raimbourg;Hugues
通讯作者：
Hugues