{"id":1711,"date":"2019-05-22T02:47:44","date_gmt":"2019-05-22T02:47:44","guid":{"rendered":"http:\/\/www.meetyoucarbide.com\/single-post-raiders-about-interpret-high-resolution-electron-micrographs-come\/"},"modified":"2020-05-04T13:12:04","modified_gmt":"2020-05-04T13:12:04","slug":"raiders-about-interpret-high-resolution-electron-micrographs-come","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/ru\/raiders-about-interpret-high-resolution-electron-micrographs-come\/","title":{"rendered":"\u0420\u0435\u0439\u0434\u0435\u0440\u044b \u043e\u0431 \u0438\u043d\u0442\u0435\u0440\u043f\u0440\u0435\u0442\u0430\u0446\u0438\u0438 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u043d\u044b\u0445 \u0441\u043d\u0438\u043c\u043a\u043e\u0432 \u0441 \u0432\u044b\u0441\u043e\u043a\u0438\u043c \u0440\u0430\u0437\u0440\u0435\u0448\u0435\u043d\u0438\u0435\u043c \u043f\u0440\u0438\u0445\u043e\u0434\u044f\u0442!"},"content":{"rendered":"
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High-resolution transmission electron microscopy began in the 1950s. In 1956, JWMenter directly observed parallel strips of 12 \u00c5 copper phthalocyanine with a resolution of 8 \u00c5 transmission electron microscope, and opened high-resolution electron microscopy. The door to surgery. In the early 1970s, in 1971, Iijima Chengman used a TEM with a resolution of 3.5 \u00c5 to capture the phase contrast image of Ti2Nb10O29, and directly observed the projection of the atomic group along the incident electron beam. At the same time, the research on high resolution image imaging theory and analysis technology has also made important progress. In the 1970s and 1980s, the electron microscope technology was continuously improved, and the resolution was greatly improved. Generally, the large TEM has been able to guarantee a crystal resolution of 1.44 \u00c5 and a dot resolution of 2 to 3 \u00c5. HRTEM can not only observe the lattice fringe image reflecting the interplanar spacing, but also observe the structural image of the atom or group arrangement in the reaction crystal structure. Recently, Professor David A. Muller’s team at Cornell University in the United States used laminated imaging technology and an independently developed electron microscope pixel array detector to achieve a spatial resolution of 0.39 \u00c5 under low electron beam energy imaging conditions.<\/div>\n
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As shown in Fig. 1, the optical path diagram of the high-resolution electron microscopy imaging process, when an electron beam with a certain wavelength (\u03bb) is incident on a crystal with a crystal plane spacing d, the Bragg condition (2dsin \u03b8 = \u03bb) is satisfied, A diffracted wave is generated at an angle (2\u03b8). This diffracted wave converges on the back focal plane of the objective lens to form a diffraction spot (in an electron microscope, a regular diffraction spot formed on the back focal plane is projected onto the phosphor screen, which is a so-called electron diffraction pattern). When the diffracted wave on the back focal plane continues to move forward, the diffracted wave is synthesized, an enlarged image (electron microscopic image) is formed on the image plane, and two or more large objective lens pupils can be inserted on the back focal plane. Wave interference imaging, called high-resolution electron microscopy, is called a high-resolution electron microscopic image (high-resolution microscopic image).<\/div>\n
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Two-dimensional lattice image: If the electron beam is incident parallel to a certain crystal ribbon axis, a two-dimensional diffraction pattern can be obtained (two-dimensional symmetric distribution with respect to the central transmission spot, shown in Fig. 2(c)). For such an electron diffraction pattern. In the vicinity of the transmission spot, a diffraction wave reflecting the crystal unit cell appears. In the two-dimensional image generated by the interference between the diffracted wave and the transmitted wave, a two-dimensional lattice image showing the unit cell can be observed, and this image contains information on the unit cell scale. However, information that does not contain an atomic scale (into atomic arrangement), that is, a two-dimensional lattice image is a two-dimensional lattice image of single crystal silicon as shown in Fig. 3(d).<\/div>\n
Two-dimensional structure image: A diffraction pattern as shown in Fig. 2(d) is obtained. When a high-resolution electron microscope image is observed with such a diffraction pattern, the more diffraction waves involved in imaging, the information contained in the high-resolution image is also The more. A high-resolution two-dimensional structure image of the Tl2Ba2CuO6 superconducting oxide is shown in Fig. 3(e). However, the diffraction of the high-wavelength side with higher resolution limit of the electron microscope is unlikely to participate in the imaging of the correct structure information, and becomes the background. Therefore, within the range allowed by the resolution. By imaging with as many diffracted waves as possible, it is possible to obtain an image containing the correct information of the arrangement of atoms within the unit cell. The structure image can only be observed in a thin region excited by the proportional relationship between the wave participating in imaging and the thickness of the sample.<\/div>\n

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As shown in Fig. 4, the high resolution image shown varies with the thickness of the sample near the optimum high resolution underfocus. Therefore, when we get a high-resolution image, we can’t simply say what the high-resolution image is. We must first do a computer simulation to calculate the structure of the material under different thicknesses. A high resolution image of the substance. A series of high-resolution images calculated by the computer are compared with the high-resolution images obtained by the experiment to determine the high-resolution images obtained by the experiment. The computer simulation image shown in Fig. 5 is compared with the high resolution image obtained by the experiment.<\/div>\n
This article is organized by the material person column technology consultant.<\/div>\n

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High resolution transmission electron microscopy (HRTEM or HREM) is the phase contrast (the contrast of high-resolution electron microscopy images is formed by the phase difference between the synthesized projected wave and the diffracted wave, It is called phase contrast.) Microscopy, which gives an atomic arrangement of most crystalline materials. High-resolution transmission electron microscopy began in…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/ru\/wp-json\/wp\/v2\/posts\/1711"}],"collection":[{"href":"https:\/\/www.meetyoucarbide.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.meetyoucarbide.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/ru\/wp-json\/wp\/v2\/comments?post=1711"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/ru\/wp-json\/wp\/v2\/posts\/1711\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/ru\/wp-json\/wp\/v2\/media?parent=1711"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/ru\/wp-json\/wp\/v2\/categories?post=1711"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/ru\/wp-json\/wp\/v2\/tags?post=1711"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}