Download PDF by Zhiping Luo: A practical guide to transmission electron microscopy.

By Zhiping Luo

Transmission electron microscope (TEM) is an important instrument for characterizing a number of forms of fabrics. utilizing a gentle microscope, the imaging solution is at a number of hundred nanometers, and for a scanning electron microscope, SEM, at a number of nanometers. The imaging solution of the TEM, notwithstanding, can generally achieve numerous angstroms on a modem tool. furthermore, the TEM may also supply material Read more...

summary: Transmission electron microscope (TEM) is an important software for characterizing numerous different types of fabrics. utilizing a gentle microscope, the imaging solution is at numerous hundred nanometers, and for a scanning electron microscope, SEM, at numerous nanometers. The imaging answer of the TEM, although, can often succeed in a number of angstroms on a modem software. furthermore, the TEM may also supply fabric structural details, because the electrons penetrate during the skinny specimens, and chemical compositional info end result of the powerful electron-specimen atom interactions. these days, TEM is greatly utilized in different components in either actual sciences (chemistry, engineering, geosciences, fabrics technological know-how, and physics) and existence sciences (agriculture, biology, and medicine), enjoying a key position in study or improvement for fabric layout, synthesis, processing, or functionality. This e-book offers a concise useful consultant to the TEM person, ranging from the newbie point, together with upper-division undergraduates, graduates, researchers, and engineers, on the right way to research TEM successfully in a brief time period. it really is written basically for fabrics technology and engineering or comparable disciplines, whereas a few functions in existence sciences also are integrated. It covers lots of the parts utilizing TEM, together with the instrumentation, pattern practise, diffraction, imaging, analytical microscopy, and a few newly constructed complicated microscopy strategies. In every one subject, a theoretical heritage is first of all in brief defined, with step by step directions in experimental operation or computation. a few technical advice are given so one can receive the easiest effects. the sensible techniques to obtain, learn, and interpret the TEM facts are for that reason supplied. This publication could function a textbook for a TEM direction or workshop, or a reference e-book for the TEM person to enhance their TEM abilities

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Extra info for A practical guide to transmission electron microscopy. Volume II, : Advanced microscopy

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More details about the HOLZ diffraction is illustrated in Fig. 9. For a primitive cubic (PC) structure, its reciprocal is still PC, as shown in Fig. 9(a), and thus its HOLZ diffraction spots have the same geometry as ZOLZ. The zero-order and all high-order diffraction spots coincide in the pattern. However for a face-centered cubic (FCC) structure, its reciprocal space is body-centered cubic (BCC), as shown in Fig. 9(d). The zero- and second-order diffraction patterns have the same geometry, while first- and third-order pattern spots are translated to the square centers of the ZOLZ pattern.

4. Switch to CBED or Nano Probe beam (the beam may become darker now), move the interested area to the center of screen, focus the beam to a point (crossover) on the sample using Brightness knob, and then press Diffraction button to switch to the diffraction mode. A CBED pattern is obtained. 5. Select different camera length L to see details in the (000) disk (bright-field symmetry) using a longer L, or whole-pattern symmetry using a shorter L. Fig. 11(a) shows an SAED pattern of Mg–Zn–Y quasi-crystal (QC) [7] along a fivefold axis, displaying a 10-fold symmetry.

Focus the beam to a crossover point on the sample using Brightness knob and ensure the interested area is still in the center and the beam is focused on it (at a crossover), then press Diffraction button to switch to the diffraction mode. An NBED pattern is therefore obtained. Although the operations of NBED and CBED are similar by focusing the beam to get a crossover on the sample without using the diffraction aperture, it is more difficult to work with NBED, just because the beam becomes very dark, and the image is visible only when the beam almost forms a crossover.

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