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diffraction
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Series: ASM Technical Books
Publisher: ASM International
Published: 23 January 2020
DOI: 10.31399/asm.tb.stemsem.t56000001
EISBN: 978-1-62708-292-1
... Abstract This chapter discusses the principles of scanning transmission electron microscopy (STEM) as implemented using conventional scanning electron microscopes (SEMs). It describes the pros and cons of low-energy imaging and diffraction, addresses basic hardware requirements, and provides...
Abstract
This chapter discusses the principles of scanning transmission electron microscopy (STEM) as implemented using conventional scanning electron microscopes (SEMs). It describes the pros and cons of low-energy imaging and diffraction, addresses basic hardware requirements, and provides information on imaging modes, detector positioning and alignment, and the effect of contrast reversal. It also discusses beam convergence and angular selectivity, the use of application-specific masks, and how to generate grain orientation maps for different material systems.
Series: ASM Technical Books
Publisher: ASM International
Published: 23 January 2020
DOI: 10.31399/asm.tb.stemsem.t56000020
EISBN: 978-1-62708-292-1
... it is directed by the user to either a CMOS sensor (to record diffraction patterns) or a photomultiplier tube (to observe real-space images). The chapter discusses some of the nuances of digital imaging and diffraction and includes examples in which transmission electron detectors are used to analyze gold films...
Abstract
This chapter discusses the setup and use of a transmission electron detector in a typical scanning electron microscope (SEM). It describes the arrangement and function of the primary components in the detector, following the signal path from the sample to a micromirror array where it is directed by the user to either a CMOS sensor (to record diffraction patterns) or a photomultiplier tube (to observe real-space images). The chapter discusses some of the nuances of digital imaging and diffraction and includes examples in which transmission electron detectors are used to analyze gold films, carbon nanotubes, zeolite sheets, and monolayer graphene. It also describes emerging techniques, including four-dimensional STEM, thermal diffuse scattering, energy filtering, aberration correction, and atomic resolution imaging.
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Published: 01 December 2018
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Published: 01 December 2018
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Published: 01 November 2019
Figure 9 Illumination from a point source spreads at the focus due to diffraction. The spread is least for large N.A. This ultimately limits resolution. On film a well exposed Airy Disk would appear as in the upper right.
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Published: 01 July 1997
Fig. 18 X-ray diffraction trace of fusion zone in Ti-6Al-4V sheet welded using a tantalum shim, showing peaks that identify hexagonal structures
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Published: 01 December 2008
Fig. 8.22 (a, upper) The Laue diffraction image of Al-4%Cu alloy photographed by Preston ( Ref 20 , 22 ). (a, lower) the image of Guinier-Preston zone in the Al-Cu alloy from high-resolution electron microscopy ( Ref 23 ). (b, upper) The phase diagram and the free-energy diagram
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in Global Projects on Advanced High-Strength Steels
> Advanced-High Strength Steels: Science, Technology, and Applications
Published: 01 August 2013
Fig. 13.8 Electron backscatter diffraction mapping of (a) annealed and (b) deformed Fe-30Mn. Source: Ref 13.4
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in Global Projects on Advanced High-Strength Steels
> Advanced-High Strength Steels: Science, Technology, and Applications
Published: 01 August 2013
Fig. 13.11 Electron backscatter diffraction mapping of (a) annealed and (b) deformed Fe-24Mn. Source: Ref 13.4
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in Detection and Sizing of Stress-Corrosion Cracks in Boiling Water Reactor Environments[1]
> Stress-Corrosion Cracking: Materials Performance and Evaluation
Published: 01 January 2017
Fig. 16.2 Comparison of sizing results obtained with crack-tip-diffraction and amplitude-drop sizing techniques. Source: Ref 16.10
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in The Expanded Metallographic Laboratory
> Metallographer’s Guide: Practices and Procedures for Irons and Steels
Published: 01 March 2002
Fig. 6.12 An electron diffraction pattern of body-centered cubic iron taken from a region in a thin foil representing a single grain. Large white spot is the primary beam, and the surrounding spots are the diffracted beams, each representing a different crystallographic plane in the iron
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in The Expanded Metallographic Laboratory
> Metallographer’s Guide: Practices and Procedures for Irons and Steels
Published: 01 March 2002
Fig. 6.30 X-ray diffraction data showing the oxides present in scale on a steel surface. Each peak represents a particular 2θ value and corresponding d -spacing for a constituent. Each peak is labeled with the constituent matching that particular 2θ angle. The vertical axis (intensity
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in Tools and Techniques for Material Characterization of Boiler Tubes
> Failure Investigation of Boiler Tubes: A Comprehensive Approach
Published: 01 December 2018
Fig. 5.20 X-ray diffraction pattern of a scale on hot-rolled steel. Source: Ref 5.17
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in Tools and Techniques for Material Characterization of Boiler Tubes
> Failure Investigation of Boiler Tubes: A Comprehensive Approach
Published: 01 December 2018
Fig. 5.21 X-ray diffraction profile for corrosion products formed on steel surface. Source: Ref 5.18
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in Tools and Techniques for Material Characterization of Boiler Tubes
> Failure Investigation of Boiler Tubes: A Comprehensive Approach
Published: 01 December 2018
Fig. 5.22 X-ray diffraction pattern of anatase and brookite. Source: Ref 5.19
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in Tools and Techniques for Material Characterization of Boiler Tubes
> Failure Investigation of Boiler Tubes: A Comprehensive Approach
Published: 01 December 2018
Fig. 5.25 Schematic showing basic principle of x-ray diffraction.
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Published: 01 June 2016
Fig. 5.5 X-ray diffraction patterns from (a) cold-sprayed titanium coating after removal of progressive layers from the coating compared with α titanium, indicating no phase transformation taking place in the coating, and (b) cold-sprayed WC-Co without any decarburization after the cold spray
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Published: 01 June 2016
Fig. 5.6 X-ray diffraction patterns comparing (a) warm-sprayed and (b) cold-sprayed titanium coating, along with the respective starting powders, indicate the presence of TiO oxides along with the metal in the warm-sprayed coating. Williamson-Hall plots for the (c) warm-sprayed and (d) cold
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