Electron Backscatter Diffraction (EBSD) has proven to be a useful tool for characterizing the crystallographic orientation aspects of microstructures at length scales ranging from tens of nanometers to millimeters in the scanning electron microscope (SEM). With the advent of high-speed digital cameras for EBSD use, it has become practical to use the EBSD detector as an imaging device similar to a backscatter (or forward-scatter) detector. Using the EBSD detector in this manner enables images exhibiting topographic, atomic density and orientation contrast to be obtained at rates similar to slow scanning in the conventional SEM manner. The high-speed acquisition is achieved through extreme binning of the camera-enough to result in a 5 × 5 pixel pattern. At such high binning, the captured patterns are not suitable for indexing. However, no indexing is required for using the detector as an imaging device. Rather, a 5 × 5 array of images is formed by essentially using each pixel in the 5 × 5 pixel pattern as an individual scattered electron detector. The images can also be formed at traditional EBSD scanning rates by recording the image data during a scan or can also be formed through post-processing of patterns recorded at each point in the scan. Such images lend themselves to correlative analysis of image data with the usual orientation data provided by and with chemical data obtained simultaneously via X-Ray Energy Dispersive Spectroscopy (XEDS).
The catalytic performance of microporous materials such as zeolites is determined not only by the active sites' molecular architecture, but also by the organization of the surrounding pores with varying diameter, shape, and directionality. These pores control transport of reagents and products and induce shape selectivity. Rather than being ideal single crystals, zeolites often have complex 3-dimensional morphologies, comprising intergrowths and various defect types. Here, the underlying pore architecture of the hexagonal facet of an individual zeolite ZSM-5 crystal is successfully determined by electron beam scattering diffraction and is correlated with the initial reactivity toward the acid-catalyzed oligomerization of furfuryl alcohol using polarized fluorescence microscopy.
Glasses with the mol% composition 17Y 2 O 3 ?33Al 2 O 3 ?40SiO 2 ?2AlF 3 ?3Na 2 O?2CeF 3 ?3B 2 O 3 were thermally annealed at 1000 uC for different periods of time. This resulted in the surface nucleation and subsequent growth of Ce 3+ -doped yttrium aluminium garnet (YAG) which shows an intense broadband fluorescence.In the bulk, the nucleation and subsequent growth of an X-ray amorphous star-shaped and alumina enriched phase leads to a depletion of alumina from the glass. The nucleation of monoclinic and orthorhombic Y 2 Si 2 O 7 adjacent to the YAG layer is observed in addition to pore formation. These pores serve as centres for enhanced nucleation near the surface. The nucleation and growth of the orthorhombic phase and a different monoclinic Y 2 Si 2 O 7 are additionally observed in the bulk. The phase identification and localization was performed by X-ray diffraction and electron backscatter diffraction (EBSD).
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