High Resolution Powder Electron Diffraction in Scanning Electron Microscopy
Autor: | Radim Skoupy, Vladislav Krzyzanek, Ewa Pavlova, Miroslav Slouf |
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Rok vydání: | 2021 |
Předmět: |
Technology
Microscopy QC120-168.85 powder nanobeam electron diffraction QH201-278.5 Engineering (General). Civil engineering (General) nanoparticle analysis 4D-STEM Article TK1-9971 Descriptive and experimental mechanics General Materials Science Electrical engineering. Electronics. Nuclear engineering TA1-2040 |
Zdroj: | Materials Materials, Vol 14, Iss 7550, p 7550 (2021) Materials; Volume 14; Issue 24; Pages: 7550 |
ISSN: | 1996-1944 |
Popis: | A modern scanning electron microscope equipped with a pixelated detector of transmitted electrons can record a four-dimensional (4D) dataset containing a two-dimensional (2D) array of 2D nanobeam electron diffraction patterns; this is known as a four-dimensional scanning transmission electron microscopy (4D-STEM). In this work, we introduce a new version of our method called 4D-STEM/PNBD (powder nanobeam diffraction), which yields high-resolution powder diffractograms, whose quality is fully comparable to standard TEM/SAED (selected-area electron diffraction) patterns. Our method converts a complex 4D-STEM dataset measured on a nanocrystalline material to a single 2D powder electron diffractogram, which is easy to process with standard software. The original version of 4D-STEM/PNBD method, which suffered from low resolution, was improved in three important areas: (i) an optimized data collection protocol enables the experimental determination of the point spread function (PSF) of the primary electron beam, (ii) an improved data processing combines an entropy-based filtering of the whole dataset with a PSF-deconvolution of the individual 2D diffractograms and (iii) completely re-written software automates all calculations and requires just a minimal user input. The new method was applied to Au, TbF3 and TiO2 nanocrystals and the resolution of the 4D-STEM/PNBD diffractograms was even slightly better than that of TEM/SAED. |
Databáze: | OpenAIRE |
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