PISA – FEI Tecnai Transmission Electron Microscopy Laboratory (TEM)
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The Transmission Electron Microscopy TEM laboratory is a state-of-the-art facility equipped with a FEI Tecnai G2 F20 X-Twin transmission electron microscope and a FEI FIB200TEM Focused Ion Beam device for specimen preparation. The laboratory provides powerful techniques for characterization of crystal structure, microstructures and chemical composition of materials down to a near atomic level.
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Instrument
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Transmission Electron Microscope
Transmission Electron Microscopy (TEM) are patterned after Transmission Light Microscopes and will yield similar information.
Morphology: The size, shape and arrangement of the particles, which make up the specimen as well as their relationship to each other on the scale of atomic diameters.
Crystallographic Information: The arrangement of atoms in the specimen and their degree of order, detection of atomic-scale defects in areas a few nanometers in diameter
Compositional Information (if so equipped): The elements and compounds the sample is composed of and their relative ratios, in areas a few nanometers in diameter
A TEM works much like a slide projector. A projector shines a beam of light through (transmits) the slide, as the light passes through it is affected by the structures and objects on the slide. These effects result in only certain parts of the light beam being transmitted through certain parts of the slide. This transmitted beam is then projected onto the viewing screen, forming an enlarged image of the slide. TEMs work the same way except that they shine a beam of electrons (like the light) through the specimen (like the slide). Whatever part is transmitted is projected onto a phosphor screen for the user to see. [Source: University of Nebraska-Lincoln] (Source: Global Change Master Directory (GCMD). 2023. GCMD Keywords, Version 16.3. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects pision, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords)