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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Scanning Transmission Electron Microscope (STEM)"”.
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The Degradation of Spatial Resolution in Thin Foil X-Ray Microchemical Analysis Due to Plural Scattering of Electrons
… simulation of incoherent plural scattering of electrons has been developed in order to estimate the broadening of an electron probe as it propagates through a solid. By applying this approach to modeling the spreading of a fine (50 (ANGSTROM)) probe focused on a thin foil in a scanning …
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Disordering of small metal particles in a scanning transmission electron microscope
… seen to progressively disorder when the 100 keV electron beam of a Scanning Transmission Electron Microscope (STEM) is held stationary on the particle. The diffraction pattern of the individual particle is seen to progress from an initial array of indexable diffraction spots to a mixture of …
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Multi-dimensional Data Analysis in Electron Microscopy
… is presented and applied across a range of scanning transmission electron microscope (STEM) experiments. As a result, the Stark effect in quantum disks was mapped in a cathodoluminescence STEM experiment, and fully quantifiable 3D atomic distributions of a complex boron nitride core-shell …
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Cross-sectional transmission electron microscopy study of femtosecond laser-irradiated selenium-doped 'black' silicon
… at different temperatures were studied using transmission electron microscopy (TEM) and electron diffraction. The goal of the investigation was to characterize the structure of the laser-altered regions of the material. In addition, energy dispersive X-ray spectroscopy (EDX) was conducted in a …
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Josephson Junctions and Devices fabricated by Focused Electron Beam Irradiation
… Tc superconducting thin films with a focused electron beam, such as that obtained in a scanning transmission electron microscope (STEM), can result in the formation of a Josephson junction. The conditions required for the formation of these Josephson junctions in YBa2Cu3O7-d and related …
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Interface-Governed Optical Properties of Van der Waals Heterostructures
… opening a new way to design materials with novel electronic and optical properties. To design vdW heterostructures with desirable functionalities, proper interfacial engineering is essential as vdW interfaces between the layers govern the physical properties of the entire structure. In this …
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Impact of grain boundary character on the radiation-induced segregation morphology in proton-irradiated 316L austenitic stainless steel
… defect absorption efficiency. Electron backscatter diffraction is employed to select grain boundaries, and an additional pole figure analysis is implemented to select well-aligned 3{111} coherent twin boundaries. The local RIS at captured GBs is characterized in a two-pronged …
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Grain boundary chemistry and morphology of heavily doped cerium dioxide
Ceria is a model system for oxygen ion conducting ceramics of the cubic fluorite structure, in which grain boundaries are known to limit the overall ionic conductivity of polycrystals. Measurements of grain boundary segregation of the aliovalent dopants Gd3+ and Ta5+ in heavily doped ceria have …
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A study of oxide superconductors by electron energy loss spectroscopy in STEM.
… near boundaries to be observed. By using a Scanning Transmission Electron Microscope (STEM) to study the fluctuations in stoichiometry, the sub-nanometre probe (-0.5nm) allows spatial resolution on the nanometre scale. Coupling the nanometre spatial resolution with electron energy loss …
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Probing nano-scale atomic and electronic structures of iron-based superconductors
… in these materials. Investigating atomic and electronic structures is thus essential to help understand their interesting properties. In this thesis, I have investigated the bulk and thin-film form of iron-based superconductors by using a combination of scanning transmission electron …
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Kinetics of Buffer-Layer-Assisted Nanostructure Growth
… only 70 – 80 K. I have extensively utilized the transmission electron microscopes available in the Center of Microanalysis of Materials at the University of Illinois at Urbana-Champaign, to get insights into the key processes involved in nano-particle diffusion. My work has brought a new …
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Structure-property correlations in compositionally complex ferroelectrics
… characterization with an aberration-corrected scanning transmission electron microscope (STEM) to determine these structure-property correlations in two compositionally complex ferroelectric systems: compositionally heterogeneous relaxors and stoichiometry-controlled orthoferrites. Relaxor …