Theses--Materials Science and Engineering
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Investigation of Surface Peening Technologies for Addressing Stress Corrosion Cracking in Used Fuel Dry-Cask Storage Stainless Steel Canisters
(2023-08-23)Nuclear power serves as a vital and sustainable global energy source. The safe, secure, and enduring storage of spent nuclear fuel is an important focus of the nuclear industry. In the United States, as in many nations ... -
Synthetic and dynamic control in strongly correlated transition metal oxides
(2022-07-31)Binary and mixed oxides incorporating transition metal cations host a broad range of scientifically compelling and technologically significant optical, electronic, and magnetic properties. Transition metal oxides (TMOs) ... -
Photoinduced Structural Phenomena in Ferroelectric Oxide Electronic Materials Investigated by Synchrotron X-ray Diffraction
(2020-07-01)My thesis research investigates photoinduced phenomena in ferroelectric electronic oxide materials, with a focus on changes that occur on sub-nanosecond timescales and length scales ranging from single unit cells to the ... -
Epitaxial and Lateral Solid-Phase Crystallization of Complex Oxides
(2019)The crystallization of complex-oxide materials through a transformation from the amorphous to crystalline forms presents a range of new opportunities to synthesize new materials, and simultaneously poses important scientific ... -
Atomic Scale Medium Range Order and Relaxation Dynamics in Metallic Glass
(University of Wisconsin-Madison, 2017)We studied the atomic scale structure of bulk metallic glass (BMG) with the combination of fluctuation electron microscopy (FEM) and hybrid reverse Monte Carlo (HRMC) simulation. Medium range order (MRO), which occupies ... -
Structure Study of Magnetic Thin Films for Voltage Controlled Spintronics by Scanning Transmission Electron Microscopy Experiment and Density Functional Theory Calculations
(University of Wisconsin-Madison, 2017-11-15)We have studied magnetic thin films for voltage controlled magnetic tunnel junctions (MTJs) by advanced scanning transmission electron microscopy (STEM) and density functional theory (DFT) simulations. MTJs are the ... -
Local Structure Analysis of Model Metal-Metal and Metal-Metalloid Metallic Glasses
(University of Wisconsin-Madison, 2019-02-28)Materials scientists lack a general, abstract description of the atomic structure of metallic glasses (MGs). Structural descriptions developed for crystals and crystal defects are ineffective because the amorphous structure ... -
Advanced Electron Microscopy of Novel Ferromagnetic Materials and Ferromagnet / Oxide Interfaces in Magnetic Tunnel Junctions
(University of Wisconsin-Madison, 2013-10)We have studied novel ferromagnetic (FM) materials and FM electrode/tunnel barrier interfaces in magnetic tunnel junctions (MTJs) by advanced electron microscopy including scanning transmission electron microscopy (HRSTEM) ... -
Nanoscale Structural Characterization of Oxide and Semiconductor Heterostructures
(2018-10-11)According to a recent report from International Technology Roadmap for Semiconductors (ITRS), semiconductor industry based on silicon Complementary metal–oxide–semiconductor (CMOS) technology is facing challenges in terms ... -
Nanoscale Strontium Titanate Sheets and Crystals
(2018-01-23)The physical properties of materials are dominated by their structure and composition. Insight into the structure of complex oxide materials has the potential to improve our understanding and eventually control of their ... -
Size Effects in Nanoscale Structural Phenomena
(2017-07-17)The creation of nanostructures offers the opportunity to modify and tune properties in ways inaccessible in bulk materials. A key component in this development is the introduction of size effects which reduce the physical ... -
Nanosecond Structural Dynamics of Ferroelectric Oxide Thin Films
(2013)The functionalities of ferroelectric materials are closely related to the switchable spontaneous polarization and the polarization-structure coupling. A persistent effort has been made since the discovery of ferroelectricity ... -
Electric Field Response of Strained BiFeO3 and BaTiO3/CaTiO3 Superlattices
(2015)Complex oxide materials can be driven into transient structural configurations using applied electric fields. Structural changes significantly impact the functional properties of these materials, including their piezoelectricity. ... -
Quantitative Scanning Transmission Electron Microscopy of Electronic and Nanostructured Materials
(2015-05-07)This thesis reports studies of electronic and nanostructured materials by advanced electron microscopy (EM) techniques, including scanning transmission electron microscopy (STEM), position averaged convergent beam electron ... -
Medium Range Order in High Aluminum Content Amorphous Alloys Measured by Fluctuation Electron Microscopy
(2007)High Al-content metallic amorphous alloys have an unusual devitrification behavior. Upon annealing, alloys made by a rapid quench develop a high density (>1021 m-3) of pure Al nanocrystals. These alloys show a steadily ... -
TEM Characterization of Microstructure and Chemistry in Magnesium Diboride Superconductor
(2008)MgB2 is a superconductor with promising properties, but to meet application requirements, the properties of MgB2 have to be improved through microstructure modifications: chemical doping, introduction of precipitates, ... -
Medium-range Order in Al-based Metallic Glasses
(2011)Medium range order (MRO) is the structure order existing between the short range order and long range order in amorphous materials. Fluctuation electron microscopy (FEM) is an effective method to quantify MRO. The FEM ... -
Nanometer Scale Atomic Structure of Zirconium Based Bulk Metallic Glass
(2011)We have studied the nanometer scale structure of bulk metallic glass (BMG) using fluctuation electron microscopy (FEM). The nanometer scale medium range order (MRO) in BMG is of significant interest because of its possible ...
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