Global ETD Search
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 16 of 16 for “"planar defects"”.
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Investigation Of Parallel Planar Defects And Texture Transformation In Electron Beam Evaporated Silver Thin Films
… for texture transformation exists. Nanotwin defects have been observed in numerous face-centered cubic metal thin films and may be a driving force for texture transformation; whether or not film nanotwin density is affected by changes in deposition parameters is not yet agreed upon. The …
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Some effects of dimensionality and defects on superconductivity
… fails. In Chapter 3, we consider the effect of planar defects on the superconductivity of Sr2RuO4 thin films. We find that while parallel planar defects does not decrease the the transition temperature of superconductivity, defects that are perpendicular with each other are able to suppress the …
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Two -Photon Polymerization of Defects in Photonic Crystals
… may exhibit a complete PBG) with embedded air defects. Embedded planar defects in silicon colloidal photonic crystals were optically characterized and high resolution embedded air defects in silicon-air inverse opals were demonstrated, representing a major step forward in providing a platform …
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Dynamics of Driven Vortices in Disordered Type-II Superconductors
… transport for flux lines driven through planar defects via novel direct measurements of vortex excitations.
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Computer simulation of lattice defects in Ni₃Al
… estimated potentials were used to study the defects in Ni₃Al. A computer program which uses the conjugate gradient technique to obtain the relaxed structures was used. Atoms in the vicinity of the planar defects on the (111) plane were found to relax in two different oscillation modes namely …
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The influence of mixed hexagonal close-packed and face-centered cubic ordering on precipitation pathways and kinetics in sputtered superalloys
… is inconsistent with bulk behavior. The rich planar defects present in the DCMS Haynes® 242™ used in this investigation caused the material to contain both face-centered cubic (FCC) and, unexpectedly, significant amounts of hexagonal close-packed (HCP) domains. This mixed close-packed crystal …
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Ion-beam processes in group-III nitrides
… such as lattice amorphization, formation of planar defects, preferential surface disordering, porosity, decomposition, and quenching of CL. These effects are often technologically undesirable, and the work of this thesis has indicated, in some cases, how such effects can be minimized or …
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Ion-beam processes in group-III nitrides
… such as lattice amorphization, formation of planar defects, preferential surface disordering, porosity, decomposition, and quenching of CL. These effects are often technologically undesirable, and the work of this thesis has indicated, in some cases, how such effects can be minimized or …
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Eddy current detection of fatigue cracks in drill pipes
… only sensitive to surface and near surface defects. This proves to be a major limitation - the external drill pipe surface is obstructed by flanges and fittings such that continuous inspection of the external surface would be impossible. Therefore two specialised eddy current methods to …
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Characterization of residual stresses in birefringent materials applied to multicrystalline silicon wafers
… to determine stresses at linear and planar defects can have important consequences in the electrical performance of devices such as electronics and photovoltaic cells. This thesis presents the results of an experimental investigation of residual stresses in multicrystalline silicon …
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Electronic structure and energetics of Fe-based superconductors: Effects of chemical and magnetic disorder in (Ba-X)(Fe-Y)2As2
… that lead to competing magnetic and structural defects. Because of this, exploration of the electronic structure of the normal (non-SC) state, and its related properties, may reveal key physics underlying connections between structure, magnetism and SC. In this thesis we study the phase …
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Atomistic Modeling of Defect Energetics and Kinetics at Interfaces and Surfaces in Metals and Alloys
Planar defects such as free surfaces and grain boundaries in metals and alloys play important roles affecting many material properties such as fracture toughness, corrosion resistance, wetting, and catalysis. Their interactions with point defects and solute elements also play critical roles on …
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In-situ electron imaging of oxidation and reduction of rutile (TiO2) nanocrystals and interaction with palladium
… and the formation and rearrangements of defects. Here, we demonstrate that such structural changes can be directly observed using the new and improved environmental transmission electron microscopy (ETEM) methods. We focus on the surface and interface of TiO2 nanocrystals and Pd …
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Structure-property correlations in compositionally complex ferroelectrics
… the ferroelectric ordering. In addition, planar defects such as antiphase boundaries (APBs) are also found in Y-rich YFO, which show large structural relaxations. Despite Y-rich composition, these APBs also host FeY antisites, exhibiting bi-stable polar distortions. Density functional …
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Laser Crystallization of Silicon Thin Films for Three-Dimensional Integrated Circuits
… distinct regions with varying densities of planar defects and/or crystallographic orientations. As a result, transistors fabricated within such films can potentially exhibit relatively poor device uniformity. To address this issue, we employ advanced SLS whereby Si films are prepatterned …
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Electron diffuse-scattering fluctuation and correlation analysis in complex face-centered-cubic alloys via four-dimensional scanning transmission electron microscopy
… 1/3 {422} and 1/2 {311} signals stem from {111} planar defects, while their homogeneous-matrix counterparts were attributed to thermal diffuse scattering (TDS). Notably, neither of these signals were linked to CSRO. In contrast, the {110} diffuse-scattering peaks were associated with …