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Showing 1 to 20 of 46 for “"lattice strain"”.
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Lattice Strain and Texture of Plastically Deformed Zircaloy-2 at 77K
… and heavy water reactors. The intergranular strains and texture greatly affect the mechanical properties of the material while in operation. Understanding the plastic deformation of Zircaloy-2 will improve on current plastic deformation models, particularly for twinning mechanisms, which are …
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Lattice Strain Measurements of Deuteride Phase Formation in Epitaxial Niobium on Sapphire
… cycling. A residual out-of-plane compressive strain was observed in the 1200A Nb film after complete deuterium evolution. This observation can be explained by irreversible interstitial dislocation loop formation.
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In situ measurement of lattice strain using synchrotron radiation and a conical slit system
… utilizing synchrotron radiation to measure lattice strain components from an aluminum-lithium sample during tensile loading is presented in detail. The conical slit system at Argonne National Laboratory’s Advanced Photon Source is utilized to isolate a single grain with an orientation of …
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Measurement of Lattice Strain and Relaxation Effects in Strained Silicon Using X-ray Diffraction and Convergent Beam Electron Diffraction
… is not a proven reliable method for stress and strain measurements on the nanometer scale characteristic of these devices. The ability to correlate local strain values with processing parameters and device performance would allow for more rapid improvements and better process control. In this …
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Deformation mechanisms in bulk nanostructured aluminum obtained after cryomilling and consolidation by spark plasma sintering
… that there is a significant fraction of plastic strain (11%) that can be recovered after unloading. High-energy synchrotron X-ray diffraction experiments revealed that, there is a correlation between plastic strain recovery and microstructural evolution detected during in-situ loading-unloading …
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Determination of grain-level strain and proposing a new method of strain determination for three dimensional x-ray diffraction (3DXRD)
A new approach for lattice strain determination is proposed for analysis of three dimensional x-ray diffraction (3DXRD) data. Our objective is to establish a correspondence between lattice strain and change of diffraction spot position in $\omega$ ($\omega$ is the rotation angle about the loading …
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Microstructure, Tunable and Pyroelectric Properties of Laser-Ablated Ba (Zr0.25 Ti0.75) O3 Thin Films
… high degree of orientation in (011) plane, low lattice strain with respect to bulk have resulted in the high dielectric constant, tunability and pyroelectric coefficient. The improved crystallinity and low lattice strain with respect to bulk could be obtained at the high deposition temperature …
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Computational electronic structure studies of novel condensed matter phases
… The nucleation, kinetics, and correlation of lattice strain to the order-disorder superionic phase transition were explored through a combination of transmission electron microscopy and DFT. The correlation between lattice strain and superionicity is expanded upon in Chapter 4 where Prashant …
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Strain-phase relations in lead-free ferroelectric KxNa1-xNbO3 epitaxial films for domain engineering
… film properties on the basis of the strain-phase diagram. For this purpose, a fundamental understanding of the relation between incorporated lattice strain by epitaxial growth of thin films and the evolution of ferroelectric phases has been pointed out. As an exemplary lead-free …
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Characterisation of imperfections in single crystals of high purity synthetic quartz
… by electrodiffusion, or sweeping. Crystal lattice strain and sweeping damage was studied using double crystal topography at the Synchrotron Radiation Source, (SRS), at the Daresbury Laboratory. Metal ion impurities were shown to incorporate interstitially into quartz crystals. The only …
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Microstructural evolution and mechanical behavior in nickel based alloys for very high temperature reactor
… by performing tensile tests at three different strain rates and at temperatures up to 1000ºC. This range covers time-dependent (plasticity) to time-independent (creep) deformations. At temperatures from 300 to 700ºC, the yield strength was found to be temperature independent as a result of …
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Microstructural study of intergranular M23C6 precipitates in Alloy 709
… the parent austenite grain while maintaining a lattice correspondence, 3·aM23C6 ≈ aγ-Fe. The lamella-shaped M23C6 precipitates on the twin boundaries also exhibited the analogous growing behavior. In situ synchrotron XRD tensile tests were performed to reveal the mechanical response of the …
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Engineering Functional Defects in Oxides Using External Stimuli
… effects of external stimuli, specifically with lattice strain, oxygen chemical potential, chemical doping, and ion irradiation, in tailoring the concentration and stability of these critical defects in oxides to boost their functionalities. The findings and methodologies provided in this thesis …
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Solvent-induced modifications of the morphology and solid-state properties of ibuprofen
… grown from non--polar solvents were more strained. In conjunction with solution NMR results (which showed differences in molecular association in solvents of varying polarity) this led to two different growth mechanisms being proposed. The crystal structure of resolved S(+) ibuprofen …
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Theory and experiments of type-II superlattice infrared photodetectors
The InAs/GaSb type-II superlattices have drawn extensive research interest in the past few decades. The type-II band alignment in this material system provides a long cutoff wavelength and a wide optical tunable range in the mid-infrared regime. Photodetectors based on type-II superlattices are …
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A combined electrochemical and x-ray photoelectron spectroscopic approach to electrocatalysis
… consistent with electronic effects induced by lattice strain, charge transfer, and orbital rehybridization. In order to provide more information on the nature of electronic effects in metal-metal bonds, the core-level binding energies of underpotentially-deposited copper and silver on a Rh(111) …
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First Principles Investigations of Solid-Solid Interfaces in Lithium Battery Materials
… the effects of varying configurations and lattice strain. This scheme is successfully applied to the modeling of likely interface geometries of several solid state battery materials including Li metal, Li$_3$PO$_4$, Li$_3$PS$_4$, Li$_2$O, and Li$_2$S. This formalism, together with partial …
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Toward the Synthesis and Characterization of Pb-Doped ZnS Nanocrystals for Solar Energy Applications
… difficult, as the dopants can cause significant lattice strain in the host crystals. Lead-doped ZnS nanocrystals are one promising material for the conversion of solar photons into storable fuels such as hydrogen gas. The ZnS conduction band is sufficiently high in energy to reduce protons, and …
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Modelling of Structure-Property Relationships in Perovskites
… functional calculations, including simulation of lattice strain.
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Investigation of the mechanical behavior of rim/blister structure hydride phases in Zircaloy-4 by utilizing high energy synchrotron X-ray diffraction
… was investigated. More specifically, the stress-strain behavior of the zirconium and zirconium hydride phases were studied at 200 C with different hydrogen concentrations. The hydride phase was intentionally created with a rim/blister (a region with high density of hydride) within the sample, …
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