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 20 of 22 for “"in situ X-ray diffraction"”.
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The development of an in-situ X-ray diffraction cell for Fischer-Tropsch catalyst characterisation
In the current study, the successful development of a novel in-situ X-ray diffraction cell is described. This cell allows the direct observation of crystallite changes to be made under reaction conditions and in real time. The cell permits operation up to 500°C and 25 bar to be realised, with more …
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An in-situ x-ray diffraction study of decomposition kinetics in a nickel-12.5 at.\% aluminum alloy
… 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:58:06Z Item is restricted indefinitely.
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Materials discovery using in situ reduction and X-ray diffraction
Materials discovery is important for pushing new and existing technologies forward. In this thesis, a systematic approach to materials discovery is presented that highlights the combined use of in situ reduction reactions and X-ray diffraction to quickly explore compositional space. Reduction …
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Thermodynamic and kinetic examinations of inorganic materials formation
Inorganic materials formation is the result of a complicated interplay between thermodynamics and kinetics. Improved understanding of such factors can aid the synthesis of target materials and the discovery of new materials. Here, techniques for carrying out time-resolved studies were developed and …
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Microstructural Investigations of the Layered Cathode Materials LiCoO2 and LiNi1/3Mn1/3Co1/3O2
Both LiCoO2 and LiNi1/3Mn1/3Co1/3O2 layered cathode materials are investigated in our studies. P3 phase of CoO2, the end member of the LixCoO2, is found in both chemically and electrochemically delithiated materials. Delithiated LixCoO2 specimens decompose into fine Co3O4 and LiCoO2 particles …
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Scalable manufacturing of hierarchical nanostructures for thermal management
… simple and scalable process to make surface coatings that have multiple length scales, or hierarchical features. Typically, the formation of hierarchical structures involves multiple steps and/or long processing times. In this new process, the hierarchical geometry is formed in a single step. The …
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Rapid materials discovery of ternary transition metal chalcogenides
Search for new functional inorganic materials has been a perennial focus of materials science and plays a crucial role in uncovering novel phenomena. One class of materials that has particularly drawn tremendous attention is that of transition metal chalcogenides exhibiting strong d-electron …
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A layered sodium titanate as promising anode material for sodium ion batteries
… have been proposed, it's quite challenging to develop suitable anode materials with high energy density and good cyclability for sodium ion batteries. Herein, we report a layered material, 03-NaTiO2, that delivers 130mAhg-1 of reversible capacity and presents excellent cyclability with …
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Evaluating the Thermal Stability of Nanocrystalline Ag-Cu Alloys
Nanocrystalline alloys offer multitudinous advantages over their larger-grained counterparts including increased strength, hardness, resistance to fatigue, and more. However a significant barrier to their implementation is their low thermal stability—they are prone to coarsening at very low …
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Electrochemical H insertion in Pd thin films
Metal hydrides are pertinent to several applications, including hydrogen storage, gas separation, and electrocatalysis. The Pd-H system is used as a model for metal-hydrogen systems and the effect H insertion has on their properties. A study was conducted to assess the performance of various …
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Investigation of mechanical behavior of Alloy 709 for advanced fast reactor applications
… of next-generation nuclear reactor systems brings with it a multitude of material challenges. The structural materials to be used for these reactors will be exposed to more extreme conditions of radiation, stress, and temperature than those of prior generations. The development and …
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Towards Crack-Resistant Polycrystalline Zirconia Shape-Memory Ceramics with Low Hysteresis
… Despite these potential benefits, two shortcomings have prevented these materials from reaching their full potential: i) polycrystals catastrophically crack during the martensitic transformation, and ii) the transformation exhibits a large hysteresis of over 150 K. It is yet unknown what drives …
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Exploring Pressure-Induced Structural Changes and CO2 Adsorption in Flexible Metal-Organic Frameworks
… capabilities have marked them as promising candidates for selective carbon capture. Flexible MOFs feature dynamic frameworks that can reversibly change structure in response to external stimuli, thereby exhibiting unique performance as CO2 adsorbents. The "gate-opening effect" of …
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Cation-disordered oxides for rechargeable lithium battery cathodes
… for rechargeable lithium batteries are ever increasing. This is because such cathode materials will enable smaller and lighter rechargeable lithium batteries for complex applications such as in electric vehicles or in grid energy storage. Nearly all high-energy density cathode materials for …
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High-temperature structural properties of the refractory rare-earth tungsten oxides
This thesis presents an investigation of the high-temperature structural behaviour of two types of rare-earth tungsten oxide compounds. Included are first-time descriptions of phase transformation and thermal expansion phenomena in Ln6WO12 (Ln= Y, Ho, Er, Yb) and Ln2WO6 (Ln= Gd, Dy, Y, Ho, Er, Yb) …
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Understanding and Controlling Failure Mechanisms of the Zinc Anode for Rechargeable Alkaline Batteries
<p>In the coming years, the transformation of the electric grid will be in part enabled by safe, low-cost, and reliable large-scale rechargeable battery energy storage systems. Zinc (Zn) alkaline electrodes hold great importance and promise in the battery technology community as they satisfy the …
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Controlling properties of functional oxides by tuning oxygen defect chemistry
Oxygen defects are essential building blocks for properties and functionalities of oxides, including electrical conductivity, magnetism, ferroelectricity as well as catalytic and electrocatalytic activity. Therefore, fundamental understanding of how to tune the oxygen defect chemistry is essential …
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The Effect of Zr-Doping and Crystallite Size on the Mechanical Properties of TiO2 Rutile and Anatase
… as white pigment, as wide band gap semiconductor in electrochemical dye solar cells, for photocatalysis and in photochemical energy-conversion processes. The most abundant phases are rutile, anatase and brookite. In addition, there are a number of metastable low density modifications. The …
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The Influence of Amorphous, Sub-Micrometer Silica Particles in Cement Pastes and Mortars with Very Low Water-to-Cement Ratios (Ultra-High Performance Concrete)
The focus of this work is to describe the influence of amorphous, sub-micrometer silica particles in UHPCs. The present literature is equivocal about whether silica enhances clinker hydration due to its dissolution and subsequent pozzolanic reaction to calcium–silicate–hydrate phases (C–S–H phases) …
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Interactions between catalysts and oxygen carriers in chemical looping processes
… a reactive metal oxide, applied for chemical looping processes, using Ag/SrFeO3−δ as a model system. In chemical looping processes, lattice oxygen is provided from a metal oxide (termed the oxygen carrier) to generate purified oxygen, or, to react with a reducing gas (e.g. a hydrocarbon) to form …
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