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 36 for “"Iron-phosphate"”.
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Phase equilibria in iron phosphate system
… objectives of this research were to synthesize iron phosphate compounds, study phase equilibria in the iron phosphate system, focusing on the glass forming area, and investigate glass formability and properties based on the liquidus regions. Twelve iron phosphate compounds were successfully …
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Immobilization of radioactive materials in iron phosphate glass
… study investigates the feasibility of using iron phosphate glass for the immobilization of radioactive wastes considered incompatible with borosilicate glass. Wastes may be incompatible with borosilicate glass due to high phosphorus content (Hanford tank sludges), the presence of halides …
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Investigation of the thermodynamics of iron phosphate melts and stability of iron phosphate glasses: effects of composition and iron redox ratio
“Iron phosphate glasses with Fe/P = 0.33 - 0.67, O/P = 3.0 - 3.5 and Fe<sup>2+</sup>/ΣFe = 0.16- 0.52 were prepared by altering batch compositions and melt conditions. Thermal analyses indicate polyphosphate glasses with intermediate chain lengths are most stable against devitrification. …
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Novel lithium iron phosphate materials for lithium-ion batteries
… take million years to form and cause environmental degradation. In the 21st century, we have to aim at achieving sustainable, environmentally friendly and cheap energy supply by employing renewable energy technologies associated with portable energy storage devices. Lithium-ion batteries …
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Compositional tuning, crystal growth, and magnetic properties of iron phosphate oxide
Iron phosphate oxide, Fe3PO4O3, is a crystalline solid featuring magnetic Fe3+ ions on a complex lattice composed of closely-spaced triangles. Previous work from our research group on this compound has proposed a helical magnetic structure below T = 163 K attributed to J1-J2 competing interactions …
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Nanostrucured Lithium Iron Phosphate As Cathode Material For Lithium Ion-Batteries
… are less expensive, more energetic, and more environmentally friendly than the present ones. Of particular interest is the olivine-structured LiFePO4 cathode developed by Goodenough and co-workers, which offers several appealing features, such as a high, flat voltage profile and relatively high …
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Virus constructed iron phosphate lithium ion batteries in unmanned aircraft systems
Since lithium ion batteries first became commercially available in 1991, they have been repeatedly improved, continually redefining just how much we can do with electronic devices. Today, battery powered Unmanned Aerial Systems (UAS) the size of a model plane such as the Raven allow soldiers to see …
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Production of zinc iron phosphate glasses by microwave and conventional processing methods
This thesis describes the production of zinc iron phosphate glasses, xZnO-(40- x)Fe2O3-60P2O5 with x = 0, 2.5, 5.0, 7.5, 10.0 (mol%) using microwave and conventional processing methods. The work aiming to investigate the potential use of microwave processing method for the production of zinc iron …
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Structure and properties of iron phosphate glasses: A novel host matrix for the vitrification of high-level nuclear wastes
… and the chemical durability of vitreous binary iron phosphates of approximate batch composition 40Fe<sub>2</sub>O<sub>3</sub>-60P<sub>2</sub>O<sub>5</sub> (mol%) and those containing up to 40 wt% of one or more common nuclear waste components such as Na<sub>2</sub>O, CS<sub>2</sub>O, SrO, …
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Graphite immobilisation in glass composite materials
… Several potential glass compositions namely iron phosphate, aluminoborosilicate, calcium aluminosilicate, alkali borosilicate and obsidian were considered for the immobilisation of various loadings of graphite simulating irradiated graphite. The properties of the samples produced using …
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Lithium-ion battery modeling using non-equilibrium thermodynamics
… especially useful for materials such as lithium iron phosphate and graphite, which are currently modeled using a fit open circuit potential and an artificial phase boundary (in the case of lithium iron phosphate). This thesis work begins with a derivation of concentrated solution theory, …
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Sedimentology and diagenesis of Ediacaran phosphorites from South China
… provide a principal record of the paleoenvironmental and paleoecological conditions of the oceans during Earth's second major oxygenation and the evolution of complex life. Although the fidelity of this record is high, diagenesis and metamorphism frequently alter or overprint primary …
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Electrically insulating phosphate coatings for iron powder based electromagnetic core applications
Powdered metals, such as iron, are a common building block for electromagnetic cores. An iron powder was reacted with phosphoric acid to create a layer of iron phosphate on each particle. This electrically insulating phosphate layer could lead to significant reductions in eddy current losses in …
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Data-driven Modeling of Lithium Intercalation Materials
… chemo-mechanical coupling from images of lithium iron phosphate particles, and quantifying the autocatalytic reaction kinetics from X-ray diffraction of Li layered oxides. The results show the possibility to achieve full utilization of the datasets with quantitative agreement, enable model …
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An assessment of morphological, physical, chemical, and mineralogical properties of soils derived from volcanic deposits in Rwanda
… C is high and is associated with high sodium pyrophosphate extractable aluminum and iron. Phosphate retention is high and varied according to sodium pyrophosphate extractable aluminum and allophane contents. Soil cation exchange capacity, organic C, water retention properties, and aluminum and …
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Lifetime prediction for lithium-ion batteries undergoing fast charging protocols
… to lifetime prediction for 18650 lithium iron phosphate (LiFePO₄ LFP)/graphite cells subject to mixed galvanostatic and potentiostatic fast charging policies. Porous Electrode Theory is used to predict battery lifetime by parameteric reductions of effective solid-phase Fickian …
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Mathematical modeling of lithium-ion intercalation particles and their electrochemical dynamics
… separable battery materials, such as lithium iron phosphate and graphite. Mathematical modeling of the battery dynamics during charging/discharging will be helpful to better understand its mechanism, and may lead to future improvement in the battery technology. In this thesis, a new …
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Electrochemical to mechanical energy conversion
… electrode design, a cell consisting of lithium iron phosphate (LiFePO4) and carbon achieved 1.2% strain with a mechanical power output of 1000 W m 3 . Metals, on the other hand, provide colossal strains (hundreds of percent) upon lithium alloying, but do not cycle well. Instead, a …
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Operando investigations of mechanical changes in lithium-ion batteries
… and delithiation. Stress and Strain in Lithium Iron Phosphate Cathodes. We wondered whether in the asynchronous stress and strain behavior see in in LiMn2O4 would present in other common Li-ion cathodes. In this study, we employ in-situ stress and strain measurements to investigate …
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