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 42 for “"critical current density"”.
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Critical current density in hot-pressed garnet Li7La3Zr2O12 solid state electrolytes
… of the most promising ways to increase energy density. To avoid dendrite problems caused by lithium metal anode, many kinds of solid state electrolytes are reported. Garnet Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12 </sub>has high chemical and electrochemical stability with lithium …
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Increased critical current density in rapidly grown RE-based cuprate superconducting coated conductors
… stage, is also investigated. This method is currently used industrially by SuNAM Co. Ltd., a collaborator on this project. We show that it is possible to replicate the liquid-assisted process used at the factory via pulsed laser deposition in a vacuum chamber. We use these results to …
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Non-fluorine precursor solutions for high critical current density REBa₂Cu₃O₇₋x̳ films
… precursor solution for YBCO films with high critical current densities (Jc). An aqueous nitrate precursor solution system was selected from three possible precursor solution systems. It was further developed to produce YBCO films with Jc > 1 MA/cm2. Films up to ~800 nm thickness were made, …
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Strombegrenzende Mechanismen YBa2Cu3O7-[delta]-Dünnschichten und -Quasimultilagen
… electrical transport properties and the maximum current carrying capability of YBa2Cu3O7-[delta] thin films and so called quasi-multilayers are investigated. These samples are prepared with pulsed laser deposition on single-crystalline substrates (SrTiO3) as well as on biaxially textured Ni …
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YBa2Cu3O7-x thin films prepared by Chemical Solution Deposition
… of high Tc-superconductors require large critical currents and high-applied magnetic fields. Effective ways to increase the critical current density at high magnetic fields in YBCO are the introduction of nanoparticles and chemical substitution of yttrium by other rare earth elements. …
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Microstructural control and superconducting properties of YBa₂Cu₃O₇₋ₓ melt textured single crystals
… for these applications, largely depends on the critical current density and loop size of the superconducting current, large-sized single crystals with high critical current density are desired. To achieve the goal in fabricating YBa₂Cu₃O₇₋ₓ(Y123) samples suitable for the applications, detailed …
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Mechanisms of Metal Penetration in Solid Electrolytes
… electrolyte during electrodeposition, and at the critical current density these stresses drive brittle fracture within the bulk to create paths for metal advancement. This thesis demonstrates that metal penetration depends on two additional factors. The first is whether electric field focusing is …
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Grain boundary networks in RABiTS based YBa2Cu3O7[-delta] coated conductors
… thesis deals with the transport properties and critical current limitations found in YBa2Cu3O7[-delta] coated conductors prepared by the "rolling assisted biaxially textured substrate" (RABiTS) approach. For this purpose a buffer layer system composed of CeO2 and yttria-stabilised …
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Texture improvements in the high-temperature superconducting Bi₂Sr₂Ca₁Cu₂Ox̳/Ag system via surface energy driven grain alignment
… the superconducting layer before heat treatment. Critical current density (...) measurements were performed in liquid helium and we obtained values ranging from 5,900-36,700 A/cm². A 3-6 fold increase in ..., for samples with the second Ag interface was observed. X-ray diffraction provided a …
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Potentiostatic polarization and the corrosion of nickel-chromium- iron-molybdenum alloy 825
… 825 test electrode and measuring the resulting current. In both acids, there is no difference in the polarization characteristics in air-or nitrogen-saturated solutions. In 1.0 to 15.0 normal sulfuric acid at 25 to 60°C, the alloy spontaneously passivates and does not exhibit a significant …
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Microstructure and phase development in yttrium barium(2) copper(3) oxygen(7) superconducting films prepared from carboxylate precursors
… film properties, such as transition temperature, critical current density, and weak-link behavior, were investigated. The precursor trimethylacetate salts were dissolved in propionic acid/amylamine mixed solvent system, resulting in stable solutions suitable for coatings. Thin films were deposited …
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Applications of High-Intensity Ultrasound for Synthesis and Modification of Advanced Materials
… of superconductors are determined by the critical current density, above which a superconductor becomes resistive and dissipates energy. To increase the critical value, small defects are introduced into the superconductor's bulk (""pinning""). Ultrasonic irradiation of alkane slurries …
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Electro-chemo-mechanical instabilities at interfaces in al-solid-state lithium-ion batteries
… a significant improvement in cell-level energy density compared to the state-of-the-art. Recent improvements in the ionic conductivity of ceramic SSEs have invigorated commercial interest, prompting investigations into SSE/electrode interfacial properties. However, these investigations have …
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Fabrication and Electronic Transport Properties of Underdoped High Temperature Superconductor Nanowires
… on a mesoscopic length scale. We have measured current-voltage characteristics, resistivity, and critical current density all as a function of temperature, width, and orientation relative to the crystal axes. The resistivity displays large fluctuations within a temperature regime from Tc to …
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Fabrication and Electronic Transport properties of Underdoped High Temperature Superconductor Nanowires
… on a mesoscopic length scale. We have measured current-voltage characteristics, resistivity, and critical current density all as a function of temperature, width, and orientation relative to the crystal axes. The resistivity displays large fluctuations within a temperature regime from Tc to …
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Some effects of dimensionality and defects on superconductivity
… can be utilized to produce wires with larger critical current density.
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Electrical and magnetic properties of twin-free single-crystal praseodymium-doped YBa2Cu3O7-d
… and Pr concentration dependences of the critical current density. However, at temperatures near Tc, our results indicate that a higher flux pinning energy correlates with a higher critical current density. We measured the normal and mixed state Hall and longitudinal resistivities of …
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The Electronic Properties of Thin Film YBa2Cu3O7 Low Angle Grain Boundaries
Critical currents in the latest biaxially textured ‘coated conductors’ are now limited by 2D networks of low angle grain boundaries (LAGBs) with misorientation θm = 1 - 10°. In order to understand and optimise current transfer in these materials it is essential to elucidate the electromagnetic …
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Reel-to-reel Characterization towards Feedback Control in Manufacturing Long REBCO High-Temperature Superconducting Tapes
… has been implemented for profiling the off-line critical current density of High-Temperature Superconducting (HTS) tapes. A cross-comparison on sensitivities via principle analysis and simulations incorporating various types of magnetization methods reveals that a combination of self-field …
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