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Texture improvements in the high-temperature superconducting Bi₂Sr₂Ca₁Cu₂Ox̳/Ag system via surface energy driven grain alignment

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dc.contributor.advisor John B. Vander Sande. en_US Vodhanel, Mark E en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Physics. en_US 2006-05-15T20:33:44Z 2006-05-15T20:33:44Z 2005 en_US 2005 en_US
dc.description Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2005. en_US
dc.description In title on t.p., double-underscored "x" appears as subscript. en_US
dc.description Includes bibliographical references (leaf 40). en_US
dc.description.abstract The relation between processing, microstructure, and material property was investigated in the high-temperature superconducting Bi₂Sr₂Ca₁Cu₂Ox̳/Ag system. Experiments were based on a theoretical surface energy model proposing enhanced texture of the oxide at the Ag interface after melt-processing. Two classes of samples were processed and compared. Bi-2212 powder was deposited on a thin-foil Ag surface and was melt-processed to yield a 20 ± 10 micron-thick superconducting layer. A subset of these samples were processed with an additional Ag surface pneumatically pressed on top of 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 technique for quantifying grain alignment via the Lotgering factor, and indicated samples with the upper Ag interface possess a higher degree of texturing. Our results support the interfacial energy model that a high degree of texture exists at the Ag surface, and provide clear evidence linking materials processing, superconducting grain alignment, and critical current density. Disparities observed in J for similarly processed samples were believed to be a consequence of local regions of alignment and the presence of impurities. en_US
dc.description.statementofresponsibility by Mark E. Vodhanel. en_US
dc.format.extent 40 leaves en_US
dc.format.extent 1556162 bytes
dc.format.extent 1555845 bytes
dc.format.mimetype application/pdf
dc.format.mimetype application/pdf
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.subject Physics. en_US
dc.title Texture improvements in the high-temperature superconducting Bi₂Sr₂Ca₁Cu₂Ox̳/Ag system via surface energy driven grain alignment en_US
dc.type Thesis en_US S.B. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Physics. en_US
dc.identifier.oclc 61356861 en_US

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