Processing Considerations for Adding Nanometer-Scale Oxides to Enhance Flux Pinning in High-Temperature Superconductors
Several nanometer-scale oxide inclusions were added to Bi2Sr2CaCu2Ox high-temperature superconductors to determine their effectiveness in creating intragranular flux-pinning sites. Powder pellets were fabricated and heat treated by partial-melt processing. Effects of the additives on melting response, superconducting properties, and microstructural development were examined. Al2O3 additions exhibited the most promise for forming stable pinning centers, ZrO2 and SnO2 additions were moderately promising, TiO2, Fe2O3, and ZnO additions were less promising, and Y2O3 additions destroyed superconductivity.
KeywordsScale Oxide Oxide Addition Flux Pinning Scanning Electron Microscopy Photomicrograph Dope Specimen
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