Einfluss von Präparation und Dotierung auf die supraleitenden Eigenschaften in mechanisch legiertem Magnesiumdiborid (English shop)

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The dissertation “Influence of Preparation and Doping on the Superconducting Properties of Mechanically Alloyed Magnesium Diboride” by Marko Herrmann investigates the preparation and optimization of superconducting magnesium diboride (MgB₂). The research focuses on mechanical alloying of magnesium and boron powders, the influence of starting material composition and powder quality, and doping with carbon-based additives. X-ray diffraction, electron microscopy, electrical transport measurements, and magnetic characterization are employed to analyze the relationships between microstructure, phase formation, and superconducting material properties. Particular attention is given to critical current density, superconducting transition temperature, upper critical magnetic fields, and magnetic flux pinning mechanisms. The study also examines the fabrication of carbon-doped MgB₂ conductors using powder-in-tube technology. By optimizing processing conditions and doping strategies, the research aims to enhance current-carrying capacity and improve the suitability of magnesium diboride for technological applications. The findings contribute to the development of high-performance superconducting materials and conductor technologies.