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We have analyzed the microstructure of dense pore-free undoped MgB2 single filament wire made by internal magnesium diffusion process (IMD). The superconducting layer consists of nearly pure MgB2 matrix with small volume fraction of nano-sized Mg and MgO precipitates and some of amorphous or nanocrystalline B-rich grains. Content of oxygen in IMD wire was significantly suppressed in comparison to...
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