Abstract
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 PIT technology. Thin Mg layers were observed on plate-shaped MgB2 grain boundaries. Electrical measurements have shown high critical current densities in MgB2 layer, which are promising for further improvements and also for possible applications.
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