Mg[B.sub.2] superconductors with abnormally improved [J.sub.c] sintered after autoxidation of milled original powders

The article explains a new approach, which can be employed for the synthesis of the Mg[B.sub.2] superconductors with abnormally improved [J.sub.c] simtered after autoxidation. The approach is shown to be extremely efficient, as it leads to the formation of these superconductors without adopting the several expensive nanodopants.