The process synthesis of bulk superconductors

This paper discusses how, using a variety of different processes, it is possible to produce rare earth-Ba/Sr-Cu-O type bulk superconductors with critical temperatures (Tc) in the 90 K range, well above the liquid nitrogen temperature of 77 K. The techniques that produce powder material superconductors need to have particle sizes in the submicrometer range in order to have nearly theoretical densities after compaction and shape forming. Major breakthroughs also are needed in the preparation of high-Tc and high critical current density material superconductors in order for the applications to be viable