APFIM OBSERVATIONS OF VARIOUS FORMS OF HTSCS

High-temperature superconductor (HTSC) materials are now being prepare d in several different forms, including polycrystalline wafers, single -crystals, bi-crystals, thin films and metal-clad wires and ribbons. A tom probe field ion microscopy (APFIM) investigations may now be perfo rmed with material in each of these starting forms, enabled by the met hod of sharp-pointed shards (MOSS). Initial experiments are described here, including progress in the structural and local compositional cha racterization of thin-film YBCO material.