Abstract
Solid-solution range of the 30Å-phase in the Bi-Sr-Ca-Cu-O system has been studied mainly by powder X-ray diffraction. We have found that the 30Å-phase was formed topotactically on the 24Å-phase through a partial melting at around 730°C.
Effects of grinding on the 30Å-phase were examined by powder X-ray diffraction. It was found that the 30Å-phase changed into three types of fine powders by mechanical grinding; i.e., fine crystals of the original 30Å-phase, fine powder of a new phase (not identified) and an amorphous phase.
It was found that these powder produced a new unidentified phase and then partially melted on heating.
