Transmission Electron Microscope Studies on High-Tc Superconductor Ba0.7Y0.3Cu1Ox

Abstract
Suscessful electron microscope observation was made for samples prepared by ion milling. Energy dispersive X-ray analysis showed that the composition of dominant phase was 18% Y, 29% Ba and 53% Cu in metal atoms. Plate like twins were observed in this phase; the twinning planes are {110} and the shape of twins is lenticular. This observation suggests that twins were induced mechanically to save the elastic energy produced during the phase transformation. Dislocations were also frequently observed in the phase. The directions of Burgers vectors are most likely to be 100 and 010.