Electron Diffraction and Microscope Study of Radiation Damage in Ba2YCu3Oy

Abstract
Electron induced radiation damage in a high T c superconductor Ba2YCu3O y , where y varies from 5.8 to 6.5, was examined by electron diffraction and high resolution transmission electron microscopy (HRTEM). Disordering of Ba and Y layers in the A-sites of the tri-perovskite structure is induced by an intense electron irradiation. Radiation induced product probably has a cubic structure with a=0.41 nm, which is slightly larger than a, b and c/3 values, 0.38-0.39 nm, of an original Ba2YCu3O y structure.