Grain boundaries and defects in superconducting Bi-Sr-Ca-Cu-O ceramics

Journal Article

Ramesh, Ramamoorthy, B.G. Bagley, J.M. Tarascon, S.M. Green, M.L. Rudee, H.L. Luo

10.1063/1.345266

Defects and structural interfaces in superconducting Bi-Sr-Ca-Cu-O have been characterized by transmission electron microscopy. The superconducting phase exhibits frequent variations in the stacking sequence (polytypoids). Dislocations, observed inside the grains, either introduce or accommodate the shear in the a-b plane and the local composition fluctuations. In general, the grains exhibit a platelike morphology with the a-b plane as the grain boundary plane. Grain boundaries along the short edge are generally disordered, whereas those near the long edge generally have a thin layer of the lower Tc polytypoid. Coherent intragranular boundaries are also observed.

Journal of Applied Physics

67

1990

00218979

cited By 25

Ramesh Lab