Grain boundaries and defects in superconducting Bi-Sr-Ca-Cu-O ceramics
- 1 January 1990
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 67 (1) , 379-387
- https://doi.org/10.1063/1.345266
Abstract
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.This publication has 25 references indexed in Scilit:
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