ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Correlations between observed defect structures and the orientation of planes involved in grain boundary formation in single phase, nearly ideal density Ba2YCu3O7−x are presented. Three types of grain boundary structures are observed: (1) coherent boundaries with only a low-energy network of dislocations at the interface, which are associated with boundaries not involving a basal plane face, (2) semicoherent boundaries surrounded by a 50–1500 A(ring) wide band of dislocation loops on the c-axis side of the basal-plane-faced boundary, and (3) incoherent boundaries where severe local strain has produced substantial plastic deformation and generation of small voids, again associated with basal-plane-faced boundaries. These results are interpreted using a model for local stress based on the known highly anisotropic thermal contraction of the material during cooling from sintering temperatures.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.100502
