ISSN:
1573-2746
Keywords:
grain boundaries
;
twin boundaries
;
superconductors
;
coincidence site lattice
;
DSC-lattice
;
O-lattice
;
dislocations
;
YBa2Cu3O7-δ
;
constrained coincidences
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract The coincident-site lattice (CSL) model is now very familiar and widely used in the description of grain boundaries in cubic materials. Extension to other crystal structures is not completely straightforward because it is generally impossible to form three-dimensional CSLs for crystal lattices other than cubic unless certain conditions are met concerning ratios of the axial lengths and the interaxial angles. Small distortions of the natural crystal structure, however, can allow for the formation of constrained CSLs (CCSLs), which have associated DSC lattices and O2 lattices analogous to those used in the analysis of boundaries in cubic materials. In this paper, we briefly outline the CCSL theory and show examples of its application to YBa2Cu3O7-δ. We consider questions related to the dislocation contents of grain boundaries, the proportion of boundaries that might be expected to be well described by the model, and issues related to twin-boundary-grain-boundary intersections. The results of these analyses suggest somewhat different behavior than is expected for cubic materials. While the model is difficult to apply in detail, the general findings and the distinctions from cubic grain boundary geometry are useful in understanding certain aspects of the behavior of grain boundaries in YBa2Cu3O7-δ.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00188704
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