Secondary grain-boundary dislocations in (001) twist boundaries in MgO. I. Intrinsic structures
Intrinsic secondary grain boundary dislocation (GBD) structures were observed by weak beam transmission electron microscopy in a variety of (001) twist boundaries in MgO prepared by a welding technique. Square networks of intrinsic screw GBDs were found in boundaries possessing twist deviations from the exact = 1, 5, 13, 17, 25, 29 and 53 Coincidence Site Lattice (CSL) misorientations. ( = fraction of lattice sites in coincidence). These GBDs were all perfect GBDs with Burgers vectors given by the primitive vectors of the corresponding DSC-Lattice except in the case of = 13 where a square array of partial screw GBDs was observed. Arrays of screw GBDs were not detected in a number of high boundaries. Super-imposed arrays of edge type intrinsic GBDs were observed in all boundaries when a small tilt component was present.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Materials Science and Engineering
- DOE Contract Number:
- AS02-78ER05002
- OSTI ID:
- 5265100
- Report Number(s):
- DOE/ER/05002-24; ON: DE82007798
- Country of Publication:
- United States
- Language:
- English
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Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELECTRON MICROSCOPY
GRAIN BOUNDARIES
LINE DEFECTS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY