The migration of grain boundaries in ceramic materials with particular reference to the sintering process: Final report for the period July 15, 1982-May 14, 1984
The progress made during the first two years of a program to study the migration of grain boundaries in ceramic oxides is reported. The principal results of the program are concerned with the structure of grain boundaries in ..cap alpha..-Al/sub 2/O/sub 3/, although important new information has also been obtrained on grain boundaries in spinels and both germanium and silicon. Attention is focussed on the basal twin boundary in ..cap alpha..-Al/sub 2/O/sub 3/ which had been identified as a model interface in early work. A series of new grain boundaries exemplified by the (1123) twin are also discussed briefly as is the rhomobohedral twin interface. Earlier results on the first-order (..sigma..=3) twin in spinel have been extended with the development of models for the computer-simulation of high-resolution TEM images of these interfaces. A study of low-angle grain boundaries in spinel is giving new insight into the effect which the large size of the unit cell and the multiplicity of cations can have on structure of interfaces in ceramic materials in general. Finally the direction of the program in examining grain boundaries in covalent materials (Ge and Si) is discussed.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA). Dept. of Materials Science and Engineering
- DOE Contract Number:
- AC02-82ER12076
- OSTI ID:
- 7225131
- Report Number(s):
- DOE/ER/12076-T2; ON: DE87003372
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Migration of grain boundaries in ceramic materials with particular reference to the sintering process. Final progress report, July 15, 1982-May 14, 1984
Migration of grain boundaries in ceramic materials with particular reference to the sintering process. Progress report, December 1, 1984-September 30, 1985
Related Subjects
ALUMINIUM OXIDES
GRAIN BOUNDARIES
GERMANIUM
DIFFUSION
SILICON
SPINELS
RESEARCH PROGRAMS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELEMENTS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
METALS
MICROSTRUCTURE
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SEMIMETALS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360602 - Other Materials- Structure & Phase Studies