Theoretical and experimental descriptions of grain boundaries in rhombohedral α-Al2O3
- 1 March 1990
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 61 (3) , 493-509
- https://doi.org/10.1080/01418619008231929
Abstract
Tables are given of all coincidence orientations with multiplicity Σ ≤ 36 for rhombohedral lattices with axial ratios in the range of corundum type structures (2.696 < c/a < 2-765). Measurements of the relative orientation of 133 pairs of neighbouring grains in sintered a-alumina showed that near-coincidence boundaries (14 cases) and one-dimensional coincidence boundaries (17 cases) occurred more frequently than would be the case for randomly distributed orientations and that many of these special boundaries contained periodic arrays of grain boundary dislocations. Their Burgers vectors have been determined for a rhombohedral twin boundary in order to decide which one among three possible coincidence descriptions best represents the boundary structure.Keywords
This publication has 15 references indexed in Scilit:
- Large-angle grain-boundary structures in hexagonal close-packed metalsPhilosophical Magazine A, 1988
- Coincidence‐Site Lattices in the Rhombohedral SystemCrystal Research and Technology, 1986
- Stability of extrinsic grain boundary dislocations in relation with intergranular segregation and precipitationActa Metallurgica, 1983
- A unique description of the relative orientation of neighbouring grainsActa Crystallographica Section A, 1980
- Twinning dislocations in haematite iron orePhilosophical Magazine A, 1979
- Computation of coincident and near-coincident cells for any two lattices – related DSC-1 and DSC-2 latticesActa Crystallographica Section A, 1977
- Study of intercrystalline boundaries in terms of the coincidence lattice conceptPhilosophical Magazine, 1975
- Identification of grain boundary dislocationsPhilosophical Magazine, 1975
- The structure of high-angle grain boundariesActa Metallurgica, 1966
- On Miller–Bravais indices and four-dimensional vectorsActa Crystallographica, 1965