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High‐Resolution Transmission Electron Microscopy Studies of a Near Σ11 Grain Boundary in α‐Alumina
Author(s) -
Höche Thomas,
Kenway Philip R.,
Kleebe HansJoachim,
Rühle Manfred,
Morris Patricia A.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb07001.x
Subject(s) - high resolution transmission electron microscopy , grain boundary , transmission electron microscopy , materials science , crystallography , resolution (logic) , condensed matter physics , lattice (music) , molecular physics , electron microscope , optics , chemistry , microstructure , nanotechnology , physics , composite material , artificial intelligence , computer science , acoustics
The atomistic structure of a near Σ11 (N211) grain boundary in ultrapure α‐AI 2 O 3 bicrystals was determined by quantitative high‐resolution transmission electron microscopy (HRTEM). High‐resolution imaging revealed an atomically sharp interface with a characteristic periodic pattern at (0 1 11) ‖ (01 1 1) facets. The pattern was analyzed by comparing the HRTEM micrographs with simulated images of different structures that had been relaxed by static‐lattice calculations. The best agreement with experiment was reached for the grain boundary structure with the lowest energy (1.7 J·m −2 ). Although this structure reproduces the relative translation state of the adjacent crystals to within 0.02 nm, the calculated structure was not in complete agreement with the periodic pattern at the grain boundary. The origin of this difference is probably due to a slight misalignment of the two crystals adjacent to the boundary.