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Subgrain Boundaries in MgO
Author(s) -
NARAYAN J.
Publication year - 1973
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.1151-2916.1973.tb12443.x
Subject(s) - dislocation , tilt (camera) , transmission electron microscopy , boundary (topology) , crystallography , grain boundary , materials science , impurity , condensed matter physics , geometry , physics , chemistry , mathematics , microstructure , mathematical analysis , nanotechnology , quantum mechanics
The structure of subgrain boundaries in as‐grown MgO was characterized by transmission electron microscopy. The types of subboundaries which occur quite frequently are (1) a pure tilt boundary consisting only of ½ [101]‐type dislocations ( A set); (2) a tilt boundary consisting mainly of ½ [101] ( A set) and ½ [011] ( B set) dislocations; and (3) a mixed boundary with ½ [101] ( A set), ½ [011] ( B set), and ½ [01] ( C set) dislocations. At the nodes the following dislocation reactions occur: ½ [011]+½ [10] =½ [110] and ½ [10]+½ [101] = [100]. The precipitation of impurities at the subboundaries and their role in pinning the subboundaries are discussed.