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Figure 1
Double positioning grain boundary in fcc thin film: overlapping of the two twinned crystals along the electron direction 〈111〉. (a) Schematic representation (from Dickson & Pashley, 1962BB21). Pashley & Stowell (1963BB46) used this representation and other arguments based on complex double diffraction between non-excited spots to explain the extra spots at 1/3{422} in the 〈111〉 EDPs. (b) We propose another schematic representation of the double positioning grain boundary. Nano-interpenetrating steps at the interface act as planar defects on the {111} planes and induce streaks along the reciprocal vector g(111). The streaks intersect the Ewald sphere and create the extra spots at 1/3{422} (details in §§3.1[link] and 5.2[link]).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 42| Part 2| January 2009| Pages 242-252
doi:10.1107/S0021889808042131
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