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Structural study of Cd(S,Se) doped glasses. High‐resolution transmission electron microscopy (HRTEM) assisted by image processing
Author(s) -
Allais M.,
Gandais M.
Publication year - 1990
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889890006379
Subject(s) - high resolution transmission electron microscopy , crystallite , materials science , nanocrystal , transmission electron microscopy , grain size , optics , resolution (logic) , crystallography , analytical chemistry (journal) , nanotechnology , chemistry , physics , chromatography , artificial intelligence , computer science , metallurgy
High‐resolution transmission electron microscopy (HRTEM) was used for examining Cd(S,Se) nanocrystals grown in silicate glasses commercially available as optical filters. The lattice images of the nanocrystals were numerated and submitted to filtering through Fourier transformation in order to sweep off the background signal originating mainly from glass. Optical filters from several firms were examined. The nanocrystals have been identified with Cd(S,Se) compounds crystallized in the wurzite structure, as in bulk material. The lattice images indicate crystallites having the shape of hexagonal prisms a little elongated along the c axis. The distribution of grain size differs according to the filter: the smallest size being about 1.5 nm (threshold for detection), the largest size varies from 7 to 10 nm, the average size s a , from 3–4 to 5–6 nm and the characteristic size s c from 5–6 to 7–8 nm ( s c is the size of grains occupying the main part of the crystallized volume).