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Cation segregation in Nb 16 W 18 O 94 using high angle annular dark field scanning transmission electron microscopy and image processing
Author(s) -
Kirkland A. I.,
Saxton W. O.
Publication year - 2002
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1046/j.1365-2818.2002.01002.x
Subject(s) - dark field microscopy , scanning transmission electron microscopy , transmission electron microscopy , complex oxide , scanning electron microscope , field (mathematics) , characterization (materials science) , materials science , optics , image processing , electron , image (mathematics) , oxide , microscopy , physics , computer science , artificial intelligence , mathematics , pure mathematics , metallurgy , quantum mechanics
Summary We report the characterization of the complex oxide Nb 16 W 18 O 94 using high angle annular dark field imaging at 200 kV in a scanning transmission electron microscope. The results of this study suggest that the W and Nb cations are not uniformly distributed among the cation columns projected along [001] but that there is preferential segregation of the heavier species to certain column sites. In order to analyse the experimental data obtained, an image processing methodology has been developed which may also find application in locating specific motifs within a generally distorted image field.