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- W3035856834 abstract "Dislocations were imaged using the high-angle hollow-cone dark-field transmission electron microscopy (HADF-TEM) technique. Experiments were performed using a Philips CM30 TEM at 300 kV Dislocations and grain boundaries show bright contrast in HADF-TEM images and there are no contrast reversals with thickness or defocus. The dislocation contrast shows no dramatic variation when the average semi-conical angle θ was increased from 40 to 110 mrad, but does show strong dependence on the diffracting conditions that are set up for the corresponding on-axis bright-field (BF) TEM image (Fig. 1). Under the one-beam (random orientation without strong diffraction) reflection condition (Figs, 1a and 1a'), the visibility of the dislocations is poor in either the BF-TEM or the HADF-TEM image. Under the two-beam diffracting condition (Figs, 1b and 1b') both BF-TEM and HADF-TEM images show optimized contrast. The features appearing in the HADF-TEM images have a good one-to-one correspondence with the features shown in the corresponding BF-TEM images; the dislocation contrast disappears in the HADF-TEM images if the condition g·b = 0 is satisfied in the BF-TEM images, where b is the Burgers vector (Fig 2)." @default.
- W3035856834 created "2020-06-25" @default.
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- W3035856834 date "1993-08-01" @default.
- W3035856834 modified "2023-09-27" @default.
- W3035856834 title "Dislocation contrast in high-angle hollow-cone dark-field TEM" @default.
- W3035856834 cites W2086191186 @default.
- W3035856834 doi "https://doi.org/10.1017/s0424820100149301" @default.
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