By M.L Jenkins

This publication goals to explain intimately the electron microscopy tools used to enquire complicated and fine-scale microstructures, akin to these produced through fast-particle irradiation of metals or ion-implantation of semiconductors. specific realization is given to the tools used to signify small point-defect clusters akin to dislocation loops, because the insurance of this subject typically microscopy textbooks is proscribed and omits a few of the difficulties linked to the research of those defects. In-situ, high-resolution and analytical recommendations also are defined. The concepts are illustrated with examples, which serve to provide an summary of the contribution of TEM to the current knowing of radiation harm mechanisms. The e-book could be most respected to researchers in, or stepping into, the sphere of illness research in fabrics.

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Extra info for Characterisation of Radiation Damage by Transmission Electron Microscopy

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5(a) at R at a constant distance the bottom left shows schematically the displacements R from an edge-on interstitial loop in a plane intersecting the loop. 5(b)– (d), these displacements are resolved in the direction of three possible diffraction vectors g , that is the plots show r (θ ) = g · R (θ ). If g · R (θ ) is positive a full line is plotted, if negative a broken line is given. Above the line diagrams are simulated loop images corresponding to these diffraction geometries. The correspondence between the plots of the displacement field and the simulated images is striking.

25ξ110 g = 211, 2 in all cases. 75ξ110 . 36ξ110 . Scale mark 10 nm. From Eyre et al (1977b). 11. Simulated images of a pure edge [111] with sg = 0 in (a) an isotropic fcc solid, (b) copper, (c) nickel and (d) niobium. In copper and nickel the black–white contrast is considerably elongated, and l is aligned parallel to b . In niobium the black–white vector l lies midway between g and b . From Ohr (1979). this direction is elastically hard, and thus the black–white vector is rotated further ¯ Burgers vector than for an elastically isotropic material.

For quantitative image-contrast measurements an energy filter, aligned to permit only elastically scattered electrons to form the image, is a distinct advantage. 5 nm) will be achievable, and useful defect imaging in thicker foils will be possible. The use of an integrated post-filter CCD camera will provide the necessary digital recording and linear low-dose data required for quantitative analysis. 11. Caution required! Under some imaging conditions surface oxide can be confused with radiation damage.

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