Diffraction effects and images from inclined grain boundaries in polycrystalline thin foils

Electron diffraction study of the faceting of tilt grain boundaries in NiO

“…The relrod dimension along the direction of periodicity is inversely related to the product of the number of dislocations and their spacing. Observations on boundaries in metals (Carter, Donald andSass 1979, Hagege, Carter, Cosandey and and ceramics (Carter, Kohlstedt and Sass 1980) have confirmed that the diffraction effects shown in fig. 1 (b) are observed from planar tilt boundaries.…”

Approche géométrique des joints de grains. Intérêt et limite

“…incliné du type Plane Matching, des effets dus à l'arrangement périodique des dislocations ont pu être détectés dans les clichés de diffraction sans ambiguïté, mais, réciproquement, la visualisation de ces dislocations grâce au contraste d'interférence reste problématique [124].…”

The characterization of periodic dislocation arrays from the fine structure of electron diffraction patterns

“…The geometry of electron diffraction patterns associated with planar periodic structures in grain boundaries has been discussed in detail (Clarebrough & Forwood, 1980;Carter et al, 1979). In the present case of dislocation multipoles the rows of fine structure spots result from the intersection of the Ewald sphere by a set of rods in reciprocal space which are normal to the relevant slip plane and spaced along the periodic direction of the multipole, i.e.…”

“…Periodic structure in grain boundaries has been shown by several groups of workers to give rise to fine structure in electron diffraction and X-ray diffraction patterns of such boundaries (Spyridelis et al, 1967;Balluffi et al, 1972;Sass & Balluffi, 1976;Forwood & Clarebrough, 1977;Carter et al, 1979;Gaudig & Sass, 1979;Clarebrough & Forwood, 1980). For various specific cases the diffraction fine structure has been interpreted as evidence for : (a) the coincidence site lattice (CSL) formed by the two grains (Sass & Balluffi, 1976); (b) the spacings and directions of the intrinsic grain boundary dislocation (G.B.D.)…”