The Slip, Twinning, Cohesion, Growth and Boundaries of Crystals

摘要: The nature and stability of intercrystalline boundaries are discussed conclusions as to preferred relative orientations illustrated by ball-bearing bubble-raft models. Electron-diffraction evidence from crystals layer-lattice, ionic, metallic van der Waals (organic molecular) types is presented, showing that crystal pairs symmetrical or unsymmetrical triplet multiplet groupings occur, having a common lattice row, but in azimuthal at intervals agreeing with the predictions. component were thus coherent metastable contact type discussed, some cases strong secondary elastic scattering showed extensively superposed on plane which was normal row. seven electron-diffraction pattern observed such groupings, specimen preparation, suggest origin these mechanical deformation during after growth, process `rotational slip' has not hitherto been explored defined nature. Such slip directly demonstrated macroscopically potassium ferrocyanide trihydrate gypsum, being produced planes parallel highly perfect cleavage. relation between rotational known translational dislocation theory indicated, particular `deformation bands' investigated especially Barrett his collaborators concluded be essentially bands initially low deformation, though modified higher deformation. A valuable new insight also provided into many observations growth properties, nature, determining conditions, disorientation growing epitaxially single substrates, caused unidirectional abrasion