The papers in this section represent four different aspects of the theory of point defects and dislocations in crystalline solids: (i) static or, more accurately, thermodynamic properties of point defects (Lidiard and Norgett and Builough) (ii) dynamic and optical properties of point defects (Balkanski) (iii) properties of the dislocation core (Bullough) and (iv) dislocation properties dependent on their long-range elastic strain fields (Lothe). These papers are representative of important aspects of the theory of the defect solid state. An apparent asymmetry in the coverage of topics provided by the four papers comes about (a) because point defects in contrast to dislocations, are all ‘core’ in the sense that their most important properties are determined by what happens in the immediate vicinity of the defect where continuum elasticity theory cannot be used, and (b) because the study of localised and perturbed electronic and vibrational states in the vicinity of dislocation cores has proved more difficult than the corresponding studies for point defects, although some studies of the perturbation by dislocations of localised or more accurately resonant modes due to point defects show promise (Busse and Haider1). The most obvious gaps in the coverage offered by these are two. The first is the absence of a detailed discussion of the theory of localised electronic states, e.g. colour centres, where a variety of approaches are in use; some of these are very analogous to those used in molecular theory.
KeywordsPoint Defect Vibrational State Dislocation Core Introductory Remark Localise Vibrational Mode
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