Transcription of CHAPTER 5 SOLID STATE DIFFUSION - Universitetet i oslo
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CHAPTER 5 SOLID STATE DIFFUSION - Universitetet i oslo
10:36. CHAPTER 5. SOLID STATE DIFFUSION . INTRODUCTION. Numerous chemical reactions or micro-structural changes in solids take place through SOLID STATE DIFFUSION , the movement and transport of atoms in SOLID phases. The DIFFUSION takes place because of the presence of defects in solids. Point defects, vacancies and interstitial ions, are responsible for lattice DIFFUSION . DIFFUSION also takes place along line and surface defects which include grain boundaries, dislocations, inner and outer surfaces, etc. As DIFFUSION along linear, planar and surface defects is generally faster than in the lattice, they are also termed high diffusivity or easy DIFFUSION paths. Another frequently used term is short circuit DIFFUSION . The relative contribution of the different types of DIFFUSION in oxides and other inorganic compounds are functions of the temperature, partial pressures or activities of the constituents of the compounds, the microstructure, grain size, porosity etc.
6 For this purpose let us consider a simplified one-dimensional model where particles jump between parallel planes separated by a distance s as illustrated in Fig.5.3.
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