In this article we will discuss about:- 1. Meaning of Diffusion 2. Importance of Diffusion 3. Applications 4. Types 5. Mechanisms 6. Activation Energy 7. Self-Diffusion 8. Diffusion in Oxides and Ionic Crystals 9. Grain Boundary and Surface Diffusion 10. Factors that Influence Diffusion. Contents: Meaning of Diffusion Importance of Diffusion Applications of Diffusion Types of Diffusion Diffusion Mechanisms Activation [...]
Fick proposed laws governing the diffusion of atoms and molecules, which can be applied to the diffusion processes in metals and alloys. He proposed two laws, the first for steady-state condition and unidirectional flow of atoms and the second law which deals with time dependence of concentration gradient; and the flow of atoms in all directions. Fick's First Law: Pick's [...]
The atoms and molecules in a solid state are more closely packed as compared to gaseous and liquid states and are held together by strong mutual forces of attraction. These interatomic forces are electrostatic in nature and depend upon the electronic structure of matter. When atoms come closer and finally unite to form molecules their electrons rearrange themselves in such [...]