Atomic diffusion refers to the process where the random thermal agitation of atoms in a solid results in the net transport of atoms. An example would be helium gas escaping from a balloon, which causes it to deflate.
(a) Compare interstitial and vacancy atomic mechanisms for diffusion. (b) Cite two reasons why interstitial diffusion is normally more rapid than vacancy diffusion. Solution (a) With vacancy diffusion, atomic motion is from one lattice site to an adjacent vacancy. Self-diffusion and the diffusion of substitutional impurities proceed via this mechanism. On the other hand, atomic motion is from interstitial site to adjacent interstitial site for the interstitial diffusion mechanism. (b) Interstitial diffusion is normally more rapid than vacancy diffusion because: (1) interstitial atoms, being smaller, are more mobile; and (2) the probability of an empty adjacent interstitial site is greater than for a vacancy adjacent to a host (or substitutional impurity) atom.
diffusion happen because of the motion of the gas particle which they are travelling faster than the particles in solid and liquid and the different atomic mass of the gases
Diffusion.
Net diffusion means the total diffusion due to both holes & electrons .
Facilitated diffusion uses integrated proteins that act as channels for ions or molecules to pass through.
(a) Compare interstitial and vacancy atomic mechanisms for diffusion. (b) Cite two reasons why interstitial diffusion is normally more rapid than vacancy diffusion. Solution (a) With vacancy diffusion, atomic motion is from one lattice site to an adjacent vacancy. Self-diffusion and the diffusion of substitutional impurities proceed via this mechanism. On the other hand, atomic motion is from interstitial site to adjacent interstitial site for the interstitial diffusion mechanism. (b) Interstitial diffusion is normally more rapid than vacancy diffusion because: (1) interstitial atoms, being smaller, are more mobile; and (2) the probability of an empty adjacent interstitial site is greater than for a vacancy adjacent to a host (or substitutional impurity) atom.
There are three forms of passive transport, or the movement of biochemical and other atomic or molecular substances across the cell membranes. They are: osmosis, simple diffusion or facilitated diffusion, and filtration.
Qiongshan Zhang has written: 'Fundamental studies of atomic diffusion by computer simulation of atomic processes on the giga event scale and multiple PC's in parallel' -- subject(s): Diffusion, Computer simulation
diffusion happen because of the motion of the gas particle which they are travelling faster than the particles in solid and liquid and the different atomic mass of the gases
Brian Tuck has written: 'Physical electronics' -- subject(s): Electronics 'Atomic diffusion in III-V semiconductors' -- subject(s): Diffusion, Semiconductors
Passive transport is when molecules pass freely through the membrane moving from the higher concentration area to the region of lower concentration. Three examples of this are diffusion, osmosis, and active transport.
The Atomic or Molecular movements generally known as Osmotic diffusion.
contagious diffusion, relocation diffusion, expansion diffusion, stimulus diffusion, hierarchical diffusion.
diffusion
Diffusion occurs via random atomic [and molecular] collisions. The Kinetic Energy that is needed to accomplish this is derived exclusively from Heat. No Heat, or even Warmth, yields no Diffusion.
Sintering is a method for creating objects from powders. It is based on atomic diffusion. Powder is heated to near it's melting point in a mold and then allowed to reform.
I think it would be a point defect because a vacancy in the lattice structure would allow another atom to take the place of the vacancy.