| |
|
· In a three-dimensional lattice,
six equivalent <100> jumps will take the interstitial from one body centered
site to the equivalent site in an adjacent unit cell.
· Only a jump in the [100] direction will contribute to transport
in the +x direction.
· The
interstitial
can overcome the Gibbs function barrier to the [1 0 0 ] jump
,ΔG, if it has a thermal vibration energy
greater than this value.
· The
Boltzmann probability of the atom having an energy of ΔG is:
P = exp(- ΔG/kT) ,
where T is the Kelvin
temperature of the lattice.
· The
number of approaches to the barrier in unit time is determined by the lattice
vibration frequency (Einstein frequency) n ~ 1015
Hz
|
|
|
