5 Flashcards
1
Q
Inter diffusion
A
Diffusion from one material into another
2
Q
Self diffusion
A
Atomic migration in pure metal
3
Q
Vacancy difusion
A
If there is empty adjacent site AND energy to break bond
Atoms and vacancies change position (self)
If host and sub impurity atoms (inter diff)
4
Q
Interstitial diffusion
A
Rapid, lower energy bonds to break
5
Q
Ficks first law
A
When diffusion flux is independant on time,
Flux is proportional to concentration
6
Q
Ficks second law
A
Non stewdy state diffusion
Concentration dependant on rime and position
7
Q
Factors that influence diffusion
A
Diffusing species
Temperature
8
Q
N type semiconductor
A
1 extra valence electron (doped)
9
Q
P type semi conductor
A
1 less valence electron (doped)
