Test 3 Review

Test 3 Review - Exam 3 Review 1) Nucleation a) Homogeneous...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Exam 3 Review 1) Nucleation a) Homogeneous i) Top curve retarding force – surface energy liquid solid ii) Bottom curve – driving force – volume free energy dGv iii) Middle curve – resultant - b) Heterogeneous nucleation c) Know Graphs 2) Arrhenius Reaction Rate = Ce -Q/RT i) C – constant ii) Q – activation Energy iii) R – molar gas const. iv) Temp (K) v) Ln(ratre) = lnC – Q/R * 1/T vi) Y = b + mx 3) Diffusion a) Vacancy mechanism i) Ex: dopant atoms in silicon (1) They replace certain silicon atoms in the lattice (2) Vacancy mechanish – not very many vacancies, moving around is slower b) Interstitial mechanism is much faster because the atoms are small enough to move in the interstitial sites in the lattice. 4) Ficks 1 st law a) J = D* dC / dX b) J flux – atoms/s.m 2 /s c) D – Diffusivity – m 2 d) dC / dX – concentration gradient – atoms/m 3 /m e) lower free energy by increasing entropy – making it less random 5) Ficks 2 nd law a)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This test prep was uploaded on 04/07/2008 for the course MSE 150 taught by Professor Wittig during the Spring '07 term at Vanderbilt.

Page1 / 2

Test 3 Review - Exam 3 Review 1) Nucleation a) Homogeneous...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online