Diffusion in solid

소개글

solid 특히 금속 또는 합금 내에서의 diffusion에 대한 이해를 위한 자료

목차

1.Kinetics vs. Thermodynamics2.General review of Diffusion 2.1.Atomic diffusion 2.2.Driving force of diffusion 2.3.Diffusion equations 2.4.Kirkendall effect 2.5.Defects3.How to determine the interdiffusion  coefficient in real experiments 3.1.Darken’s equation 3.2.Experimental procedures 3.3.Matano Interface

본문내용

Thermodynamics: driving force
- tells whether or not a process or a reaction can occur
- applicable to systems in stable or metastable equilibrium
- sufficient driving force is needed to enforce a favorable transformation
Kinetics: activation energy
- how fast or slow a process can occur, i.e., determining the rate
- applicable to systems in transition from non-equilibrium to equilibrium,
or between two equilibrium state
- kinetics of process is generally about how to overcome the energy barrier
to finish the transformation from starting state to the final state

Kinetic theory
5
For a process to occur, it must overcome the energy maximum.
Kinetic theory:
The rate of reaction is proportional to the probability to reach activated state

Driving force vs. Activation energy
6
Driving force
A thermodynamically favorable reaction or process means ΔG < 0:
the products are at a lower free energy, or more stable, than the reactants.
Because of this, the reactants want to be converted into the products.

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