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MCE Hanshan 1 - Coggle Diagram
MCE Hanshan 1
Surface
High energy surfaces
Cutting crystal along high index plane
Exposing 2nd or 3rd layer atoms
Stepped surfaces
Minimising energy
Relaxation: change position of entire layers leading to smaller interlayer spacing
Reconstruction: change in 2D structure, reorganise bonding
Adsorption
Hertz-Knudsen Eqn: sticking of gas molecules on a surface
Physisorption
= van der wals forces
Weak, low absorption heat, low activation energy, reversible, fast and negative temp
Chemisorption
= chemical bonds
Strong, high absorption heat, high activation energy, irreversible and positive temp
Carburisation
Carbon is adsorpted into surface
