Electron microscopy
  
Misfit Strain
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM Book                                                                                   https://www.globalsino.com/EM/        

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
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When a film is deposited on a substrate, the misfit strain between the film and substrate can be given by,
          Misfit Strain ------------------------- [3344]
where,
          dsub -- The in-plane lattice parameter of the substrate.
          dfilm -- The in-plane lattice parameter of the film.

When the thickness of the film is increased, strain energy will build up. Therefore, the system needs to relax the accumulated strain. At a critical thickness, the relaxation process starts.
          

 

 
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