Mechanisms Where the Cation Changes Its

- Diffusion Mechanisms Where the Cation Changes its Valence State 

Before we leave the subject of heterogeneous solid state diffusion and nucleation during a solid state reaction, let us examine the case where a change of valence state of one of the reactants occurs. In formal studies of 

This would give us the following diffusion diagram  

This would give us the case where a trivalent cation is present in a divalent lattice, (see Chapter 2). The operative defect reaction would be  

This situation gives rise to a complieated set of diffusion eonditions  

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