Non stoichiometry

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Hello, I'd like to understand better the relation between non-stoichiometry and partial occupancies. Let's suppose for example that after an Xray analysys I find that in a material a site can be occupied by an atom of type 1 or an atom of type 2 with 50 % probability. Does it usually mean that the material is non stoichiometric and that it is possible to produce a material with different stechiometric ratios or there is no relation?
 

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after an Xray analysys I find that in a material a site can be occupied by an atom of type 1 or an atom of type 2 with 50 % probability
Can you rephrase this? It's not making any sense to me in terms of stoichiometry. Are you talking about lattice defects when you say "sites?"
 

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