I doped Sn-Sb alloy with Ti,Cu and Ce elements individually (@ 25 wt % as replacement to Sn). From EDX calculation, the elemental compositions are Sn1.38Sb3.60, Sn0.85Ti0.37Sb3.86, Sn1.27Cu0.68Sb3.30 and Sn0.80Ce0.48Sb4.19. I am wondering why do these alloys exist in different compositions for different dopants. The dopant occupation is very random and I couldn't understand any defined replacement here. Why do they change (increases/decreases) compositions of Sn and Sb while Sb's weight % is not changed during synthesis process? Please clarify.
As far as I remember is one conditions the size of the atom/ion, and electron shell properties (like type of preferred bondings, ionicity and possibly some other things). Some phases have solution limits of certain elements (like Ni in Fe). If the concentration becomes higher, another phase is formed or stabilized. This is a quite complex problem since Fe in Ni is different to Ni in Fe. Moreover, the diffusion behaviour is different as well which is possibly not that important for you. Different compositions form differently stable phases (look phase diagram) which can occur simultaneously (for different chemical composition).
fo alloy preparatio, you should be for elementa percentage measuring. In your case percentag amount of elements should be according to the atomic wight with the molarity system calculations
If the impurity atoms have comparative size of the host atoms then replaces their position while in between atoms will be the position for smaller size impurity atoms
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