I have synthesized the (Bi4Ti3O12)x-(CaCu3Ti4O12)1-x  (where X=0, 0.2, 0.4, 0.6, 0.8, 1.0) composite powder by sol-gel method. Bi4Ti3O12 is belongs to the orthorhombic crustal structure with Fmmm space group while CaCu3Ti4O12 belongs to the cubic structure with Im3 space group. If X=0; only CaCu3Ti4O12 is appear and X=1; only Bi4Ti3O12 is appear. In both cases, I have easy to find out the prominent phase present in the composite due to their distinct single phase nature. But intermediate compositions (X=0.2, 0.4, 0.6, 0.8) contains both cubic (CaCU3Ti4O12) and orthorhombic phase (Bi4Ti3O12). In such cases, which one is prominent phase and how to fix this one?  If there is any relations are available to find out the constituent phase present in the composites by quantitatively.  Anybody suggest me.