For a good quantitative phase analysis you need to run a Rietveld refinement of your diffraction pattern.
Provide full information: What is the wave length, the diffractometer type, sample preparation etc etc. Without wave length, a 2Theta scale is completely meaningless. What is the "amorphous" background in the 2Theta range 20 to 45 due to, what is the strange background below 15 degrees??
Are you sure your phase assignments are correct?
With Cu2O in Pn-3m and CuO in C2/c, CuO does not have a strong reflection at roughly 44°2Theta@CuKalpha, see calculated diffraction pattern
Cu2O Pn-3m a= 4.252 Ang
CuO C2/c ; a=4.65300 b=3.41000 c= 5.10800 , beta = 80.52
What is FTO ?
Your "Pure Cu2O" does not seem to be Cu2O only ????
In fact the patterns are the same...so we can expect that the same phases are present. CuO has its main peaks between 30 and 40° (with Cu wavelenght) so your peaks attribution is suspect. The Rietveld refinement is a good method to determine the crystalline phases, and, with proper softwares and the addition of standard, also the amorphous content.
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