I have a complex oxide BaTi8-xGaxO16. What standards I should run?

Ga is the dopant. I guess I should run the sample without dopant BaTi8O16 as standard, or the simple oxide as BaO, TiO2 Ga2O3?  or is the standard necessary?

Also, I have colleage working on DFT, I assume the theoretical standard is the result from the DFT calculation, and by using the coordinates of the atoms, I can run FEFF and fit the data.

Thanks

Yun