How can one determine oxygen non-stoichiometry for ABO3 perovskites using XPS? Take for example, Ba0.5Sr0.5Co0.8Fe0.2O3-d. I will be glad if anyone could clearly and succinctly explain it. Thank you very much.
You shall compare with the standard O1s spectra. If there is a shift in the values, means there is an oxygen non-stoichiometry. If you do the calculations properly, you shall do the areal comparison of the O1s spectra to quantify the oxygen deficiency percentage.