The ratio beteen Ti3+/Ti4+ they have calculated in paper 14% by the peak area and than they calculated concentration of Oxygen vacancy 3% I am not getting how they have done it. Please give your valuable suggestions.
Please find the attachment.
Could the calculation run like this?:
Lets assume we have 114 Ti atoms, in perfect TiO2 this would mean 228 oxygens. Now 14 of the Ti are in Ti3+, meaning they only supply 21 oxygens instead of 28.
Total number of oxygens thus 221 in H-P25, compared to 228 of TiO2 means 3% oxygen missing.
Or in other words:
O/Ti = 2 in TiO2
O/Ti = 2*0.877*Ti4++3/2*0.123*Ti4+ (these are the 14% Ti3+) = 1.9385 in H-P25
H-P25/TiO2 = 1.9385/2 = 0.97 = 3% oxygen missing
Ti4+ comes from TiO2
Ti3+ comes from something like Ti2O3, meaning two Ti3+ equal one oxygen vacancy.
It is even written in the paper attached above.
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