I am wondering about the procedure to come up with the number here for the anion correction for formation energy of compounds with O2. I have seen Wang et al. (doi:10.1103/PhysRevB.73.195107), but the value is slightly different than suggested. I have also seen Jain et al. (doi:10.1103/PhysRevB.84.045115), but don’t see any specific suggestion for the anion correction that matches what is being used in Materials Project.
The code claims it is “Oxide Corrections fit to Li2O, Na2O, K2O, Rb2O, MgO, CaO, SrO, BaO, Al2O3 on 09/18,” and I’m wondering what exactly the procedure to obtain that number was.