I have made some black powder sample, which is confirmed by PXRD to be a mixture of rutile TiO2 and a-Mn2O3 . There is possibly also some Mn-doped TiO2 inside, as the XRD peaks for TiO2 shift a bit.
Now I would like to know the optical properties of the Mn-doped TiO2, but it seems to be completely masked by the black a-Mn2O3 impurties.
So is there any method that I can isolate and study Mn-doped TiO2 alone? Is it possible that I can dissolve the mixture in some solution with properly tuned pH which can specifically remove Mn2O3 and leave TiO2 intact?
Thanks a lot.
I would try to dissolve Mn2O3 carefully in the acidic solution of the Mohr's salt (the procedure similar to what is used for the determination of the mean oxidation state of the transition metals by titration). But it will probably require very accurate tuning of the experimental conditions in order to avoid reduction of the Mn+4 in TiO2.
Anyway, it is unlikely that you will be able to dissolve Mn2O3 simply by tuning of pH. Mn3+ easily disproportionates to Mn2+ and MnO2 in the water solutions and selective removal of the solid MnO2 will be much more complicated.
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