“…E g s found in earlier studies, varying from 2.3 to below 1.9 eV as previously noted, lie between the values 2.31 and 1.56 eV, given previously, which as shown above are inaccurate. The strong differences met in the literature for E a , e.g., 2.1 eV 41,42 or 0.735 eV 27 and for E g varying as above or 3.36 eV 46 are thus justified by Eq. 13, the The C UIP must become maximum at a T, which can be considered Ϸ T M , between 260 and 294 K, i.e., around 278 K, which is close to the 265 K in the literature for bulk hematite.…”