Metal-oxide heterophase structures formed at low temperature activation of iron. 2. IR spectroscopyстатья
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Дата последнего поиска статьи во внешних источниках: 3 декабря 2017 г.
Аннотация:Low-temperature activation of iron is observed during its isothermal oxidation at a temperature of 300 degrees C and an oxygen pressure of 10(-2) Torr. A 1-h treatment prol vides the maximum gain in the oxide layer thickness for this oxygen pressure. According to IR spectroscopic data, the amount of Fe3O4 in the oxide reaches the maximum in the oxygen pressure interval from 10(-3) to 10(-2) Torr and decreases with a further increase in the oxygen pressure. In contrast, the haematite content increases with an increase in the oxygen pressure. In the latter case, first, the content of the alpha-Fe2O3 phase increases to reach its maximum at pressures from 5 x 10(-3) to 10(-2) Torr, while the phase of haematite gamma-Fe2O3 appears at 0.1 Torr. This confirms the earlier assumption that the haematite islets layer plays the decisive riles in the low-temperature activation and the active-passive transition of iron.