ナフテン酸鉄の熱分解による各種酸化鉄薄膜の作成とその生成過程

抄録

The iron naphthenate coated on a glass substrate thermally decomposed to Fe₃O₄, γ-Fe₂O₃ and α-Fe₂O₃ films by the calcination at a temperature range from 200 to 800°C. These iron oxide films were examined by X-ray diffractometry, colorimetric analysis and electron microscopy.
The details of the change of iron oxides prepared on the films were as follows:
1) The solid solution of Fe₃O₄-γ-Fe₂O₃ system crystallized at the temperature range from 250 to 400°C. The lattice constant of the solid solution continuously decreased and the degree of oxidation increased as the calcination temperature rose up to 400°C.
2) The pure γ-Fe₂O₃(a₀=8.338Å) crystallized at the temperature range from 450 to 500°C for 4h. This γ-Fe₂O₃ was stable on calcining over long time at this temperature range.
3) The γ-Fe₂O₃ transformed to α-Fe₂O₃ above 500°C with the increase in the grain size. The amount of α-Fe₂O₃ increased with a rise in the calcination temperature and time.
4) The color of the film obtained below 500°C was yellowish brown. The color changed to brownish red above 550°C, because the γ-Fe₂O₃ transformed to α-Fe₂O₃.
5) The thickness of the film prepared above 400°C ranged between 2000-2500Å.