KBr錠剤法によるα,γ-FeOOHの異常赤外吸収スペクトル

概要

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Some factors which affects the absorption band at near 3400cm -1 in the infrared spectra of α and γ-FeOOH have been investigated. The potassium bromide pressed disks for the measuring were prepared by the mixing of the samples and potassium bromide powder using the agate mortar. The results were as follows: The infrared spectra of a and γ-FeOOH were observed as a medium absorption band at near 3400cm -1 The intensity of this absorption band decreased with aging time. After 24 hours, this becomes a shoulder like form and is very weak. From these facts, it was supposed that the near 3400cm -1 band is due to the O-H stret-ching of the non stoichiometric water formed by the grinding in the amorphous hydrated ferric oxide. On the other hand, the change of the intensity with time were seemed to being due the recrystallization into α or γ-FeOOH from the amorphous hydrated ferric oxide.
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