On Glass-Slide Reflection Method for Infrared Absorption Spectra Measurement of Clay Minerals

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  • 粘土鉱物の赤外吸収スペクトル測定のためのスライドガラス反射法について
  • ネンド コウブツ ノ セキガイ キュウシュウ スペクトル ソクテイ ノ タメ

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Abstract

The glass-slide specimen used for the reflection measurement of an infrared absorption spectra is prepared as follows. A part of the suspension of a clay sample, deflocculated well and being free from coarser particles, is poured on the glass-slide, on which a gold coating is put together by firing, and then a clay film forms on the gold coating after drying.<BR>Using the glass-slide reflection method, the IR spectra of the full range from 4000cm-1 to 400cm-1 could be measured. The spectra of some kaolinite samples registered by the reflection method were investigated, comparing them with the one measured by the film transmittance method, where the clay film deposited on the IR transparent material is used. Next, the effect of the thickness of the clay film on the spectrum was illustrated for the reflection method. Further, the spectra of a number of kaolin samples measured by the reflection method were discussed, comparing them with the spectra found in the publication by H. W. van der Marel and H. Beutelspacher, which are measured by KBr method.<BR>The spectra of the OH region by the reflection method were very similar to that by the transmittance method. Concerning the spectra in the 1300-900 cm-1 region, at first, some differences in the wave number of absorption bands were found between both spectra. In the spectra of the 1050-1000 cm-1 region, where two important bands exist, the very remarkable difference was observed, that is, the two bands became opposite in strength as well as showed larger shift of the peaks.<BR>Though the infrared spectra of kaolin minerals measured by the reflecti on method showed some differences from that by the usual film method or KBr method, this reflec-tion method is found to be worth to be applied universally to the measurement of the infrared spectra of clay minerals.

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