The Relation Between Some Properties of Halloysites and Their Sedimentary Ages

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  • OKADA Kiyoshi
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • OSSAKA Joyo
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology

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  • ハロイサイトの諸性質とたい積年数との関係
  • ハロイサイト ノ ショ セイシツ ト タイセキ ネンスウ ト ノ カンケイ

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Abstract

The relations between some properties and their sedimentary ages were examined for halloysites of weathering origin in Japan. Properties examined include content of halloysite in each specimen, stability of interlayer water, thermal behavior and ratio of infrared absorbance for bands at 3700 and 3620 cm-1 (A3700/A3620). Halloysite contents were measured by DTA method. Stabilities of interlayer water were estimated from the existence probability of halloysite 10Å phase after the specimen was exposed to relative humidity of 30%(W30H). For this estimation, the X-ray diffraction profiles was simulated with mixed-layer models. For the examination of the thermal properties of halloysites temperatures of endothermic peaks at around 100 and 500°C and exothermic peak at around 1000°C, and slope ratios (a/b) of the endothermic peak at around 500°C on DTA curves were applied. With increasing age of sedimentation, following correlations are recognized as a general trend.(1) Halloysite contents in the specimens increases.(2) Stability of interlayer waters of halloysites decreases.(3) The peak temperatures and slope ratios of DTA curves of halloysites approach to those of kaolinites of disordered type.(4) The values A3700/A3620 in infrared spectra of halloysites approach to those of kaolinites. It is concluded that Properties of halloysites change and approach to those of kaolinites with increasing age of sedimentation.

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