STRUCTURAL CHANGE OF ALLOPHANE BY DRY GRINDING AND ITS INFLUENCE TO THE ALLOPHANE-MULLITE THERMAL SEQUENCE
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概要
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Mechanochemical structure change of allophane by dry grinding and their effects on the allophane-mullite thermal reaction have been examined by powder X-ray diffraction (XRD), differential thermal analysis (DTA), infrared absorption (IR) spectra, transmission electron microscopy (TEM) and X-ray radial distribution function analysis (RDF). RDF analysis revealed that dry grinding caused change of a part of Al coordination number from six to four and also caused the configuration of polyhedra more random state. Breakdown of the Si-O-Al linkage was deduced from the shift of the IR absorption band around 900-1100 cm^<-1>. Almost simultaneous formations of spinel phase and mullite were observed when untreated allophane was fired at around 1000℃, whereas formation temperature of spinel phase was lowered by about 30℃ and that of mullite was raised by about 100℃ by dry grinding. These changes may be due to the breakdown of the Si-O-Al linkage and segregation into condensed Al_2O_3 and SiO_2 configurations.
- 日本粘土学会の論文
著者
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Okada Kiyoshi
Department Of Metallurgy & Ceramic Science Tokyo Institute Of Technology
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Ossaka Joyo
Department Of Geosciences Okayama University
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OTSUKA NOZOMU
Department of Inorganic Materials, Tokyo Institute of Technology
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Otsuka Nozomu
Department Of Inorganic Materials Tokyo Institute Of Technology
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Okada Kiyoshi
Department Of Electronic Control Engineering Nagaoka National College Of Technology
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