XRD and HRTEM characterization of pyrophyllite from Morocco and its possible applications

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• 作者：Bentayeb ; A. ; Amouric ; M. ; Olives ; J. ; Dekayir ; A. ; Nadiri ; A.
• 关键词：Pyrophyllite ; Morocco ; Triclinic ; Mica-like ; Fibre-glass
• 刊名：Applied Clay Science
• 出版年：2003
• 期刊代码：5_01691317
• 类别：ms
• 出版时间：April, 2003
• 卷：22
• 期：5
• 页码：211-221
• 文件大小：616 K

摘要

Samples of pyrophyllite material from a deposit in south Morocco were characterized in order to assess their possible applications. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) coupled with energy dispersive X-ray microanalysis (EDX) techniques have been used for qualitative and quantitative phase identification and for crystal symmetry determination of pyrophyllite. The raw material mainly consists of pyrophyllite, quartz and mica-like. Pyrophyllite and mica-like are homogeneous phases, with respective compositions Si₄(Al_1.92Mg_0.12)O₁₀(OH)₂ and K_0.85(Si_3.25Al_0.75)(Al_1.9Mg_0.1)O₁₀(OH)₂. They show a good crystallinity, a lack of structural defects and occur as stable polytypes, namely, 1T_c for pyrophyllite and 2M₁ for mica-like. Analytical results revealed the potential use of this pyrophyllite-rich material, particularly to produce fibre-glass.