Structural and Morphological Characterization of the PP-0559 Kaolinite from the Brazilian Amazon Region
Structural and Morphological Characterization of the PP-0559 Kaolinite from the Brazilian Amazon Region
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DOI：
10.1590/s0103-50532002000200021
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发表时间：
2002
影响因子：
1.4
通讯作者：
K. C. Lombardi;José L. Guimarãesa;Antonio S. Mangricha;Ney Mattosob;Miguel Abbateb;W. Schreiner;F. Wypych
中科院分区：
文献类型：
--
作者：
K. C. Lombardi;José L. Guimarãesa;Antonio S. Mangricha;Ney Mattosob;Miguel Abbateb;W. Schreiner;F. Wypych
我们报告的天然高岭石PP-0559，从巴西亚马逊地区的结构和形态特征，目的是有助于了解这种粘土矿物在环境中的氧化还原反应。通过透射电子显微镜和电子衍射研究证实了三斜结构。它具有定向晶体，直径在0.2和2 mm之间，厚度约为50 nm。用电子顺磁共振研究了取向后各向异性晶体随外加磁场的变化。研究了替位Fe+3杂质和辐射感生顺磁中心的EPR主吸收线，认为它们可能是高岭石的氧化中心。
We report a structural and morphological characterization of the natural kaolinite PP-0559, from the Brazilian Amazon region, with the aim to contribute to the understanding of this clay mineral in environmental redox reactions. The triclinic structure was confirmed by transmission electron microscopy and electron diffraction studies. It exhibits oriented crystals, with diameters between 0.2 and 2 mm and about 50 nm of thickness. The anisotropic crystals after orientation were studied by electron paramagnetic resonance as a function of the applied magnetic field. The main EPR absorption lines of the substitutional Fe+3 impurity and radiation induced paramagnetic centers were studied as possible oxidizing centers of kaolinite.