Synthesis of Ni-rich 1:1 phyllosilicates
Bentabol, Maria (Universidad de Málaga. Departamento de Química Inorgánica, Cristalografía y Mineralogía)
Ruiz Cruz, Maria Dolores (Universidad de Málaga. Departamento de Química Inorgánica, Cristalografía y Mineralogía)
Huertas, Francisco Javier (Estación Experimental del Zaidín)

Data:	2007
Resum:	Rapid dissolution of partly amorphized kaolinite in the systems kaolinite + NiCl, kaolinite + Ni(OH), and kaolinite + NiCl + Ni(OH), at a temperature of 200°C and at pH between 5. 3 and 7. 4, leads to the precipitation of Ni-poor kaolinite, Ni-rich kaolinite and Al-Ni-serpentine. Identification of the phases was carried out using a combination of X-ray diffraction and transmission/analytical electron microscopy. Ni-bearing kaolinite shows variable morphologies in thed systems studied: stacks of kaolinite with relatively small Ni contents and fine-grained curved particles of Ni-rich kaolinite dominate in the Cl-bearing system; spherical particles with a disordered structure and relatively uniform Ni contents (in the order of 0. 15 atoms per formula unit (a. p. f. u. )) and platy particles of Al-Ni-serpentine characterize the products formed in the Ni(OH)-richest systems. The presence of Ni(OH) in the systems (with and without Cl) favors the dissolution process as well as rapid precipitation of spherical particles, and the formation of serpentine. A difference from Mg systems studied previously is a well defined phase intermediate in composition between kaolinite and serpentine which originated in the Ni-bearing systems. Increasing Ni content is clearly reflected in the parallel increase in the b cell parameter of kaolinite. The average composition of the coexisting Al-Ni-serpentine is: (Al TiFeNi) (SiAl)O(OH,Cl).
Ajuts:	Ministerio de Educación y Ciencia CGL2006-02481
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Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Al-Ni-serpentine ; FTIR ; Hydrothermal Synthesis ; Ni-kaolinite ; TEM/AEM ; XRD
Publicat a:	Clays and Clay Minerals, Vol. 55, Núm. 6 (2007) , p. 572-582, ISSN 1552-8367

DOI: 10.1346/CCMN.2007.0550604

11 p, 1.1 MB  Accés restringit a la UAB

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