Hydrothermal synthesis of Mg-rich and Mg-Ni-rich kaolinite
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 (CSIC. Estación Experimental del Zaidín)
Linares, Jose (CSIC. Estación Experimental del Zaidín)

Fecha:	2006
Resumen:	Mg-rich kaolinite and Mg+Ni-rich kaolinite have been synthesized in hydrothermal experiments (200 and 400°C) from poorly crystalline kaolinite and Mg- and Mg+Ni-bearing solutions. Al-rich serpentine and Al-rich chlorite were obtained as sub-products of the reactions. The formation of these phases occurred through a dissolution-precipitation mechanism that led to spherical kaolinite after short reaction times. A morphological evolution towards platy particles and stacks occurred at increasing run times. Identification of the several phases was carried out using a combination of X-ray diffraction and transmission/analytical electron microscopy. Analytical data indicate that the Mg content in kaolinite increased as a function of the reaction time and temperature, reaching up to 0. 46 atoms per half formula unit (a. p. h. f. u. ). The measured (Mg+Ni) content reached up to 0. 56 a. p. h. f. u. . Both the gradual increase of the b-cell parameter of kaolinite at increasing Mg contents and the presence of new bands on the FTIR spectra of the synthesized kaolinite point to a Mg-for-Al replacement in the octahedral sheet rather than to the presence of serpentine-like layers interstratified in the kaolinite structure.
Ayudas:	Ministerio de Educación y Ciencia BTE-2003-01382
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Al-rich Serpentine ; FTIR ; Hydrothermal Synthesis ; Mg-rich Kaolinite ; TEM/AEM ; XRD
Publicado en:	Clays and Clay Minerals, Vol. 54, Núm. 6 (2006) , p. 667-677, ISSN 1552-8367

DOI: 10.1346/CCMN.2006.0540602

11 p, 1.6 MB  Acceso restringido a la UAB

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