Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (4) Citing Articles via Google Scholar Google Scholar Articles by Bentabol, M. Articles by Linares, J. Search for Related Content GeoRef GeoRef Citation

HYDROTHERMAL SYNTHESIS OF Mg-RICH AND Mg-Ni-RICH KAOLINITE

¹ Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Spain
² Estación Experimental del Zaidín, CSIC, Prof. Albareda 1, 18008 Granada, Spain

^* E-mail address of corresponding author: mdruiz{at}uma.es

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.

Key Words: Al-rich Serpentine • FTIR • Hydrothermal Synthesis • Mg-rich Kaolinite • TEM/AEM • XRD

This article has been cited by other articles:

				M. Bentabol, M. D. R. Cruz, and F. J. Huertas SYNTHESIS OF Ni-RICH 1:1 PHYLLOSILICATES Clays and Clay Minerals, December 1, 2007; 55(6): 572 - 582. [Abstract] [Full Text] [PDF]