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Synthesis of Ni-rich 1:1 phyllosilicates

Published online by Cambridge University Press:  01 January 2024

Maria Bentabol ,
Maria Dolores Ruiz Cruz  and
F. Javier Huertas
Maria Bentabol
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Spain
Maria Dolores Ruiz Cruz*
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Spain
F. Javier Huertas
Affiliation:
Estación Experimental del Zaidín, CSIC, Prof. Albareda 1, 18008 Granada, Spain
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Rapid dissolution of partly amorphized kaolinite in the systems kaolinite + NiCl2, kaolinite + Ni(OH)2, and kaolinite + NiCl2 + Ni(OH)2, 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 the 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)2-richest systems. The presence of Ni(OH)2 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: (Al1.24Ti0.01Fe0.02Ni1.31) (Si1.58Al0.42)O5(OH,Cl)2.

Keywords

Al-Ni-serpentineFTIRHydrothermal SynthesisNi-kaoliniteTEM/AEMXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 55 , Issue 6 , December 2007 , pp. 572 - 582
Copyright
Copyright © 2007, The Clay Minerals Society

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