The Solvothermal Synthesis of New Layered Silicates: The Anhydrous Phyllosilicates.

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  • Demazeau G.
    Institut de Chimie de la Matière Condensée de Bordeaux Interface Hautes Pressions - Ecole Nationale Supérieure de Chimie et de Physique de Bordeaux
  • Reig P.
    Institut de Chimie de la Matière Condensée de Bordeaux Interface Hautes Pressions - Ecole Nationale Supérieure de Chimie et de Physique de Bordeaux
  • Naslain R.
    Laboratoire des Composites

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  • The Solvothermal Synthesis of New Layer

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Abstract

The natural phyllosilicates are thermally instable due to the presence of OH group in the lattice. On the basis of the mica phlogopite type structure [KMg3 (AlSi3) O10 (OH) 2] and through the anionic substitution OH- → O2- and the cationic substitutions (Al3+ → Si4+ and Mg2+ → Al3+) a new composition has been proposed : K (Mg2Al) Si4O12 [1]. In order to get a homogeneous starting material, due to the complexity of the proposed composition [K (Mg2Al) Si4O12], the first step was the preparation of the process precursor through a sol-gel. The conventional treatment (high temperature) of such a precursor leading to the formation of a mixture of three-dimensional silicates, a solvothermal reaction was developed, the non-aqueous solvent required for the preparation of the sol being used in supercritical conditions. The resulting material appears to be a bidimensional oxide isostructural of the mica-type phlogopite. All the physico-chemical characterizations confirm such a structure and the absence of OH group in the lattice, in particular the IR spectroscopy. Through such an illustration, solvothermal reactions, appear a powerful way for preparing new materials.

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