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Issue 18, 2011
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Synthesis and thermal behaviour of gallium-substituted aluminosilicate inorganic polymers

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Abstract

A combined sol–gel and solid-state method reported for the synthesis of gallium silicate analogues of aluminosilicate inorganic polymers has also been extended to the formation of related compounds with a range of Al-for Ga substitutions. Homogeneous, robust products were obtained at an optimum composition of SiO2:(Ga2O3 + Al2O3) = 7. After curing at 40 °C, all the products were typically X-ray amorphous, and the Al and Ga was shown by 27Al and 71Ga MAS NMR spectroscopy to be in solely tetrahedral coordination. The 29Si MAS NMR spectra were as expected for silicate inorganic polymers, but also indicated the presence of some unreacted silica. Electron microscopy in conjunction with EDS elemental mapping showed that the Ga, Al and Si was homogeneously distributed in the products. Thermal treatment of these compounds results in endothermic water loss at about 75–160 °C followed by an exothermic event at about 950 °C corresponding to crystallization of KGaSi2O6 in the gallium end-member. By contrast, the Al-substituted compounds never fully crystallised, but melted at 1200 °C to an X-ray amorphous product.

Graphical abstract: Synthesis and thermal behaviour of gallium-substituted aluminosilicate inorganic polymers

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Article information


Submitted
02 Aug 2010
Accepted
08 Feb 2011
First published
09 Mar 2011

Dalton Trans., 2011,40, 4865-4870
Article type
Paper

Synthesis and thermal behaviour of gallium-substituted aluminosilicate inorganic polymers

A. T. Durant, K. J. D. MacKenzie and H. Maekawa, Dalton Trans., 2011, 40, 4865
DOI: 10.1039/C0DT00941E

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