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Issue 9, 2010
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Synthesis and in situ transformation of PST-1: a potassium gallosilicate natrolite with a high Ga content

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Abstract

The synthetic details of a novel potassium gallosilicate natrolite with Si/Ga = 1.28, denoted PST-1, are described. The presence of K+ and Ga with well-defined levels of concentration in the synthesis mixture is essential for directing its crystallisation. PST-1 transforms rapidly into TNU-6 under hydrothermal conditions, behaviour that contrasts sharply with its very high thermal and hydrothermal stability, which is unusual for a material of such a high Ga content. These stability issues are discussed and rationalized based on chemical composition, likely violations of Loewenstein's rule and the temperature of dehydration of as-made K-PST-1. The crystal structure of TNU-6 has been resolved through the combined use of synchrotron X-ray and electron diffraction data; it has the BaFeGaO4 structure type with an additional √3a×√3a“GeAlO4” superstructure that arises from tilting of some of the tetrahedral units in all of the 6-rings.

Graphical abstract: Synthesis and in situ transformation of PST-1: a potassium gallosilicate natrolite with a high Ga content

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Publication details

The article was received on 01 Oct 2009, accepted on 04 Dec 2009 and first published on 12 Jan 2010


Article type: Paper
DOI: 10.1039/B920540N
Citation: Dalton Trans., 2010,39, 2246-2253
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    Synthesis and in situ transformation of PST-1: a potassium gallosilicate natrolite with a high Ga content

    J. Shin, S. H. Kim, M. A. Camblor, S. J. Warrender, S. R. Miller, W. Zhou, P. A. Wright and S. B. Hong, Dalton Trans., 2010, 39, 2246
    DOI: 10.1039/B920540N

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