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

AuthorsShin, Jiho; Kim, Seok Han; Camblor, Miguel Ángel ; Warrender, Stewart J.; Miller, Stuart R.; Zhou, Wuzong; Wright, Paul A.; Hong, Suk Bong
Issue Date12-Jan-2010
PublisherRoyal Society of Chemistry (UK)
CitationDalton Transactions
AbstractThe 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 x √3a “GeAlO4” superstructure that arises from tilting of some of the tetrahedral units in all of the 6-rings.
Dalton Transactions 2010, 39, 2246-2253
DescriptionSupplementary material included at the end of the file. Material suplementario incluido al final del archivo.
Publisher version (URL)http://pubs.rsc.org/en/Content/ArticleLanding/2010/DT/b920540n
Appears in Collections:(ICMM) Artículos
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