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Na 3 Tb 3 [Si 6 O 18 ] · H 2 O, a synthetic analogue of microporous mineral gerenite

Na 3 Tb 3 [Si 6 O 18 ] · H 2 O, a synthetic analogue of microporous mineral gerenite Abstract Crystals of a new silicate, Na3Tb3[Si6O18] · H2O, space group \(P\bar 1\), are obtained under hydrothermal conditions. The formula of the compound is determined in the course of structure solution. The silicate is a synthetic analogue of the gerenite mineral (Ca1.21Na0.57)(Y2.24Dy0.68)Si6O18 · 2H2O, whose structure contains six-membered rings formed by SiO4 tetrahedra. The [Si6O18] rings are connected by TbO6 octahedra into a mixed microporous framework with voids filled by Na atoms and water molecules. The new silicate differs from gerenite by the occupation of the Ca position by Na atoms and population of the pores sandwiched between six-membered rings. By virtue of conditions of hydrothermal synthesis in the absence of Ca and excess of Na in the system, an additional Na position appears in the void. It is populated statistically, and in gerenite it was occupied by water molecules only. In the new structure, the position of water is split into two statistically populated positions. The inclusion of Na atoms in additional positions in framework pores and their high thermal vibrations are indicative of ion-exchange properties of the structure. Possible paths of ion exchange are discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

Na 3 Tb 3 [Si 6 O 18 ] · H 2 O, a synthetic analogue of microporous mineral gerenite

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References (8)

Publisher
Springer Journals
Copyright
2016 Pleiades Publishing, Inc.
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/s1063774516040234
Publisher site
See Article on Publisher Site

Abstract

Abstract Crystals of a new silicate, Na3Tb3[Si6O18] · H2O, space group \(P\bar 1\), are obtained under hydrothermal conditions. The formula of the compound is determined in the course of structure solution. The silicate is a synthetic analogue of the gerenite mineral (Ca1.21Na0.57)(Y2.24Dy0.68)Si6O18 · 2H2O, whose structure contains six-membered rings formed by SiO4 tetrahedra. The [Si6O18] rings are connected by TbO6 octahedra into a mixed microporous framework with voids filled by Na atoms and water molecules. The new silicate differs from gerenite by the occupation of the Ca position by Na atoms and population of the pores sandwiched between six-membered rings. By virtue of conditions of hydrothermal synthesis in the absence of Ca and excess of Na in the system, an additional Na position appears in the void. It is populated statistically, and in gerenite it was occupied by water molecules only. In the new structure, the position of water is split into two statistically populated positions. The inclusion of Na atoms in additional positions in framework pores and their high thermal vibrations are indicative of ion-exchange properties of the structure. Possible paths of ion exchange are discussed.

Journal

Crystallography Reports – Springer Journals

Published: Jul 1, 2016

Keywords: Crystallography and Scattering Methods

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