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.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Inorganic Crystal Structure Data Base–ICSD (Fachinformationzentrum (FIZ), Karlsruhe).
L. O. Atovmyan, O. S. Filipenko, V. I. Ponomarev, and V. A. Bakaev, Dokl. Akad. Nauk SSSR 262 (3), 638 (1982).
S. M. Haile, B. J. Wuensch, R. A. Laudise, and J. Maier, Acta Crystallogr. B 53, 7 (1997).
D. Yu. Pushcharovskii, O. G. Karpov, E. A. Pobedimskaya, and N. V. Belov, Dokl. Akad. Nauk SSSR 234 (6), 1323 (1977).
S. M. Haile and B. J. Wuensch, Acta Crystallogr. B 56, 349 (2000).
L. A. Groat, Can. Mineral. 36, 801 (1998).
S. M. Haile, J. Maier, B. Wuensch, and R. A. Laudise, Acta Crystallogr. B 51, 673 (1995).
H. Jacobsen and G. Meyer, Z. Kristallogr. 210, 363 (1995).
M. I. Chiragov, Kh. S. Mamedov, and T. Z. Kulieva, Kristallografiya 28 (6), 1204 (1983).
V. I. Ponomarev, O. S. Filipenko, A. I. Chekhlov, and L. O. Atovmyan, Khim. Fiz. 2 (12), 1603 (1983).
APEX2 (Bruker AXS Inc., Madison, Wis., 2009).
G. M. Sheldrick, SHELXL-97: Program for Structure Refinement (Univ. of Göttingen, Germany, 1997).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © A.P. Topnikova, E.L. Belokoneva, O.V. Dimitrova, A.S. Volkov, Yu.V. Nelyubina, 2016, published in Kristallografiya, 2016, Vol. 61, No. 4, pp. 553–557.
Rights and permissions
About this article
Cite this article
Topnikova, A.P., Belokoneva, E.L., Dimitrova, O.V. et al. Na3Tb3[Si6O18] · H2O, a synthetic analogue of microporous mineral gerenite. Crystallogr. Rep. 61, 576–580 (2016). https://doi.org/10.1134/S1063774516040234
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063774516040234