Two structure types based on Si₆O₁₅ rings

Autor(en)

Maria Wierzbicka-Wieczorek, Martin Göckeritz, Uwe Kolitsch, Christoph Lenz, Gerald Giester

Abstrakt

The silicate Cs1.86K1.14DySi6O15 represents a mixed tetrahedral-?octahedral framework structure type based on roughly circular Si6O15 rings and isolated DyO6 octahedra. The silicate Cs1.6K1.4SmSi6O15 has a layered at. arrangement built from corrugated Si6O15 layers contg. four-?, six- and eight-?membered rings. The layers are connected by isolated SmO6 octahedra to form a mixed tetrahedral-?octahedral framework. This structure shows a close structural relationship to ß-?K3NdSi6O15 and a less close one to dehydrated elpidite (Na2ZrSi6O15)?. In both structures, Cs?/K atoms occupy large voids. The silicates were obtained through high-?temp. flux syntheses. Their crystal structures have been detd. from single-?crystal X-?ray diffraction data. Cs1.86K1.14DySi6O15 crystallizes in R32 (no. 155) with a = 13.896(2)?, c = 35.623(7) Å and V = 5957.2(17) Å3, whereas Cs1.6K1.4SmSi6O15 crystallizes in Cmca (no. 64) with a = 14.474(3)?, b = 14.718(3)?, c = 15.231(3) Å and V = 3244.7(11) Å3. The Dy3+ and Sm3+ cations present in the silicates cause PL emission bands in the visible yellow-?to-?orange spectral range.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Naturhistorisches Museum Wien (NHM), Friedrich-Schiller-Universität Jena

Journal

European Journal of Inorganic Chemistry

Band

2015

Seiten

2426-2436

Anzahl der Seiten

11

ISSN

1434-1948

DOI

https://doi.org/10.1002/ejic.201500091

Publikationsdatum

04-2015

Peer-reviewed

Ja

ÖFOS 2012

104011 Materialchemie, 105113 Kristallographie

Schlagwörter

ASJC Scopus Sachgebiete

Inorganic Chemistry

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/two-structure-types-based-on-si6o15-rings(1dd76d7f-2115-4d1c-a766-3fddd9a7b258).html