Flux syntheses and crystal structures of new compounds with decorated kroehnkite-like chains
- Autor(en)
- Maria Wierzbicka-Wieczorek, Ekkehart Tillmanns, Uwe Kolitsch
- Abstrakt
The crystal structures of two novel compds., KSr6Sc(SiO4)4 and Rb5In(MoO4)4, were detd. from single-crystal X-ray diffraction data collected at room temp. Both compds. have been synthesized by the flux growth technique in the course of a research project on new micro- and nanoporous alkali-M3+ silicates. KSr6Sc(SiO4)4 represents a new structure type and the first silicate contg. decorated kroehnkite-like octahedral-tetrahedral chains. It is orthorhombic and crystallizes in Pnma, with a = 19.137(4), b = 11.197(2), c = 7.125(1) .ANG., V = 1526.7(5) .ANG.3, Z = 8. Rb5In(MoO4)4 has space group P2/c with a = 11.391(2), b = 7.983(2), c = 11.100(2) .ANG., = 113.74(3), V = 924.0(3) .ANG.3, Z = 2. It is isotypic with Rb5Er(MoO4)4. The topologies of both compds. are characterised by isolated infinite decorated kroehnkite-like chains that are built from either ScO6 or InO6 octahedra corner-linked and decorated by SiO4 or MoO4 tetrahedra. These chains are sepd. by alkali or alk. earth metals. A detailed comparison to the few other compds. based on decorated kroehnkite-like chains, viz. Ba2Ca(HPO4)2(H2PO4)2, CsM3+(H1.5AsO4)2(H2AsO4) (M3+ = Ga, Cr), CsAl(H2AsO4)2(HAsO4), K(H2O)M3+(H1.5AsO4)2(H2AsO4) (M3+ = Fe, Ga, In) and K5In(MoO4)4 is given.
- Organisation(en)
- Institut für Mineralogie und Kristallographie
- Journal
- Acta Chimica Slovenica
- Band
- 55
- Seiten
- 909-917
- Anzahl der Seiten
- 19
- ISSN
- 1318-0207
- Publikationsdatum
- 2008
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105113 Kristallographie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/8f76e0db-c08e-4d91-a71c-ecb1b16611a2