Please use this identifier to cite or link to this item: http://dx.doi.org/10.18419/opus-14986
Authors: Bäucker, Christian
Becker, Peter
Morell, Keshia J.
Niewa, Rainer
Title: Novel fluoridoaluminates from ammonothermal synthesis : two modifications of K2AlF5 and the elpasolite Rb2KAlF6
Issue Date: 2022
metadata.ubs.publikation.typ: Zeitschriftenartikel
metadata.ubs.publikation.seiten: 13
metadata.ubs.publikation.source: Inorganics 10 (2022), No. 7
URI: http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-150056
http://elib.uni-stuttgart.de/handle/11682/15005
http://dx.doi.org/10.18419/opus-14986
ISSN: 2304-6740
Abstract: Two new modifications of the pentafluoridoaluminate K2AlF5 were obtained from ammonothermal synthesis at 753 K, 224 MPa and 773 K, 220 MPa, respectively. Both crystallize in the orthorhombic space group type Pbcn, with close metric relations and feature kinked chains of cis-vertex-connected AlF6 octahedra resulting in the Niggli formula ∞1{[AlF2/2eF4/1t]2-}. The differences lie in the number of octahedra necessary for repetition within the chains, which for K2AlF5-2 is realized after four and for K2AlF5-3 after eight octahedra. As a result, the orthorhombic unit cell for K2AlF5-3 is doubled in chain prolongation direction [001] as compared to K2AlF5-2 (1971.18(4) pm versus 988.45(3) pm, respectively), while the unit cell parameters within the other two directions are virtually identical. Moreover, the new elpasolite Rb2KAlF6 is reported, crystallizing in the cubic space group Fm3-m with a = 868.9(1) pm and obtained under ammonothermal conditions at 723 K and 152 MPa.
Appears in Collections:03 Fakultät Chemie

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