ic2019555_si_003.pdf (67.77 kB)
Hydrothermal Descriptive Chemistry and Single Crystal Structure Determination of Cesium and Rubidium Thorium Fluorides
journal contribution
posted on 2016-02-22, 14:22 authored by Christopher
C. Underwood, Matthew Mann, Colin D. McMillen, Joseph W. KolisTwo new cesium thorium fluorides and three new rubidium
thorium
fluorides have been synthesized hydrothermally and structurally characterized.
The structures of two polymorphs of CsTh3F13 are described in space group P6/mmm with a = 8.2608(14) and c = 8.6519(17)
and space group Pmc21 with a = 8.1830(16), b = 7.5780(15), and c = 8.6244(17). The analogous orthorhombic compound RbTh3F13, with a = 8.1805(16), b = 7.4378(15), and c = 8.6594(17) in space group Pmc21, is also reported. Two other rubidium thorium
fluorides are also described: RbTh2F9 crystallizes
in the space group Pnma where a =
8.9101(18), b = 11.829(2), and c = 7.4048(15), and Rb7Th6F31 crystallizes
in the space group R3̅ where a = 15.609(2) and c = 10.823(2). Comparison of these
materials was made on the basis of their structures and synthesis
conditions. The formation of these species in hydrothermal fluids
appears to be dependent upon the concentration of the alkali fluoride
mineralizer solution and, thus, the ratio of alkali ions to thorium
in the system.