A study of the alkali metal tetraselenometalate system has afforded two new isostructural phases, Cs3TaSe4 and Cs3NbSe4. The structures of these phases have been determined by X-ray and neutron powder diffraction techniques. Cs3TaSe4 crystallizes in the orthorhombic system (D162h-Pnma, a = 10.277(1), b = 11.918(1), c = 10.238(1) Å) with four formula units in the cell. The structure contains discrete TaSe3-4 ions (TaSe, 2.369(4), 2.374(7), 2.397(6) Å) and Cs+ cations. Out to 4 Å the Cs cations are surrounded by five or seven Se atoms.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry