Abstract
The new compound Ce 20Ti 11S 44O 6 crystallizes in space group D 2 h 13-Pmmn of the orthorhombic system with two formula units in a cell of dimensions a = 22.4628(8), b = 14.2531(7), and c = 10.382(2) ( T= 293 K). Isostructural with La 20Ti 11S 44O 6, this compound comprises ∞ 2[(Ti 4S 2O 4(TiS 6) 2 2 (Ti 2S 10) 2 2 ] layers of [Ti 4S2O 4] clusters linked together by edge-sharing, rutile-like chains of TiS 6 octahedra. An additional pair of corner-sharing, oxygen-bridged, Ti-centered octahedra are found separated from the covalently-bonded layers. Charge balance restrictions require that Ti atoms be in the mixed oxidation states of 3+ or 4+. The seven crystallographically independent Ce atoms are found in three different coordination polyhedra.
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