Abstract
Single crystals of Ca 3.15Li 0.85IrO 6, Sr 3LiIrO 6, Ca 3LiRuO 6 and Sr 3LiRuO 6 were synthesized by high temperature flux growth. The compounds crystallize with trigonal (rhombohedral) symmetry in the space group R3̄c, Z=6: Ca 3.15Li 0.85IrO 6 a=9.2686(3) Å, c=10.8755(5) Å; Sr 3LiIrO 6 a=9.6355(3) Å, c=11.1439(4) Å; Ca 3LiRuO 6 a=9.2330(3) Å, c=10.7441(4) Å; Sr 3LiRuO 6 a=9.6294(4) Å, c=11.0963(5) Å. All structures were determined by single crystal X-ray diffraction. The four oxides, A 3LiMO 6 (A=Ca, Sr; M=Ir, Ru), are isostructural with the K 4CdCl 6 structure type and contain infinite one-dimensional chains of alternating face-sharing MO 6 octahedra and LiO 6 trigonal prisms. These chains, in turn, are separated by infinite chains of alkaline–earth cations. The magnetic susceptibility of Ca 3.15Li 0.85IrO 6 is consistent with that of a simple paramagnet.
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