The synthesis and crystal structure of the lowtemperature polymorph of barium zirconium sulfide is reported. The title compound contains double BaZrS3 perovskite layers separated by BaS layers. The compound is the n = 2 member of the Ban+lZrnS3n+¿ Ruddlesden-Popper sulfides. This polymorph of Ba3Zr2S7 was crystallized at 1203 K in a BaC12/CsCI eutectic flux and has P42/mnm crystal symmetry in contrast to the high-temperature polymorph which has 14/mmm crystal symmetry.

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A novel mixed-valence, quasi-two-dimensional bismuth calcium titanium(III/IV) sulfide, Bi^Ca^TisS^(x = 3.08) is reported as a commensurate structure for the first time in the class of misfit-layer compounds. Since the first synthesis of "PbTiS3",1 a large collection of structurally categorized misfit-layer compounds have been studied with general formulations close to AMQ3 and AM2Q5 (A = Sn, Pb, Bi, a rare-earth element; M = Ti, V, Cr, Nb, Ta).1-6 Their framework consist of an intergrowth of two types of layered lattices, i.e., mixed layers of NaCl/CdI2 for M = Ti, V, and Cr1-3 or NaCl/MQ2 (trigonal prismatic MQ6) for M = Nb and Ta.3-6 Owing to a mismatch between the two sublattices, the structural frameworks reported so far are incommensurate, subsequently structural analysis has been carried out by powder X-ray diffraction, electron diffraction, and, in some cases, single-crystal X-ray diffraction with structural solutions in two sublattices.5 Recently, these type of compounds have been extensively investigated for their interesting super-(1) (a) Sterzel, W.; Horn,

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