Preparation and Characterization of BiM2X5 (M = Ti, Nb, Ta; X = S, Se), New Composite-Layered Chalcogenides

Abstract
A few BiM2X5-type of chalcogenides(BiTi2S5, BiNb2S5, BiTa2S5, BiNb2Se5) have been prepared from the elements. On the basis of powder X-ray diffraction, it is suggested that they have composite-layered structure in which a BiX layer and two adjacent BX2 layers are stacked alternately. Intercalation of hydrazine into BiM2X5 has been observed.

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