Abstract
A new barium niobium sulfide has been prepared by controlling the partial pressure of sulfur. The single phase of the sulfide could be synthesized at 1000°C when the chemical composition was maintained at x = 5.67 in BaNbxSy and the sulfur partial pressure at 23.7 kPa. This sulfide has a homogeneity range with the variation of the Ba and Nb ratio. The range of the homogeneity varies with the sulfur partial pressure in the preparation. The X-ray powder diffraction pattern of this sulfide could be indexed on the basis of a hexagonal cell with the lattice parameters of a = 0.33363(2) nm and c = 1.7680(2) nm. The electron diffraction pattern, however, reveals superspots which are diffuse in the a∗−b∗ plane and streak in the c∗ axis. The sulfide exhibits temperature independent paramagnetism. In addition to this sulfide, six more new sulfides were found in the composition of 2.8 <x < 10.1 in BaNbxSy. The preparation of those compounds with single phase has not succeeded yet.
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