Abstract
Rare earth copper sulfides, 2 (Ln = Ce, Pr, Nd, Sm, Gd and Tb), powders were synthesized by the following procedure: (1) complex oxide was synthesized using the polymerized complex method, and (2) LnCuO 2 was sulfurized by the CS 2 gas. CS 2 gas sulfurization combined with a polymerized complex method can reduce a reaction temperature and a duration time. TG-DTA and XRD results indicated that Ln'-Cu polymerized complex (Ln = Pr, Nd, Sm and Gd) was decomposed into Ln'203 (via Ln' 2 OCO 3 ) and Cu/CuO. Ln' 2 0 3 reacted with CuO to form Ln' 2 CuO 4 complex oxide. In the case of Ce and Tb (Ln), a Ln-Cu polymerized complex was decomposed into (LnO 2 and Cu/CuO. Ln 2 CuO 4 phase was not observed in these cases. In sulfurization reaction, XRD indicates that Ln'CuS 2 was formed via a formation of Ln'OCuS. On the other hand, LnCuS 2 is considered to be formed via a solid state reaction between Ln 2 S 3 and Cu 2 S. The contents of oxygen and carbon impurities in the products depend on the sulfurization reaction conditions. For example, the PrCuS 2 powder was obtained with low impurity contents of 0.07 mass% C and 0.073 mass% O by sulfurization at 1223 K.
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