PRODUCTION OF SM2S3 AND SM2O2S BY THE SULFIDATION METHOD.
Keywords:
Seldom earth elements, dioxysulfides, X-rays, guanide, degradation, thiocyanate..Abstract
Seldom earth elements dioxysulfides were Ln2O2S prepared in the following reaction sequence. Compounds Ln2S3 (Ln = Nd, Sm, Gd, Dy, Lu) were prepared by reacting seldom earth elements semitoric oxides with sulfiding gases H2S –CS2. Sulfidation was carried out at temperatures of 1050-1150oC. The sequence in Ln2S3 systems is Ln2O3 at synthesis temperatures. The reflection of the Sm2O2SO4 compound is on the diffraction pattern. The diffraction pattern of the sample annealed at 700°C indicates an increased noise level. Phase change occurs when the Sm2O2SO4 compound sample is treated at 700°C [7]. The sample will first be a two-phase Sm2O2SO4 , Sm2O2S, then a single-phase Sm2O2S. As the temperature increases, the time to achieve a uniform state Sm2O2S decreases. The composition of the product is ambiguous and it is known that H2S, CS2, NH3, S, guanide and melanin are formed as a result of the degradation of the thiocyanate. Treatment was carried out to obtain semitoric samarium sulfides Sm2S3 without impurity phases according to X-rays phase analysis.
References
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Anosov V.Ya. Fundamentals of physicochemical analysis // Anosov V.Ya., Ozerova M.I., Fialkov Yu.Ya., - M .: Nauka, 1976. –P.503.
Ardashnikova E.I. Physico - chemical analysis - the basis of directional inorganic synthesis // Soros Educational Journal. 2004. -№.2. –T.8. –P.30-36.
Leptev V.I., Suponitsky Yu.L., Vorobev A.F. Obtaining oxosulfates of some lanthanides and yttrium // Journal of Inorganic Chemistry. -1987. –T.32. -№. 3. –pp.547-550.
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