Preparation of Lanthanum Sulfides Using Carbon Disulfide as a Sulfurizing Agent and the Change of These Sulfides on Heating in Air

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  • 二硫化炭素による硫化ランタンの合成とそれら硫化物の空気中での加熱変化

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Description

Some investigations were made on the preparation of lanthanum sulfides from lanthanum oxide using carbon disulfide as a sulfurizing agent. Three kinds of sulfides were obtained in a temperature range of 500-4400°C. The composition and structure of the reaction products were as follows: below 650°C, LaS2, cubic, a=8.19 A: 700-1300°C, A*-La2S8, structure unknown: above 1350°C, C-La2S3, cubic, a=8.72 A.<BR>In order to know the thermal stability of these sulfides the change of these sulfides on heating in air was also investigated by means of DTA, TGA and X-ray diffraction method. These sulfides were found to form La2O2- above 1300°C after the thermal decomposition of intermediate compounds such as La2O2-S2, La2O2-S and La2O2-SO4.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1972 (12), 2438-2440, 1972-12-10

    The Chemical Society of Japan

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