Synthesis and some properties of Ag₈S₄O₄

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• 作者：Kurzawa ; M. ; Tomaszewicz ; E.
• 关键词：A. Inorganic compounds ; A. Semiconductors ; B. Chemical synthesis ; C. Thermogravimetric analysis (TGA) ; C. X-ray diffraction
• 刊名：Materials Research Bulletin
• 出版年：2000
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：March 1, 2000
• 卷：35
• 期：4
• 页码：637-645
• 文件大小：414 K

摘要

It has been found that in addition to the Ag₆S₃O₄ phase discovered earlier, the reaction between Ag₂SO₄ and Ag₂S in the solid state leads to a phase having the formula Ag₈S₄O₄. This phase can be obtained by heating in air a mixture comprised initially of Ag₂SO₄ (25.0 mol%) and Ag₂S (75.0 mol%). Ag₈S₄O₄ melts at 400°C. In air, the melt starts decomposing immediately. The final solid product of Ag₈S₄O₄ decomposition is metallic silver. In inert atmosphere, thermal decomposition of the melt starts at 445°C and the final solid products of the decomposition are silver sulfide and metallic silver. Ag₈S₄O₄ phase crystallizes in a monoclinic system and has the following unit-cell parameters: a = 1.42669 nm, b = 0.65824 nm, c = 1.05039 nm, β = 91.32°, Z = 4, V = 0.98617 nm³, and d_x = 7.10 g/cm³.