Mechanochemical Synthesis of Alkaline Earth Carbides and Intercalation Compounds

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• 作者：Sandra M. Hick ; Carolin Griebel ; Richard G. Blair*
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：March 2, 2009
• 年：2009
• 卷：48
• 期：5
• 页码：2333-2338
• 全文大小：169K
• 年卷期：v.48,no.5(March 2, 2009)
• ISSN：1520-510X

文摘

High-energy ball milling has been successfully employed to produce alkaline earth carbides from the elements. In particular, CaC₂ yields of up to 98% can be realized in as little as 12 h. Similarly, the carbides of Mg (39% yield), Sr (87% yield), and Ba (82% yield) have been prepared. An intermediate in the synthesis of CaC₂ is the newly discovered gold-colored Ca-graphite intercalation compound CaC₆. Sr and Ba also go through initial intercalation phases (SrC₆ and BaC₆) before ultimately producing the carbides. The magnesium product consisted of Mg₂C₃ with no MgC₂ observed. The addition of sulfur to CaC₂ forming reactions did not adversely affect the overall synthesis; this suggests that this method may be utilized to sequester sulfur from high-sulfur coal. The preparation of these compounds by high-energy ball milling represents a novel method for producing pure carbides, as well as a convenient route to isotopically enriched ethyne.