Synthesis, Electronic and Crystal Structures, and Physical Studies of the Superconductor Cs1Mo12S14, Final Step of the Condensation of the Mo6L8<

详细信息    查看全文

• 作者：Patrick Gougeon ; Diala Salloum ; Jrme Cuny ; Laurent Le Polls ; Marie Le Floch ; Rgis Gautier ; Michel Potel
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：September 7, 2009
• 年：2009
• 卷：48
• 期：17
• 页码：8337-8341
• 全文大小：836K
• 年卷期：v.48,no.17(September 7, 2009)
• ISSN：1520-510X

文摘

The ternary reduced molybdenum sulphide Cs₁Mo₁₂S₁₄ has been synthesized by solid-state reaction at 1400 °C for 96 h in sealed molybdenum crucibles. The compound crystallizes in the trigonal space group P1c with the following lattice parameters: a = 9.9793 (2) Å, c = 6.3730 (2) Å, Z = 1. Its crystal structure was determined from single crystal X-ray diffraction data and consists of interconnected Mo₆S₈ⁱS₆^a units forming an original three-dimensional framework in which large tunnels are occupied randomly by the Cs⁺ ions. ¹³³Cs static NMR studies are in favor of a static cesium disorder. Unlike Ba₄Mo₁₂S₁₈ where some Mo₆S₈ⁱS₆^a units are also connected through S^i-i ligands, this connection mode does not lead to significant interactions in the title compound. Single-crystal resistivity measurements show that Cs₁Mo₁₂S₁₄ presents a metallic behavior with a superconducting transition at 7.7 K as confirmed by magnetic measurements.