Synthesis of Cu₂Mo₆S₈ powders and thin films from intermediate oxides prepared by polymeric precursor method

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• 作者：S. Boursicot ; V. Bouquet ; ^{valerie.bouquet@univ-rennes1.fr} ; I. Pé ; ron ; T. Guizouarn ; M. Potel ; M. Guilloux-Viry
• 关键词：Chevrel phases ; CuxMo6S8 ; Sulfides ; Insertion material ; Polymeric precursors ; Thin films
• 刊名：Solid State Sciences
• 出版年：2012
• 期刊代码：98_12932558
• 类别：ch
• 出版时间：June, 2012
• 卷：14
• 期：6
• 页码：719-724
• 文件大小：1251 K

摘要

Powders and thin films of the copper molybdenum sulfide Cu₂Mo₆S₈ were synthesized from intermediate oxides prepared by polymeric precursor method based on Pechini process. In the case of the thin films, deposition was performed onto R-plane sapphire single crystal by spin coating. The influence of temperature and duration of the 3 step heat treatment cycle (calcination, sulfurization and reduction) were investigated to optimize the synthesis conditions. The first step of calcination under air atmosphere performed for 3聽h at 450聽掳C and 400聽掳C is suitable to obtain the intermediate oxides powders and thin films, respectively. The sulfurization treatment at 600聽掳C for 2聽h under H₂S/H₂ gas flow followed by reduction at 650聽掳C for 4聽h under H₂ gas flow allowed to obtain Cu₂Mo₆S₈ in powder or thin film form. In the last case, a multilayer process led to dense and homogeneous films. Moreover, the insertion and superconducting behaviour of the final powders allowed to validate the Cu₂Mo₆S₈ synthesis by this moderate temperature process.