Electrochemical redox intercalation of copper(I) cation for CuxMo6S8 superconductor accompanied with a reversible structure change.
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概要
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Ternary compounds (Chevrel phase compounds) of molybdenum Cu<I><SUB>x</SUB></I>Mo<SUB>6</SUB>S<SUB>8</SUB> were prepared by sintering mixed powders of MoS<SUB>2</SUB>, Mo, and CuS and employed as electrodes in aqueous solutions. Electrochemical polarization of the electrodes gives rise to intercalation and deintercalation processes of Cu<SUP>+</SUP>, resulting in deformative change in crystal structure of the compounds. The lattice constants of rhombohedral unit cells of the compounds are <I>a</I><SUB>r</SUB>=6.66 Å, α<SUB>r</SUB>=96°, and <I>V</I><SUB>r</SUB>=290 Å<SUP>3</SUP> for the intercalated compound Cu<SUB>4</SUB>Mo<SUB>6</SUB>S<SUB>7.8</SUB>, and <I>a</I><SUB>r</SUB>=6.43 Å, α<SUB>r</SUB>=91.2°, and <I>V</I><SUB>r</SUB>=267 Å<SUP>3</SUP> for the fully deintercalated Mo<SUB>6</SUB>S<SUB>7.8</SUB>. Both the copper(I) composition and the crystal structure of Cu<I><SUB>x</SUB></I>Mo<SUB>6</SUB>S<SUB>7.8</SUB> can be controlled by the electric quantity in electrochemical redox treatment. Structure deformation results from change in electronic distribution of crystal, as well as in charge density of a Mo octahedral cluster, due to electrolysis.
- 公益社団法人 日本化学会の論文
著者
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Yamase Toshihiro
Research Laboratory Of Resources Utilization Tokyo Institute Of Technology
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Inoue Tooru
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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