Abstract
Abstract Ternary compounds (Chevrel phase compounds) of molybdenum CuxMo6S8 were prepared by sintering mixed powders of MoS2, Mo, and CuS and employed as electrodes in aqueous solutions. Electrochemical polarization of the electrodes gives rise to intercalation and deintercalation processes of Cu+, resulting in deformative change in crystal structure of the compounds. The lattice constants of rhombohedral unit cells of the compounds are ar=6.66 Å, αr=96°, and Vr=290 Å3 for the intercalated compound Cu4Mo6S7.8, and ar=6.43 Å, αr=91.2°, and Vr=267 Å3 for the fully deintercalated Mo6S7.8. Both the copper(I) composition and the crystal structure of CuxMo6S7.8 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.
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