The mixture conductor Cu2Mo6S7.7.Cu2Mo6S8.0 and Cu4Mo6S8.0 of Cu system was obtained under controlled processing condition. It was confirmed to be the single phase similar to the Mo6S8 by X-ray diffraction analysis . and the stoichiometric composition was detected by chemical analytic method. Their total conductivity σ and ionic conductivity σi were measured. The compositon of Cu2Mo6S7.7 and solid electrolyte Rb4Cu16Cl13 is superior to CuxMo6S8-y in electrochemical properties
the total conductivity and ionic conductivity are 75 （Ω· cm）-1 and 7 × 10-2 （Ω·cm）-1 at the composite ratio 2 : 1.
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