a b s t r a c tA series of cobalt-doped bismuth molybdates were synthesized and investigated using X-ray powder diffraction, transmission electron microscopy and impedance spectroscopy.

Abstract-The possibility of synthesizing oxygen ionic conductors from substituted bismuth molybdates containing columns, MoO 4 tetrahedra, and isolated Bi ions in their structure was studied. The specifics of their structure and electric conductivity were investigated. The general formula of the solid solu tions can be recorded as Bi 13 Mo 5 -x Me x O 34 -δ , where Me is the four or five valent d metal (Ti, Zr, V, Nb). The electric conductivity of doped bismuth molybdates considerably increased compared with that of the matrix compound. The electric conductivity reached 5.5 × 10 -3 S cm -1 at 700°C and 1.8 × 10 -4 S cm -1 at 350°C for the zirconium doped compound with x = 0.4. The porosity of the ceramics was less than 5%; the thermal expansion coefficient was of the order of 14 × 10 -6 K -1. Based on the set of their characteristics, these compounds are recommended as materials for membranes of electrochemical devices.

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