Abstract
The syntheses, structure and ionic conductivity of Ag12.4Na1.6Mo18As4O71 are reported. Crystals and polycrystalline powders are synthesized by solid state reaction. It crystallized in the monoclinic space group C2/c with a = 20.032 Å, b = 16.872 Å, c = 19.373 Å and β = 112.14°. The structure can be described by the assemblage of Mo8As2O34 ribbons interconnected through Mo2O7 groups. Monovalent cations are located around these ribbons. The ionic conductivities have been measured, on pellets of polycrystalline powders, between 423 and 663 K in the frequency range 1–13000 Hz, using diagrams of complex impedance. Impedance analysis suggests the presence of a dependent electrical relaxation temperature process in the material. Activation energy was obtained from Arrhenius plots (log σT versus 1000/T) and found to be 0.6 eV. The activation energies obtained from impedance and loss spectra are close. It suggests that the ionic transport in the elaborated material is due to a hopping mechanism. The dependence in frequency of the ac conductivity is found to obey Jonsher's relation.
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