Conductivity study by complex impedance spectroscopy of Na3Nb4As3O19

AbstractCrystals of Na3Nb4As3O19 were synthesized by a solid-state reaction. It crystallizes in the orthorhombic system, space group C2221 with a=13.014(2)Å, b=24.170(3)Å and c=5.0880(9)Å. The structure can be described as a three-dimensional anionic framework containing two kinds of tunnels parallel to [001] direction where Na+ cations are located. The ionic conductivity was measured, on pellets of polycrystalline powders, between 573 and 893K in the frequency range 0.01–13000kHz through the complex impedance method. A correlation between electrical and structural properties was also discussed