Abstract

A new anion conductive oxyfluoride Bi₂VO₅F_0.7 has been obtained. Its crystal structure, related to the well-known Aurivillius phases, has been determined from powder X-ray and neutron diffraction data combined with a piezo test and magnetic measurements (I4mm, a = 3.869(3) Å, c = 15.648(6) Å, R_p = 4.41, R_wp = 9.50%). The transport properties of this compound have been studied as a function of temperature by impedance spectroscopy. The relation of the Bi₂VO₅F_0.7 crystal structure and anion conductivity with different modifications of Bi₂VO_5.5 oxide is discussed.