A new anion conductive bismuth–vanadium oxyfluoride

First published as an Advance Article on the web 28th March 2002 A new anion conductive oxyfluoride Bi2VO5F0.7 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, Rp ~ 4.41, Rwp ~ 9.50%). The transport properties of this compound have been studied as a function of temperature by impedance spectroscopy. The relation of the Bi2VO5F0.7 crystal structure and anion conductivity with different modifications of Bi2VO5.5 oxide is discussed. 1