A new anion conductive oxyfluoride Bi 2 VO 5 F 0.7 has been obtained. Its crystal structure, related to the wellknown 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 Bi 2 VO 5 F 0.7 crystal structure and anion conductivity with different modifications of Bi 2 VO 5.5 oxide is discussed.

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