Bi2W1-xCuxO6-x (0.7 ≤ x ≤ 0.8): A New Oxide-Ion Conductor.

Anion-deficient Aurivillius phases of the general formula, Bi2W1–xCuxO6 – 2x, possessing orthorhombic/tetragonal Bi2WO6-like structures, have been synthesized by quenching the oxide melts. The tetragonal phase stabilized for the compositions 0.7⩽x⩽0.8 is a good oxide-ion conductor in the temperature range 500–900 K, the x= 0.7 composition exhibiting the highest conductivity in the series.