Regarding the existence of the Bi2W1–xCuxO6–2x(0.7 ⩽x⩽ 0.8) solid solution

Abstract

A new family of oxide-ion conductors derived from Bi₂WO₆ and prepared by substitution of Cu^II for W^VI was recently described by Sharma et al.(J. Mater. Chem., 1994, 4, 705). Attractive performances were obtained with the Bi₂W_1-xCu_xO_6–2x(0.7 < x < 0.8) solid solution. Our experiments performed on the x= 0.75 compound are in agreement with the synthesis of a 7Bi₂O₃·2WO₃-Bi₂CuO₄-5CuO mixture rather than a new solid solution.