Laboratoire de Cristallochimie et Physicochimie du Solide, ENSCL-USTLille, URA CNRS 452, B.P. 108, 59652, Villeneuve d'Ascq Cedex, France
Abstract:
A Bi2V1 ? x ? yUxBiyO5.5 + 0.5x ? y solid solution derived from Bi4V2O11 has been prepared and characterized with x up to 0.125 for y = 0. Partial substitution of U6+ for V5+ in Bi4V2O11 leads to the stabilization at room temperature of the high-oxide ion conducting γ-phase, in contrast with other M6+ dopants which stabilize the β-phase. The lower conductivity in U substituted system compared with BICUVOX.10 is attributed to its higher activation energy. Conductivity values and activation energies of the U substituted phases compare well with Bi2UO6.