文摘
A series of cobalt-doped bismuth molybdates were synthesized and investigated using X-ray powder diffraction, transmission electron microscopy and impedance spectroscopy. The ranges of solid solution were determined. Two new compounds, Bi1?xCox[Bi12O14]Mo5O34.5¡À¦Ä (x=0.2) and Bi[Bi12O14]Mo5?yCoyO34.5¡À¦Ä (y=0.2), which crystallise in monoclinic unit cells have been examined in detail by diffraction methods. Impedance spectroscopy measurements show that the studied materials are good ionic conductors with conductivity values about 5¡Á10?3 S¡Ácm?1 at 973 K and 1.7¡Á10?4 S¡Ácm?1 at 623 K, which are similar to conductivity values of yttrium substituted zirconia and (YSZ) gadolinium doped ceria (CGO).