Cobalt-doped Bi₂₆Mo₁₀O₆₉: Crystal structure and conductivity

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• 作者：Z.A. Mikhailovskaya ; E.S. Buyanova ; S.A. Petrova ; M.V. Morozova ; V.M. Zhukovskiy ; R.G. Zakharov ; N.V. Tarakina ; I.F. Berger
• 关键词：Bismuth molybdates ; Oxygen-ion conductors ; Crystal structure ; Electrical conductivity ; Impedance spectroscopy
• 刊名：Journal of Solid State Chemistry
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：204
• 期：Complete
• 页码：9-15
• 全文大小：2220 K

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, Bi_1?xCo_x[Bi₁₂O₁₄]Mo₅O_34.5¡À¦Ä (x=0.2) and Bi[Bi₁₂O₁₄]Mo_5?yCo_yO_34.5¡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).