Gd₂O₃-ZrO₂계 고체전해질의 미세구조와 전기전도도 = Microstructures and Electrical Conductivity of Gd₂O₃-ZrO₂Solid Solution Oxide-Ion Electrolyte

다국어 초록 (Multilingual Abstract)

The zirconia ceramics containing 3～5mol％ GdO were sintered at 160℃ for 5h. With additions of less than 10mol％ of gadolinia, the sintered zirconia consists of both cubic and monoclinic crystalline phases. During sintering of the zirconia, lots of cracks developed as is typical of non-stabilized zirconia ceramics. But the addition of 15mol％ of GdO makes the zirconia stabilized as a cubic phase with lattice parameter a=5.168Å.
By two-probe impedance spectroscopy, the Cole-Cole plot for the 15mol％GdO-ZrO measured at 600℃ showed two well separated semicircles. The resistivity of the grain, R and of the grainboundary, R was 148 and 215ohm?㎝, prspectively. The blocking factor a was 0.31.
The total eletrical conductivity of 15mol％GdO-ZrO at 1000℃ was 0.15S/㎝, and the activation energy obtained from Arrhenius plot was 0.92eV.