Effect of Microstructural Design on the Electrical Properties of Y2O3-Stabilized ZrO2

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J. Korean Ceram. Soc. > Volume 30(9); 1993 > Article

Journal of the Korean Ceramic Society 1993;30(9): 717.

미세구조 설계에 따른 이트리아 안정화 지르코니아의 전기적 성질 변화

김선재, 김경호, 오석진, 강대갑, 국일현

한국원자력연구소 정밀요업재료개발팀

Effect of Microstructural Design on the Electrical Properties of Y2O3-Stabilized ZrO2

ABSTRACT

Effects of microstructures on the electrical properties of ZrO2 based ceramics were analyzed by modeling layer arrangements and mixed phase structures. Single layers and alternating multilayers were made from 3mol% and 8mol% Y2O3 doped ZrO2 powders, while mixed specimen was made by blending and compacting these raw powders. After sintering at 150$0^{circ}C$ for 2hr in air, AC impedance characteristics were measured. Contributiion of bulk comonent to total resistivity and its temperature-dependence were larger in 8Y-ZrO2 single layer than in 3Y-ZrO2 single layer. The multilayered specimen connected in serial to electrodes showed partial characteristics of both 3Y-ZrO2 and 8Y-ZrO2 single layers. The multilayered specimen connected in parallel to electrodes and the mixed specimen exhibited characteristics mainly of 8Y-ZrO2 single layer. The multilayered specimen connected in parallel to electrodes revealed the highest electrical conductivity near the operating temperature of solid oxide fuel cell. However, it is expected that the mixed specimen is appropriate for the applications because of its relatively high electrical conductivity with high strength expected.