| 학회 |
한국재료학회 |
| 학술대회 |
2013년 봄 (05/23 ~ 05/24, 여수 엠블호텔(THE MVL)) |
| 권호 |
19권 1호 |
| 발표분야 |
C. 에너지/환경 재료(Energy and Environmental Materials) |
| 제목 |
Electrical Characterization of Beta Alumina by Impedance Spectroscopy |
| 초록 |
Beta alumina has a crystal structure composed of spinel blocks and sodium oxide conducting planes in c-axis direction and thus exhibits a huge conduction anisotropy. For the practical application polycrystalline materials are used e.g. for Na-S battery and AMTEC. Beta alumina samples were prepared by different processing routes. AC 2-probe impedance measurements on disk pellets were conducted using various electrodes of Pt, Au, and Na over a wide frequency and temperature range using a cryostat and a hot-stage. (sodium metal electrodes were used below 80°C). AC 4-probe method was also applied on a bar shape sample using Au paste and wire electrodes. AC 2-probe impedance spectra exhibit complicated response and the analysis scheme has not been yet established. Low temperature measurements revealed more clearly microstructure-dependent electrical properties of beta alumina. At higher temperature the electrode polarization dominates the AC response. AC 4-probe method was shown to separate sample response from the electrode polarization. Two measurements were shown consistent by a parametric analysis of the imepdance spectra using a new equivalent circuit model where two parallel conduction paths with different blocking effects are connected by distributed shunt capacitances. |
| 저자 |
Jee-Hoon Kim1, Eui-Chol Shin2, Soo-Seok Kim1, Kee-Deok Yang2, Jin-Hyung Beom3, Jaekook Kim4, Shu Yamaguchi3, Jong-Sook Lee4
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| 소속 |
1School of Materials Science and Engineering, 2Chonnam National Univ., 3Fine Tech Co., 4Ltd. |
| 키워드 |
beta alumina; electrode; transmission line model
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| E-Mail |
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