The effect of Co addition on the electrical conductivity of Sr- and Mg-doped LaAlO3
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- 作者：Ji Young Park and Gyeong Man Choi
- 关键词：Mixed conductor ; Electrical conductivity ; Perovskite ; LaAlO3
- 刊名：Journal of Electroceramics
- 出版年：2006
- 出版时间：December, 2006
- 年：2006
- 卷：17
- 期：2-4
- 页码：787-791
- 全文大小：353 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Optical and Electronic Materials
Ceramics,Glass,Composites,Natural Materials
Characterization and Evaluation Materials
Electrochemistry
Crystallography - 出版者：Springer Netherlands
- ISSN：1573-8663
文摘
Co was added to see its effect on the electrical conductivity of Sr- and Mg-doped LaAlO3 (La0.9Sr0.1 Al0.9Mg0.1O3, LSAM). Electrical conductivities of La0.9Sr0.1(Al0.9Mg0.1)1− xCoxO3 (LSAMC) for x = 0–0.20 were measured using 2-probe a.c. and 4-probe d.c. method at temperature between 300 and 1300∘C in air, and as a function of Po 2 (1–10−15 atm) at 1200∘C. Electrical conductivities in air increased with increasing Co content, while their activation energy decreased. From the impedance spectroscopy analysis, it was found that both the grain and the grain boundary conductivities of LSAMC samples increased rapidly with Co-addition. LSAMC samples were oxygen ion conductors in low Po2 and mixed conductors in high Po 2 up to x = 0.1 just like LSAM. With Co-doping, p-type conductivities increased, however, ionic conductivities remained nearly constant.