Low-temperature sintering and electrical properties of strontium- and magnesium-doped lanthanum gallate with V2O5 additive
- Authors
- Ha, Sang Bu; Cho, Yoon Ho; Ji, Ho-Il; Lee, Jong-Ho; Kang, Yun Chan; Lee, Jong-Heun
- Issue Date
- 15-3월-2011
- Publisher
- ELSEVIER
- Keywords
- Strontium- and magnesium-doped lanthanum gallate; Solid oxide fuel cell; Vanadium oxide; Sintering additive; Phase purity; Oxide ion conductivity
- Citation
- JOURNAL OF POWER SOURCES, v.196, no.6, pp.2971 - 2978
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 196
- Number
- 6
- Start Page
- 2971
- End Page
- 2978
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/112845
- DOI
- 10.1016/j.jpowsour.2010.11.082
- ISSN
- 0378-7753
- Abstract
- The effects of a V2O5 additive on the low-temperature sintering and ionic conductivity of strontium- and magnesium-doped lanthanum gallate (LSGM: La0.8Sr0.2Ga0.8Mg0.2O2.8) are studied. The LSGM powders prepared by the glycine nitrate method are mixed with 0.5-2 at.% of VO5/2 and then sintered at 1100-1400 degrees C in air for 4 h. The apparent density and phase purity of the LSGM specimens are increased with increasing sintering temperature and VO5/2 concentration due to the enhanced sintering and mass transfer via the intergranular liquid phase. The 1 at.% VO5/2-doped LSGM specimen sintered at 1300 degrees C exhibits a high oxide ion conductivity of similar to 0.027 S cm(-1) at 700 degrees C over a wide range of oxygen partial pressure (P-O2 = 10(-27) - 1 atm), thereby demonstrating its potential as a useful electrolyte for anode-supported solid oxide fuel cells (SOFCs) without the requirement for any buffer layer between the electrolyte and anode. (C) 2010 Elsevier B.V. All rights reserved.
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