Low-temperature sintering and electrical properties of strontium- and magnesium-doped lanthanum gallate with V2O5 additive

Title
Low-temperature sintering and electrical properties of strontium- and magnesium-doped lanthanum gallate with V2O5 additive
Authors
하상부조윤호지호일이종호강윤찬이종흔
Keywords
SOFC; LSGM; sintering additive; Strontium- and magnesium-doped; lanthanum gallate; Solid oxide fuel cell; Vanadium oxide; Phase purity; Oxide ion conductivity
Issue Date
2011-03
Publisher
Journal of power sources
Citation
VOL 196, NO 6, 2971-2978
Abstract
The effects of a V2O5 additive on the low-temperature sintering and ionic conductivity of strontiumand 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 ℃ 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 ℃ exhibits a high oxide ion conductivity of ∼0.027 S cm−1 at 700 ℃ over a wide range of oxygen partial pressure (PO2 = 10−27 − 1 atm), thereby demonstrating its potential as a useful electrolyte for anodesupported solid oxide fuel cells (SOFCs) without the requirement for any buffer layer between the electrolyte and anode.
URI
http://pubs.kist.re.kr/handle/201004/39336
ISSN
0378-7753
Appears in Collections:
KIST Publication > Article
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