Low-temperature sintering and electrical properties of strontium- and magnesium-doped lanthanum gallate with V2O5 additive
- Low-temperature sintering and electrical properties of strontium- and magnesium-doped lanthanum gallate with V2O5 additive
- 하상부; 조윤호; 지호일; 이종호; 강윤찬; 이종흔
- SOFC; LSGM; sintering additive; Strontium- and magnesium-doped; lanthanum gallate; Solid oxide fuel cell; Vanadium oxide; Phase purity; Oxide ion conductivity
- Issue Date
- Journal of power sources
- VOL 196, NO 6, 2971-2978
- 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.
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