Fe doping effects on phase stability and conductivity of La sub(0.75Sr) sub(0).25Ga sub(0.8Mg) sub(0).2O sub(3-[delta])

The effects of Fe doping on phase stability and electrical conductivity were investigated for the 25 mol% Sr and 20 mol% Mg-doped lanthanum gallates (LSGM-2520). While secondary phases, in addition to perovskite phase, were formed for an undoped LSGM-2520 in accordance with previous reports, a singl...

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Bibliographic Details
Published in:Journal of power sources 2009-09, Vol.193 (2), p.593-597
Main Authors: Yoo, Jin Seong, Lee, Shiwoo, Yu, Ji Haeng, Woo, Sang Kuk, Park, Hun, Kim, Ho Gi
Format: Article
Language:English
Subjects:
Doping
Gallates
Iron
Neutron diffraction
Partial pressure
Perovskites
Phase stability
Resistivity
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Summary:The effects of Fe doping on phase stability and electrical conductivity were investigated for the 25 mol% Sr and 20 mol% Mg-doped lanthanum gallates (LSGM-2520). While secondary phases, in addition to perovskite phase, were formed for an undoped LSGM-2520 in accordance with previous reports, a single phase perovskite phase was obtained by addition of a small amount ([not, vert, similar]4 mol%) of Fe to LSGM-2520. The conductivity of 4 mol% Fe-doped LSGM-2520 was as high as 0.17 S cm[super]-1 at 800 [deg]C and it was confirmed to be ionic based on its dependency on oxygen partial pressures. Crystallographic analysis using neutron diffraction and electron diffraction determined the crystal structure and lattice parameters for 4 mol% Fe-doped LSGM-2520.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2009.04.025