TY - JOUR
T1 - Improved oxide ion conductivity of Co doped La0.8Sr0.2Ga0.8Mg0.2O3 perovskite type oxide
AU - Ishihara, Tatsumi
AU - Akbay, Taner
AU - Furutani, Haruyoshi
AU - Takita, Yusaku
N1 - Funding Information:
The authors acknowledge the financial support from the Kajima Research Foundation. Part of this study has been carried out as a research project sponsored by the Japan Petroleum Institute commissioned by the Petroleum Energy Center with the support of Ministry of International Trade and Industry. The SIMS measurement was performed in the National Institute of Materials and Chemical Research and the authors are grateful for the assistance of Dr. N. Sakai for all SIMS measurements.
PY - 1998/12/1
Y1 - 1998/12/1
N2 - Effects of doping certain transition metal cations for the Ga site on the oxide ion conductivity of La0.8Sr0.2Ga0.8Mg0.2O3 has been investigated in detail. It was found that doping with Co is effective for enhancing the oxide ion conductivity. In particular, a significant increase at low temperature was observed. Electrical conduction can generally be improved by doping transition metal cations, however, the theoretical emf was almost exhibited in an H2-O2 cell utilizing Co doped La0.8Sr0.2Ga0.8Mg0.2O3 for Co concentrations lower than 10 mol% on the Ga site. Diffusion characteristics of the oxide ion in La0.8Sr0.2Ga0.8Mg0.5Co0.085O 3 has also been investigated by using the 18O tracer method. Since the diffusion coefficient measured by the 18O tracer method is almost the same as that the one estimated via electrical conductivity measurements, it was concluded that the conduction of La0.8Sr0.2Ga0.8Mg0.115Co 0.085O3 is almost ionic. It seems most likely that the improved oxide ion conductivity by doping with Co is brought about by the enhanced mobility of the oxide ions.
AB - Effects of doping certain transition metal cations for the Ga site on the oxide ion conductivity of La0.8Sr0.2Ga0.8Mg0.2O3 has been investigated in detail. It was found that doping with Co is effective for enhancing the oxide ion conductivity. In particular, a significant increase at low temperature was observed. Electrical conduction can generally be improved by doping transition metal cations, however, the theoretical emf was almost exhibited in an H2-O2 cell utilizing Co doped La0.8Sr0.2Ga0.8Mg0.2O3 for Co concentrations lower than 10 mol% on the Ga site. Diffusion characteristics of the oxide ion in La0.8Sr0.2Ga0.8Mg0.5Co0.085O 3 has also been investigated by using the 18O tracer method. Since the diffusion coefficient measured by the 18O tracer method is almost the same as that the one estimated via electrical conductivity measurements, it was concluded that the conduction of La0.8Sr0.2Ga0.8Mg0.115Co 0.085O3 is almost ionic. It seems most likely that the improved oxide ion conductivity by doping with Co is brought about by the enhanced mobility of the oxide ions.
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U2 - 10.1016/s0167-2738(98)00325-7
DO - 10.1016/s0167-2738(98)00325-7
M3 - Article
AN - SCOPUS:0032312788
SN - 0167-2738
VL - 113-115
SP - 585
EP - 591
JO - Solid State Ionics
JF - Solid State Ionics
ER -