TY - GEN
T1 - Analysis of electrical conduction mechanism of LaNi1-xMe xO3-δ (Me = Fe, Mn)
AU - Niwa, Eiki
AU - Maeda, Hiroki
AU - Uematsu, Chie
AU - Hashimoto, Takuya
PY - 2013
Y1 - 2013
N2 - Electrical conduction mechanism of LaNi1-xFexO 3-δ and LaNi1-xMnxO3+δ, which are expected as Sr-free new cathode material for solid oxide fuel cells, was analyzed using electrical conductivity measurements at high temperatures. Electrical conduction behaviors of both specimens can be well fitted into small polaron hopping conduction model. The electrical conductivity of LaNi 1-xFexO3-δ increased with increasing Ni content, showing agreement with decrease of activation energy for hopping conduction. Almost constant activation energy irrespective of sintering temperature indicated that observed activation energy can be attributed to intraparticle conduction. The decrease of electrical conductivity and increase of activation energy of LaNi1-xMnxO3+δ were observed with increasing Ni content for 0.6≥x≥1.0. Further Ni substitution increased electrical conductivity and decreased activation energy for 0.4≥x≥0.6. It can be suspected that the origin of the difference of electrical conduction behavior of LaNi1-xFexO 3-δ and LaNi1-xMnxO3+δ is difference of energy level of eg band composed of Fe 3d or Mn 3d orbitals and their overlapping quantity with O 2p and Ni 3d band.
AB - Electrical conduction mechanism of LaNi1-xFexO 3-δ and LaNi1-xMnxO3+δ, which are expected as Sr-free new cathode material for solid oxide fuel cells, was analyzed using electrical conductivity measurements at high temperatures. Electrical conduction behaviors of both specimens can be well fitted into small polaron hopping conduction model. The electrical conductivity of LaNi 1-xFexO3-δ increased with increasing Ni content, showing agreement with decrease of activation energy for hopping conduction. Almost constant activation energy irrespective of sintering temperature indicated that observed activation energy can be attributed to intraparticle conduction. The decrease of electrical conductivity and increase of activation energy of LaNi1-xMnxO3+δ were observed with increasing Ni content for 0.6≥x≥1.0. Further Ni substitution increased electrical conductivity and decreased activation energy for 0.4≥x≥0.6. It can be suspected that the origin of the difference of electrical conduction behavior of LaNi1-xFexO 3-δ and LaNi1-xMnxO3+δ is difference of energy level of eg band composed of Fe 3d or Mn 3d orbitals and their overlapping quantity with O 2p and Ni 3d band.
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U2 - 10.1149/05027.0117ecst
DO - 10.1149/05027.0117ecst
M3 - Conference contribution
AN - SCOPUS:84885722486
SN - 9781607684152
T3 - ECS Transactions
SP - 117
EP - 124
BT - Solid State Ionic Devices 9 - Ion Conducting Thin Films and Multilayers
PB - Electrochemical Society Inc.
T2 - 9th Solid State Ionic Devices Sympsoium - 22nd ECS Meeting
Y2 - 7 October 2012 through 12 October 2012
ER -