Analysis of electrical conduction mechanism of LaNi1-xMe xO3-δ (Me = Fe, Mn)

Eiki Niwa; Hiroki Maeda; Chie Uematsu; Takuya Hashimoto

doi:10.1149/05027.0117ecst

Analysis of electrical conduction mechanism of LaNi_1-xMe _xO_3-δ (Me = Fe, Mn)

Eiki Niwa, Hiroki Maeda, Chie Uematsu, Takuya Hashimoto

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

3 Citations (Scopus)

Abstract

Electrical conduction mechanism of LaNi_1-xFe_xO _3-δ and LaNi_1-xMn_xO_3+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-xFe_xO_3-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 LaNi_1-xMn_xO_3+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 LaNi_1-xFe_xO _3-δ and LaNi_1-xMn_xO_3+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.

Original language	English
Title of host publication	Solid State Ionic Devices 9 - Ion Conducting Thin Films and Multilayers
Pages	117-124
Number of pages	8
Edition	27
DOIs	https://doi.org/10.1149/05027.0117ecst
Publication status	Published - 2012
Externally published	Yes
Event	9th Solid State Ionic Devices Sympsoium - 22nd ECS Meeting - Honolulu, HI, United States Duration: Oct 7 2012 → Oct 12 2012

Publication series

Name	ECS Transactions
Number	27
Volume	50
ISSN (Print)	1938-5862
ISSN (Electronic)	1938-6737

Other

Other	9th Solid State Ionic Devices Sympsoium - 22nd ECS Meeting
Country	United States
City	Honolulu, HI
Period	10/7/12 → 10/12/12

All Science Journal Classification (ASJC) codes

Engineering(all)

Access to Document

10.1149/05027.0117ecst

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Niwa, E, Maeda, H, Uematsu, C & Hashimoto, T 2012, Analysis of electrical conduction mechanism of LaNi_1-xMe _xO_3-δ (Me = Fe, Mn). in Solid State Ionic Devices 9 - Ion Conducting Thin Films and Multilayers. 27 edn, ECS Transactions, no. 27, vol. 50, pp. 117-124, 9th Solid State Ionic Devices Sympsoium - 22nd ECS Meeting, Honolulu, HI, United States, 10/7/12. https://doi.org/10.1149/05027.0117ecst

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abstract = "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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AU - Hashimoto, Takuya

PY - 2012

Y1 - 2012

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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