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

Eiki Niwa, Hiroki Maeda, Chie Uematsu, Takuya Hashimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationSolid State Ionic Devices 9 - Ion Conducting Thin Films and Multilayers
Pages117-124
Number of pages8
Edition27
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event9th Solid State Ionic Devices Sympsoium - 22nd ECS Meeting - Honolulu, HI, United States
Duration: Oct 7 2012Oct 12 2012

Publication series

NameECS Transactions
Number27
Volume50
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other9th Solid State Ionic Devices Sympsoium - 22nd ECS Meeting
CountryUnited States
CityHonolulu, HI
Period10/7/1210/12/12

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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