Electrical conduction mechanism of LaNixMe1-xO3-δ (Me = Fe, Mn)

Eiki Niwa, Hiroki Maeda, Chie Uematsu, Takuya Hashimoto

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Abstract Electrical conduction mechanism of LaNixFe1-xO3-δ and LaNixMn1-xO3+δ expected as Sr-free new cathode material for solid oxide fuel cells was analyzed. Electrical conduction behaviors of both specimens could be well fitted by small polaron hopping conduction model. The electrical conductivity of LaNixFe1-xO3-δ increased with increasing Ni content, showing agreement with decrease of activation energy for hopping conduction. The decrease of electrical conductivity and increase of activation energy of LaNixMn1-xO3+δ were observed with increasing Ni content for 0.0 ≤ x ≤ 0.4. Further Ni substitution increased electrical conductivity and decreased activation energy for 0.4 ≤ x ≤ 0.6. It was revealed using iodometry that the difference of hole carrier density between LaNixFe1-xO3-δ and LaNixMn1-xO3+δ was small. It was suspected that the origin of the difference of electrical conduction behavior of LaNixFe1-xO3-δ and LaNixMn1-xO3+δ was 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
Article number8187
Pages (from-to)241-247
Number of pages7
JournalMaterials Research Bulletin
Volume70
DOIs
Publication statusPublished - Oct 1 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Electrical conduction mechanism of LaNi<sub>x</sub>Me<sub>1-x</sub>O<sub>3-δ</sub> (Me = Fe, Mn)'. Together they form a unique fingerprint.

Cite this