Relationship between local structure and oxide ionic diffusion of Nd2NiO4+δ with K2NiF4 structure

Toshiaki Ina, Yuki Orikasa, Titus Masese, Takayuki Nakao, Atsushi Mineshige, Koji Amezawa, Hajime Tanida, Tomoya Uruga, Yoshiharu Uchimoto

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The relationship between the local structure and oxide ionic conduction of Nd2NiO4+δ possessing the K2NiF4 structure was investigated. Various oxygen nonstoichiometry samples of Nd2NiO4+δ prepared with different annealing oxygen partial pressures were examined. The local structure related to oxide ionic conduction was determined by the Nd K-edge extended X-ray absorption fine structure. The oxide ionic conductivity and surface exchange coefficient were estimated using electronic conductivity relaxation methods. The activation energy for the oxide ionic conductivity was found to have a direct correlation to the surface exchange coefficient. The bottleneck size for oxide ion conduction was strongly correlated to the oxide ionic conduction of interstitial oxygen and the oxygen surface exchange rate.

Original languageEnglish
Pages (from-to)875-879
Number of pages5
JournalElectrochemistry
Volume82
Issue number10
DOIs
Publication statusPublished - 2014

Keywords

  • Extended x-ray absorption fine structure
  • Local structure
  • NdNiO
  • Oxide ion conduction

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