Oxygen nonstoichiometry and transport properties of LaNi0.6Co0.4O3−δ

R. A. Budiman, Y. Uzumaki, H. J. Hong, T. Miyazaki, S. Hashimoto, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The oxygen nonstoichiometry of the perovskite-type oxide, LaNi0.6Co0.4O3−δ, was measured at various temperatures and oxygen partial pressures (p(O2)) by high temperature gravimetry and coulometric titration. The oxygen nonstoichiometry appeared independent of p(O2) in the range of 10− 4 bar > p(O2), which was in good agreement with the tendency of lattice parameter determined by the high-temperature X-ray diffraction (HT-XRD). The oxygen nonstoichiometry behavior was analyzed using the defect equilibrium model assuming delocalized electron. In addition, the diffusion coefficient, D*, and the surface reaction rate constant, k*, were obtained by the isotope exchange and secondary ion mass spectrometry. The Dv estimated from the D* showed similarity with those reported for other perovskite oxides which supported the reliability of δ determined in this work.

Original languageEnglish
Pages (from-to)52-58
Number of pages7
JournalSolid State Ionics
Volume292
DOIs
Publication statusPublished - 2016

Keywords

  • Defect chemical
  • Diffusion coefficient
  • Oxygen nonstoichiometry

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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