Effect of NiO sintering-aid on hydration kinetics and defect-chemical parameters of BaZr0.8Y0.2O3 - Δ

E. Kim, Y. Yamazaki, S. M. Haile, H. I. Yoo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The influence of NiO, used as a sintering aid, on the transport properties of BaZr0.8Y0.2O3 - Δ was investigated by monitoring electrical conductivity relaxation of specimens with and without NiO during hydration in atmospheres of different oxygen activities at 700 and 800 °C. The chemical diffusivities of H and O governing the kinetics were precisely evaluated from the transient conductivity, and all the defect-chemical parameters - the two external equilibrium constants and mobilities of all the carriers, VO · ·, Hi · and h· - were determined from the steady-state equilibrium conductivity. It is found that the processing benefits afforded by NiO are accompanied by a significant reduction in ionic mobilities and hydration reaction constant. These factors, in turn, result in a smaller electrolytic regime in the presence of NiO than when it is absent.

Original languageEnglish (US)
Pages (from-to)23-28
Number of pages6
JournalSolid State Ionics
StatePublished - Jul 1 2015


  • BaZrO
  • Carrier mobility
  • Electrolytic domain
  • Hydration kinetics
  • NiO sintering aid
  • Proton conductors

ASJC Scopus subject areas

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


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