A semi-empirical equation for oxygen nonstoichiometry of perovskite-type ceramics

Zhaohui Yang, Y. S. Lin

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


Explicit equations correlating oxygen nonstoichiometry to oxygen partial pressure and temperature are important for applications of perovskite-type ceramics as membranes, adsorbents and catalysts in various chemical reaction and separation processes. A semi-empirical equation for oxygen nonstoichiometry on perovskite-type ceramics is reported in this paper. Though derived from the results of a point defect model on a perovskite-type ceramic material, La0.1Sr0.9Co0.5Fe0.5O3-δ , this equation describes very well the experimentally measured oxygen nonstoichiometry data for two perovskite-type ceramics measured in this work and three perovskite-type ceramics reported in the literature. The major advantage of this semi-empirical equation lies in its simplicity, explicitness and accuracy. This equation is coupled with oxygen permeation equation to predict oxygen permeation current density through two perovskite-type ceramic membranes. The predicted data agree very well with the results reported in the literature using a complex defect reaction model.

Original languageEnglish (US)
Pages (from-to)245-254
Number of pages10
JournalSolid State Ionics
Issue number3-4
StatePublished - Oct 1 2002
Externally publishedYes


  • Oxygen nonstoichiometry
  • Perovskite-type ceramics
  • Semi-empirical equation

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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