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

Zhaohui Yang, Y. S. Lin

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

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
Volume150
Issue number3-4
DOIs
StatePublished - Oct 2002
Externally publishedYes

Fingerprint

semiempirical equations
Perovskite
ceramics
Oxygen
oxygen
Permeation
membranes
Ceramic membranes
Point defects
Ceramic materials
adsorbents
Partial pressure
Adsorbents
point defects
partial pressure
perovskite
Chemical reactions
chemical reactions
Current density
current density

Keywords

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

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

A semi-empirical equation for oxygen nonstoichiometry of perovskite-type ceramics. / Yang, Zhaohui; Lin, Y. S.

In: Solid State Ionics, Vol. 150, No. 3-4, 10.2002, p. 245-254.

Research output: Contribution to journalArticle

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