Defect chemistry and oxygen permeation property of Pr2Ni0.75Cu0.25O4 oxide doped with Ga

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Abstract

Mixed conductivity and oxygen permeation property in Pr2Ni0.75Cu0.25Ga0.05O4 were investigated. After examining various Ga concentrations, it was found that cation excess composition of Pr2Ni0.75Cu0.25Ga0.05O4 achieved the highest oxygen permeability of 298 μmol·min- 1·cm- 2 (6.68cc·min- 1·cm- 2) at 1273 K from air to He with a 0.5 mm thickness. The oxygen permeability of Pr2Ni0.75Cu0.25Ga0.05O4 increased with increasing the activity of surface catalyst and the highest permeation was achieved when La0.9Sr0.1Co0.8Fe0.2O3 was used for the surface catalyst. The oxygen nonstoichiometry was further studied by using thermogravimetry. It was confirmed that the excess amount of oxygen was introduced at high PO2 range, which might be the origin of the high oxygen permeation rate in this oxide.

Original languageEnglish
Pages (from-to)1367-1371
Number of pages5
JournalSolid State Ionics
Volume179
Issue number27-32
DOIs
Publication statusPublished - Sep 30 2008

All Science Journal Classification (ASJC) codes

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

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