Effect of pH on synthesis and properties of perovskite oxide via a citrate process

Zhentao Wu, Wei Zhou, Wanqin Jin, Nanping Xu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A series of La0.6Sr0.4Co0.4Fe 0.6O3-δ (LSCF) perovskite-type oxides were synthesized using a modified citrate process under various pH conditions (pH = 1, 3, 5, 7, and 9, respectively). The effect of pH on the chelate process, crystal development, morphology, and oxygen permeability of LSCF oxides were investigated. FT-IR analysis showed that the chelate processes for pH = 1 and 3 were different from those for pH = 5, 7, and 9. XRD and SEM observations revealed that the crystal formation and morphology of LSCF oxides were dependent on the precursors with different pH conditions. The LSCF membranes derived from the precursors with lower pH values (pH = 1 and 3) exhibited larger apparent activation energy for oxygen permeation than the other samples (pH = 5, 7, and 9) in the range of 1073-1123K. This study indicated that properties such as crystallinity and oxygen permeability of LSCF oxide could be tailored by controlling the pH values in the synthesis process.

Original languageEnglish
Pages (from-to)769-776
Number of pages8
JournalAIChE Journal
Issue number2
Publication statusPublished - 1 Feb 2006


  • Citrate process
  • Oxygen permeability
  • Perovskite-type oxides
  • pH
  • Synthesis


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