Effect of Strontium-Doped Lanthanum Vanadate on Crystal Structure, Conductivity and Vanadium Valence State of a La1−xSrxVO3Anode in a Reducing Environment

Chi Yang Liu, Shu Yi Tsai, Chung Ta Ni, Kuan Zong Fung

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

La1−xSrxVO3(where x = 0, 0.1, 0.3, 0.5, 0.7, and 1) exhibits a transition from an antiferromagnetic insulator to a paramagnetic metallic conductor and has been synthesized as a potential anode material for solid oxide fuel cells (SOFCs). La1−xSrxVO3was synthesized by a solid-state reaction process followed by heat treatment under a reducing atmosphere (Ar:80/H2:20). X-ray diffraction (XRD) results indicate that LaVO3was substituted with various amounts of Sr2+in the cation sublattice. Pure LaVO3shows an orthorhombic structure. After Sr2+substitution, a more symmetrical cubic perovskite structure was obtained because the tolerance factor is close to 1. The valence state of the vanadium ions of the La1−xSrxVO3was further verified by x-ray photoelectron spectroscopy (XPS). According to the XPS results, when the lanthanum ion was substituted by a strontium ion, the negatively charged defect, SrLa’, was compensated for by changing the valence of vanadium from a trivalent to a tetravalent or pentavalent state. The dependence of conduction behavior of La1−xSrxVO3on the amount of Sr addition is discussed in terms of the hopping process with super/double exchange interaction and a charge transfer mechanism.

Original languageEnglish
Pages (from-to)2301-2308
Number of pages8
JournalJournal of Electronic Materials
Volume46
Issue number4
DOIs
Publication statusPublished - 2017 Apr 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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