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- Title
Effect of Strontium-Doped Lanthanum Vanadate on Crystal Structure, Conductivity and Vanadium Valence State of a LaSrVO Anode in a Reducing Environment.
- Authors
Liu, Chi-Yang; Tsai, Shu-Yi; Ni, Chung-Ta; Fung, Kuan-Zong
- Abstract
LaSrVO (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). LaSrVO was synthesized by a solid-state reaction process followed by heat treatment under a reducing atmosphere (Ar:80/H:20). X-ray diffraction (XRD) results indicate that LaVO was substituted with various amounts of Sr in the cation sublattice. Pure LaVO shows an orthorhombic structure. After Sr 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 LaSrVO was 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, Sr', was compensated for by changing the valence of vanadium from a trivalent to a tetravalent or pentavalent state. The dependence of conduction behavior of LaSrVO on the amount of Sr addition is discussed in terms of the hopping process with super/double exchange interaction and a charge transfer mechanism.
- Subjects
LANTHANUM compounds; TRANSITION metal compounds synthesis; VANADATES; SOLID oxide fuel cell electrodes; DOPED semiconductors; VANADIUM spectra; PHYSIOLOGICAL effects of strontium; CRYSTAL structure
- Publication
Journal of Electronic Materials, 2017, Vol 46, Issue 4, p2301
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-016-5268-9