Materials synthesis, electrochemical characterization and oxygen permeation properties of Fe-doped BaZrO3

作者：Zhang Haomiao; Suresh Aravind; Carter C B; Wilhite B A^*

来源：Solid State Ionics, 2014, 266: 58-67.

DOI：10.1016/j.ssi.2014.08.011

• Ba0.90Zr0.90Fe0.10O3-delta (BZF10)
• Mixed Ionic-electronic conductor
• Electrical conductivity relaxation (ECR)
• Electrochemical impedance spectroscopy (EIS)
• Oxygen permeation

This paper reports the synthesis, materials characterization, electrochemical and transport properties under O-2-environments of an iron-doped barium zirconate perovskite (Ba0.90Fe0.10Zr0.90O3-delta BZF10), a mixed ionic-electronic conductor (MIEC). BZF10 powder was synthesized by solid-state reaction of the binary oxides and characterized using synchrotron X-ray diffraction (XRD). Analysis of the XRD patterns indicated the presence in the powder of a primary cubic perovskite phase with a lattice parameter 4.19 angstrom. The actual composition of the powder was measured using proton induced X-ray emission (PIXE). The powder was pressed and sintered into pellets and the fracture cross-section was then investigated by transmission electron microscopy (TEM). TEM analysis indicates a polycrystalline structure and the electron-diffraction pattern confirms the XRD results. The pellets, with attached electrodes, were investigated for electrochemical activity under dry oxidizing atmosphere using a combination of electrical conductivity relaxation (ECR) and electrochemical impedance spectroscopy (EIS) in the range of 600-800 degrees C and oxygen permeability between 600-900 degrees C. ECR indicates that both the chemical diffusion coefficient D-V and the surface kinetic parameter k%26apos; increase with increasing pO(2). EIS suggests a primarily p-type semiconduction behavior explaining the dependence of electrical conductivity upon oxygen partial pressure. Separate gas permeation measurements confirm an oxygen permeability of 4.11 x 10(-11) mol/(m. s . Pa). BZF10 materials showed superior stability during the whole study (%26gt;1000 h on stream).

• 出版日期2014-11-15