JIA Li-ping, LI Cheng, CHANG Xiao-feng. Preparation and Characterization of La2Ni1-xFexO4+δ[J]. Development and Application of Materials, 2009, 24(3): 19-22. DOI: 10.19515/j.cnki.1003-1545.2009.03.006
Citation: JIA Li-ping, LI Cheng, CHANG Xiao-feng. Preparation and Characterization of La2Ni1-xFexO4+δ[J]. Development and Application of Materials, 2009, 24(3): 19-22. DOI: 10.19515/j.cnki.1003-1545.2009.03.006

Preparation and Characterization of La2Ni1-xFexO4+δ

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  • Received Date: November 10, 2008
  • Available Online: March 29, 2024
  • With nitrates and ethylene diamine tetra acetic acid (EDTA) as precursors, La2Ni1-xFexO4+δ powder was prepared by sol-gel method.XRD results indicate that the complex oxides have K2NiF4 structure.The iodometric titration was used to determine both the oxidation state of Ni/Fe ions and the oxygen nonstoichiometry in La2Ni1-xFexO4+δ.It has been found that the both mentioned above will increase with the increase of coefficient x.The oxygen nonstoichiometry reached at 0.2462 when x=0.2.FT-IR spectrums revealed that the induced Fe may strengthen the Ni-O bond asymmetric vibration, which facilitates the mobility of non-stoichiometric interstitial oxygen ion in the lattice.AC impedance spectroscopy measurements were used to study the ionic conductivity.The ionic conductivity increases with the increase of coefficient x.The changes of conductivity with temperature below 650℃ are in accordance with the conduction mechanism of small polarons.
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