Structure and conductivity of rutile niobium iron titanate

Peter I Cowin, Christophe TG Petit, Rong Lan, Carl J Schaschke, Shanwen Tao

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    The structure and electrical conductivity of the solid solution FexTi1 − 2xNbxO2-δ (x = 0.1, 0.2, 0.3) have been investigated. A solid solution with the rutile structure is observed, along with an increase in unit cell volume with increasing substitution. The conductivity in 5% H2/Ar reduced with increasing doping levels, reaching a maximum of 2.67 S cm− 1 at 700 °C for Fe0.1Ti0.8Nb0.1O2-δ. None of the compounds in this series were redox stable at 700 °C in 5% H2/Ar, with increasing amounts of a haematite secondary phase observed with increased doping levels. Reduction at 900 °C in 5% H2/Ar caused a significant increase in conductivity (8.34 S cm− 1 in 5%H2/Ar) at 700 °C, suggesting that only partial reduction occurs at lower temperatures. The lack of redox stability and relatively low conductivities of these materials makes them unsuitable as a component of composite anode for IT-SOFC.
    Original languageEnglish
    Pages (from-to)48-53
    Number of pages6
    JournalSolid State Ionics
    Volume236
    Early online date6 Mar 2013
    DOIs
    Publication statusPublished - 1 Apr 2013

    Keywords

    • Conductivity
    • Rutile
    • Iron niobium titanate
    • Anode
    • Solid oxide fuel cell

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