Effect of Ho substitution on the ionic conductivity of La 2Mo 1.7W 0.3O 9 oxygen ion conductor

Lakhinath Borah, B. Paik, A. Pandey

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    Partial substitutions of Ho at the La-site of La 2Mo 1.7W 0.3O 9-δ were carried out. Compound La 2-xHo xMo 1.7W 0.3O 9-δ (x = 0, 0.05, 0.1, 0.15, 0.2, 0.3, 0.5) has been synthesized by solid state reaction technique. The specimens were characterized by XRD, SEM, DSC for crystal structure, surface morphology, phase transition and ac impedance spectroscopy for conductivity and other electrical parameter determination. Partial substitution of Ho at the La-site of La 2Mo 1.7W 0.3O 9-δ, increases the conductivity within the substitutional range, x ≤ 0.2. The phase transition of La 2Mo 2O 9 is suppressed in doped compound and a transition from Arrhenius to VTF behavior of temperature dependence of conductivity is observed around 500°C. The conductivity is found to be high in the intermediate temperature region and at high temperature the conductivity of La 2-xHo xMo 1.7W 0.3O 9-δ (0.05 ≤ x ≤ 0.2) is almost similar with that of La 2Mo 2O 9. The decrease in energy barrier enhances the thermally assisted process to start at lower temperature.

    Original languageEnglish
    Pages (from-to)387-393
    Number of pages7
    JournalSolid State Sciences
    Volume14
    Issue number3
    DOIs
    Publication statusPublished - 2012 Mar 1

    Keywords

    • Doping
    • Impedance spectroscopy
    • Ionic conduction
    • La Mo O
    • Phase transition

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics

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