Conductivity and electrical modulus studies of La 2-x Nd x Mo 1.7 W 0.3 O 9-δ oxygen ion conductor

Lakhinath Borah, Biswajit Paik, S. A. Hashmi, A. Pandey

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    La 2-x Nd x Mo 1. 7 W 0. 3 O 9-δ (x = 0 - 0. 5) and, for comparison, La 2 Mo 2 O 9 compounds have been synthesized following solid state reaction technique. Temperature-dependent electrical conductivity of La 2-x Nd x Mo 1. 7 W 0. 3 O 9-δ reveals suppression of the phase transition as compared to parent La 2 Mo 2 O 9 compound. Partial substitution of Nd at the La site of La 2 Mo 1. 7 W 0. 3 O 9-δ increases the conductivity of La 2 Mo 1. 7 W 0. 3 O 9-δ in the entire temperature regime. In the intermediate temperature region (405 °C ≤ T ≤ 570 °C), the overall conductivity of La 2-x Nd x Mo 1. 7 W 0. 3 O 9-δ (0. 1 ≤ x ≤ 0. 5) is higher than that of the parent compound, and the conductivity of the compound with x = 0. 1 is almost same with the La 2 Mo 2 O 9 in the high temperature region (T ≥ 640 °C). Arrhenius to Vogel-Tamman-Fulcher (VTF) transition is observed in all doped specimens above 460 °C. Ion relaxation mechanism has been discussed in the framework of electrical modulus analysis in the temperature range RT-530 °C and is found to be non-Debye type of conductivity relaxation with the distribution of transition rates for hopping ions in the range of 0. 60-0. 70.

    Original languageEnglish
    Pages (from-to)747-757
    Number of pages11
    JournalIonics
    Volume18
    Issue number8
    DOIs
    Publication statusPublished - 2012 Sep 1

    Keywords

    • Doping
    • Electrical modulus
    • Impedance spectroscopy
    • Ionic conduction

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Materials Science(all)
    • Engineering(all)
    • Physics and Astronomy(all)

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