Impedance Studies of La2Mo2-xSnxO9-δ Oxide Ion Conductors

doi:10.1007/s40195-012-0273-3

Abstract

Abstract:

A series of compounds La₂Mo_2-xSn_xO_9-_δ(x=0-0.3) have been synthesized by solid-state reaction technique. Materials have been characterized by XRD, SEM, DSC and impedance study. In the temperature regime 520℃-590℃, the specimens with x≤0.05 have the conductivity higher than La₂Mo₂O₉. Conductivity of Sn-doped compound decreases consistently with increasing Sn-doping, compared to the undoped compound both below and above phase transition, barring the specimen with x≤0.05, where conductivity values remains almost same as that of undoped specimens in high temperature region. In the intermediate temperature regime (520℃-590℃), the conductivity of doped compounds increases for x≤0.05 as compared to parent compound. Also, there is no indication of phase stabilization with Sn-doping in this compound even with the highest doping level, x=0.3. Electric modulus analysis suggests that thermally activated oxygen ion hopping mechanism is responsible for the conduction in Sn-doped compound.

Key words: Ionic conduction, La₂Mo₂O₉, Oxide ion conductor, Impedance spectroscopy, Electric modulus

Lakhi Nath Borah, A. Pandey. Impedance Studies of La₂Mo_2-xSn_xO_9-δ Oxide Ion Conductors[J]. Acta Metallurgica Sinica (English Letters), 2013, 26(4): 425-434.

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Impedance Studies of La₂Mo_2-xSn_xO_9-δ Oxide Ion Conductors

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