Abstract
Electrical properties of rutile-type Fe0.9 W0.1TiMO6 (M = Ta,Nb) ceramics were studied. The results are compared to those observed previously on rutile-type relaxor ferroelectric-like FeTiMO6 and Fe0.9 W0.05TiMO6 (M = Ta,Nb) ceramics. In part high dielectric constant ε(ω) (ω is angular frequency) is observed at ≈ 500–600 K, with peak ε(ω) up to ≈ 2.3 × 104 for the frequency of 162 Hz (Ag-paint contacts), decreasing with rising frequency. Some quantities might also be of interest in terms of solid oxide fuel cell anode materials for which similar rutile-type oxide solid solutions were proposed in the literature. Apart from the study of ε(ω), the electrical response is analysed by measuring DC conductivity σDC, AC conductivity σAC(ω), losses ε”(ω) and dissipation factor tan δ, using impedance spectroscopy. For both compounds, the temperature dependence of bulk σDC shows Arrhenius behavior with activation energy of EA ≈ 0.2–0.35 eV and σDC(295 K) ≈ 10−3–10−5 Ω−1 cm−1 depending on preparation conditions and composition; grain boundaries exhibit slightly higher EA, the values of σDC are a factor of up to ≈ 10 lower at all temperatures. From σAC(ω) data, a power law frequency dependence of conductivity by grain boundaries is derived in some instances. Relaxation processes are established from ε”(ω) and tan δ data. Thermopower data reveal different bulk conduction mechanisms for samples prepared in air or reducing atmosphere. Eventual microstructural local inhomogeneities and possible mixed valences Fe2+/Fe3+ are analysed by means of 57Fe Mössbauer spectroscopy.
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The authors are indebted to Ms. M. John for assistance in X-ray diffraction analysis.
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Fehr, K.T., Günther, A., Hochleitner, R. et al. Electrical properties, thermopower and Mössbauer spectroscopy of rutile-type relaxor ferroelectric-like Fe0.9 W0.1TiMO6 (M = Ta,Nb) ceramics. J Electroceram 34, 262–274 (2015). https://doi.org/10.1007/s10832-014-9979-0
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DOI: https://doi.org/10.1007/s10832-014-9979-0