Abstract
Composite materials (1 − f) CaWO4 – fSiO2 with volume fraction of SiO2f ≤ 1.0 were prepared by the solid state method. The obtained composites have been examined by SEM-EDS, the electrochemical impedance technique, conductivity measurements versus oxygen partial pressure and EMF measurements in order to evaluate ion transport numbers. It was shown that heterogeneous doping of the poor oxygen ion conductor CaWO4 with nano-SiO2 even at low concentration (f < 0.03) leads to an increase in ionic conductivity of the composites by more than an order of magnitude. The enhancement of conductivity in this system was explained by an additional contribution of the interface regions formed between the host and nanoparticles of dispersoid. A general mixing rule was applied for the calculation of electric conductivity of the (1 − f)CaWO4 – fSiO2 composite as a function of SiO2 concentration. Theoretical dependences were analyzed and compared with the experimental results.
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