Abstract
The composite solid electrolytes, NaNO 3 dispersed with Al 2O 3, CeO 2, ZrO 2 and SiO 2 have been prepared by melt quenching method and investigated through XRD, DSC and electrical conductivity techniques. Typical increase in conductivity is about two orders of magnitude for 10 mol% of Al 2O 3 at 200 °C. The electronic transference number evaluated through dc polarization method was found out to be 1×10 −2 at 200 °C. The dependence of conductivity on concentration of dispersoids and particle size is in accordance with the space charge theory of conduction. The enhanced conductivity of NaNO 3 homogenously doped by Ca(NO 3) 2 was further enhanced by heterogeneous doping of Al 2O 3. By the contribution of these doping processes, the conductivity is enhanced by three orders of magnitude at 200 °C. The experimental and theoretically calculated values of conductivity using Maier's space charge layer model are in reasonable agreement.
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