Ionic conductivity of nanophases of 4% and 9.5 yttria doped zirconia YSZ were studied using impedance spectroscopy technique. In this study our aim is to find optimal conditions for any improvement of ionic conductivity at low temperature. Experimental results show that ionic conductivity of nanosized YSZ with 4% mol is higher than for single crystal YSZ with 9.5% mol and this for the most part of temperature domain studied (300-500C). For nanocomposite with 2 % mol Al2O3, we found that an light increase of ionic conductivity even at low temperatures. This work has shown that conductivity in these materials depends not only on concentration in alumina but also of microstructure. Comparing with N9, the nanocomposite NC2 with 2 % mol Al2O3 gives the highest conductivity in grain and not in grain boundary.

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