Conductivity relaxation phenomena of the oxide ion conductor Zn2-2xTi1+xO4
Abstract Impedance measurements were carried out on the oxide ion conductor Zn 2−2 x Ti 1+ x O 4 in the frequency range between 20 Hz and 10 6 Hz below 600°C. The frequency dependence of the electric modulus M ″ shows the double peak shape in the cubic structure. These results are different from the previously studied Zn 2− x /2 Ti 1− x Ta x O 4 system where the single and double peaks have been observed for cubic and tetragonal phases, respectively. The M ″ profile of the present system was not significantly varied with the composition and activation energies could be obtained from both lower- and higher-frequency peaks. The lower-frequency relaxation was supposed to be related to the long-range ion hopping, since the activation energy obtained from the lower frequency peak is close to that from the conductivity