Conductivity relaxation phenomena of the oxide ion conductor Zn2-2xTi1+xO4

Impedance measurements were carried out on the oxide ion conductor Zn2-3xTi 1+xO4 in the frequency range between 20 Hz and 10(6) Hz below 600 degreesC. The frequency dependence of the electric modulus M " shows the double peak shape in the cubic structure. These results art: different from the previo usly studied Zn2-x/2Ti1-xTaxO4 system where the single and double peaks hav e been observed for cubic and tetragonal phases, respectively. The M " prof ile of the present system was not significantly varied with the composition and activation energies could be obtained from both lower- and higher-freq uency peaks. The lower-frequency relaxation was supposed to be: related to the long-range ion hopping, since the activation energy obtained from the l ower frequency peak is close to that from the conductivity (C) 2000 Elsevie r Science B.V. All rights reserved.