The electrical conductivity behaviour in the para-electric state was investigated in

lanthanum modified lead zirconate titanate ceramics, considering the universal

relaxation law. The contribution of conductive processes to the dielectric response

for the low-frequency range was discussed taking into account the oxygen

vacancies mechanism. The activation energies for the thermally hopping and

conductivity processes were obtained. The results for the frequency dependence of

the conductivity suggested at the oxygen vacancy hopping processes, due to

relaxations in oxygen vacancy-related dipoles, being mainly responsible for the

conduction behaviour in the studied system.

Ionized Oxygen Vacancy-Related Electrical Conductivity in

(Pb1−xLax)(Zr0.90Ti0.10)1−x/4O3 Ceramics. A.Peláiz-Barranco, J.D.S.Guerra, R.López-

Noda, E.B.Araújo: Journal of Physics D, 2008, 41[21], 215503