High-temperature electrical conductivity and point defects in lead zirconate-titanate

The electrical conductivity and thermoelectric power of lead zitconate-titanate Pb(Ti0.47Zr0.53)O3 (PZT) have been studied at temperatures up to 1000°C in gaseous ambients with controlled partial pressures of both volatile components: lead oxide and oxygen. The experimental results show the small polaron conduction mechanism in PZT. The predominant point defects, as obtained from the oxygen pressure dependences of the conductivity and thermopower, are fully ionized vacancies of lead and oxygen with almost equal concentrations: [image omitted]