Pb(Fe2/3W1/3)O3 by mechanical activation of coprecipitated Pb3Fe2O6 and WO3

Abstract

Single phase Pb(Fe2/3W1/3)O3 (PFW) of perovskite structure was synthesized by mechanically activating a mixture of coprecipitated Pb3Fe2O6 and WO3 at room temperature for 5 h. Five hours of mechanical activation led to PFW particles of 20-30 nm in size with a rounded particle morphology. The perovskite PFW phase derived from mechanical activation is stable against rising temperature and remains as the main crystalline phase up to the sintering temperature of 870 °C. The sintered density of PFW thus derived increases with increasing activation time and sintering temperature. A maximum sintered density of 98.5% theoretical density is obtained when the activation-derived PFW powder is sintered at 870 °C. It exhibits a maximum dielectric permittivity of ∼9000 and a Curie temperature of -97 °C when measured at 10 kHz. © 2002 Elsevier Science B.V. All rights reserved.