Abstract
La doped samples were used to study the effects of this dopant on the structural and dielectric properties of Pb(Fe 2/3W 1/3)O 3 (PFW) relaxor ceramics. La doping leads to a decrease in the lattice constant of the cubic PFW perovskite and to the precipitation of increasing amounts of a second phase, PbWO 4. A decrease of dielectric permittivity maximum, ε rmax, a shift of transition temperature, T 0, to lower temperatures, and an increase of diffuseness, δ, are also observed. Undoped and La doped PFW show a p-type conduction. The resistivity vs La content shows a “V-like” curve. The aging behavior of the samples are also altered by the presence of the dopant. The aging decreases with increasing the La content up to 5 at% and increases after that. Charge compensation and defect associations in the La doped samples are discussed and suggested to explain the electrical properties and the aging behavior.
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