The effects of La on the dielectric properties of lead iron tungstate Pb(Fe2/3W1/3)O-3 relaxer ceramics

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La doped samples were used to study the effects of this dopant on the structural and dielectric properties of Pb(Fe2/3W1/3)O3(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, PbWO4. A decrease of dielectric permittivity maximum,εrmax, a shift of transition temperature,T0, 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.
Original languageUnknown
Pages (from-to)1035-1041
JournalJournal of the European Ceramic Society
Issue number8
Publication statusPublished - 1 Jan 2000

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