DIELECTRIC INVESTIGATIONS OF BARIUM TITANATE DOPED WITH DEFERENT CONCENTRATION OF LANTHANUM OR ANTIMONY

Abstract

The dielectric properties of barium titanate doped with different concentration lanthanum or antimony are investigated. There are samples with 0.3 mol%, 0.5 mol% lanthanum and 0.1 mol%, 0.5 mol% antimony concentrations. All samples were prepared by Pechini procedure. Dielectric measurements in the temperature range of 170 K to 420 K and frequency range of I kHz to I MHz show three phase transitions, which temperatures matches those of bulk barium titanate. Curie temperature shifts to the lower temperatufe when lanthanum or antimony concentration grows. At low frequencies, the samples present conductivity Conduction-free loss spectra are calculated using a compact solution of the Kramers-Kronig transformation and an approximation based.