Structural and electrical characterization of iron and lithium co-doped barium strontium titanate composite

This communication reports the effect of Iron (Fe) and Lithium (Li) co-doping on the structural, dielectric and electrical properties of Ba0.8Sr0.2TiO3; i.e. (Fe0.5Li0.5)(0.1)Ba0.7Sr0.2TiO3 (FLBST). The FLBST composite was synthesized by the solid-state mixed oxide method at 1400 degrees C for 12h. The crystalline phase formation has been confirmed by the X-ray diffraction technique and analyzed through the Rietveld Analysis using X'Pert Highscore plus software. From the XRD analysis, lattice parameters and the average crystallite size was calculated. The electrical properties of sintered (at 1450 degrees C for 2h) pellets were carried out in the temperature range of 30 degrees C-350 degrees C using impedance spectroscopy. Based on the real and imaginary part of the dielectric constant, i) the dipolar contribution which is dominant in 30 degrees C-150 degrees C is characterized by Curie-Weiss law and ii) contribution from defects and oxygen vacancies seen beyond 150 degrees C is described by Arrhenius equation.