Assessment of barium ferrite obtained by sol-gel and laser floating zone methods as energy storage material

Abstract

This work assesses the synthesis effect on barium ferrite (BaFe2O4) by sol-gel (SG), using powdered coconut water as a precursor, and then heat treated (HT) between 700 and 1200 ºC and by the laser floating zone (LFZ) methods with pulling rates of 10, 50 and 100 mm/h. BaFe2O4 phase was detected in all samples, with no secondary phases, regardless of the preparation conditions. The samples most promising for energy storage, with high dielectric constant and low losses, at 300 K and 100 Hz, were the HT sample at 1000 ºC (εr’=13.48; tan δ = 0.01) and the LFZ grown at 100 mm/h (εr’=72.84; tan δ = 0.05). The HT at 1200 ºC was the most promising for magnetic energy storage, having the highest magnetization of all samples. From the results, it was possible to observe the influence of the processing method on the structural, electrical and magnetic properties of the BaFe2O4 system, as potential energy storage material.