Comparison of the Sol-gel Method with the Coprecipitation Technique for Preparation of Hexagonal Barium Ferrite

Abstract

Abstract Hexagonal barium ferrite BaFe 12 O 19 particles were prepared by sol-gel and coprecipitation methods, respectively. The composition of the so-obtained materials was investigated by means of XRD. By the sol-gel method, non-anticipated intermediate crystalline phases, such as γ-Fe 2 O 3 , α-Fe 2 O 3 , BaCO 3 , and BaFe 2 O 4 etc. , were formed with the delay of the formation of BaFe 12 O 19 . The formation of single phase BaFe 12 O 19 required calcination at 850 °C for 4 h. On the other hand, using coprecipitation technique, amorphous hydroxide precursor was directly transferred into BaFe 12 O 19 almost without the formation of intermediate crystalline phases. BaFe 12 O 19 was prepared by calcining at 700 °C for 3 h. The results were confirmed by ESEM and VSM analyses. Based on the already reported results and the observed results in this study, it can be concluded that the coprecipitaion technique is easier to control than the sol-gel method for preparation of BaFe 12 O 19 at a low temperature.