Preparation And Properties Of CoFe ₂ 4 / BaTiO <3> Multi - Phase Multi - Iron Materials

With the development of society, the electronic components began to appear small, integrated and multi functional requirements. Multiferroic material at the same time with two or more than two kinds of ferroic orders. Due to various conditions, single-phase multiferroic material have no more types and both with low Curie temperature, so in recent years, the ferromagnetic/ferroelectric composite multiferroic materials had become a hot topic in materials research. The purpose of this article is to explore the preparation method of CoFe2O4-BaTiO3 composite multiferroic materials, the composition, structure and properties of the composite materials prepared by different process conditions were studied.Firstly, We prepared barium titanate powder by solid state reaction method. We explored the powder phase, crystal form and particle size of the powders prepared under different calcination conditions, then combined with dielectric properties, ferroelectric properties test results, analyzed of the reasons for the performance difference, in order to determine the optimum calcination system:at 1000℃ for 2h, to obtain optimum performance and single tetragonal perovskite BaTiO3 powder.Secondly, We prepared cobalt ferrite powder by Co2O3 and Fe2O3, then analyzed phase forming process by XRD, and discussed the influence of calcination system on component, particle size and magnetic properties, resulted 900℃ insulation 5h can get complete spinel crystal structure, and the calcination temperature and heat preservation time had important influence on grain size and properties.Thirdly, We mixed CoFe2O4 and BaTiO3 powders, by changed the composition ratio, sintering system we found:at 1100℃ sintering temperature insulation 2h, the 0.2CoFe2O4-0.8BaTiO3 composite material was prepared and it with ferromagnetic and ferroelectric properties at the same time, the bulk density was low, serious leakage current.Finally, We improved the sintering process of multiphase materials, by adding a variety of sintering additives, using SEM to observe the micro morphology, comprehensive magnetic properties, ferroelectric properties test results were found: by adding CaCO3+SiO2 composite burning aid, we reached in lower sintering temperature and improved the purpose of the material density and performance, the bulk relative density increased to 93.3% and obvious P-E loop, hysteresis loop can be observed.