Nicuzn Magnetic Base Of The Structure And Properties Of The Composite Ceramic Research

Ferromagnetic-ferroelectric composite material is newly composite ceramics because of their interesting dielectric and magnetic properties which can be used in many electric devices, such as electromagnetic interference filters and the integration of chip inductors and capacitors. However, development of a high-quality composite material with simultaneous ferromagnetic and ferroelectric characteristics is faced with a lot of challenges. Nio.2Cuo.2Zno.62(Fe2O3)0.98is one of soft magnetic materials which has been widely studied. It is chosen as a ferrite phase because of its high permeability, high curie temperature, high frequency, and relative low loss tangent. Dielectric constant of Bi0.5Nao.5Ti03and Lao.5Cao.5Mn03is900and105respectively,other dielectric property is very good,too, which is chosen as dielectic phase.we prepared the Bi0.5Nao.5Ti03(BNT)、Lao.5Ca0.5MnO3(LCM) and Nio.2Cuo.2Zno.62(Fe2O3)0.98by the solid-state reaction method.The composition effects of xBNT+(1-x)NiCuZn(x=0、10、20、40、60wt.%) and xLCM+(1-x)NiCuZn (x=0、0、20、30、50wt.%) composites were investigated by a solid-state reaction method with addition of3wt.%Bi2O3The sintering behaviors, phases, microstructures, and electromagnetic properties of studied systems were investigated.For xBNT+(1-x)NiCuZn (x=0、10、20、40、60wt.%), all the composite ceramics can be sintered from940℃to980℃which is dense ceramic. X-ray diffraction (XRD) results showed that the sintered ceramics are two phase composites which were consisted of BNT and NiCuZn phases. No significant chemical reactions occurred between BNT and NiCuZn grains during firing. However, the major peak of BNT and NiCuZn shifted which suggests that a significant ion diffusion occured. Backscattered electron images show micrographs of sintered xBi05Na0.5Ti03+(1-x) Nio.2Cuo.2Zno620(Fe2O3)o.98. With increasing BNT content, ferrite grain size become small. It indicated that the BNT phase restains the grain growth of the spinel NiCuZn phase. By EDS, an obvious ion diffusion occur in complex phases of ceramics. The real permittivity continuously increased and the permeability decreases with increasing the BNT content. The40wt.%BNT+60wt.%NiCuZn composite exhibits excellent integrated properties (εr=86.85, tanδε|1MHZ=0.023, μ=33.8, tanδμ|1MHz=0.18).The xLCM+(1-x)NiCuZn(x=0、10、20、30、50wt.%) composite ceramics can be sintered from950℃to1000℃which is dense ceramics. X-ray diffraction (XRD) results showed that no significant chemical reactions occurred between LCM and NiCuZn ceramics during firing. Backscattered electron images shows micrographs of sintered x Lao.5Cao.5Mn03+(1-x) Ni0.2Cu0.2Zno.620(Fe203)o.98. With increasing LCM content, ferrite grain size become small. It indicated that the LCM phase restains the grain growth of the spinel NiCuZn phase. The mutual effects of magnetization of NiCuZn ferrite phase and polarization of LCM made the permeability decrease with the content of LCM increasing. For the30wt.%LCM+70wt.%NiCuZn composite exhibits excellent integrated properties (εr=125, tanδε|MHz=0.097602, μ=34.27, tanδμ|iMHz=0.232151). which can be used not only as inductiors but also as capactiors.