Preparation And Properties Of The NiCuZn Ferrite Powder

In this years, as the evolution of miniaturization, efficient and multi-functional ofelectronic products accelerated, higher requirements have been raised to the material appliedin manufacturing the electronic products. As a soft magnetic material, NiCuZn ferrite hasbetter electromagnetic performance and lower losses, therefore it has been widely used inmanufacture of electronic devices. In this paper, we prepared nano ferrite powder bychemical co-precipitation method, the main content of the study is the impact of Mg2+andCo2+co-substituted on the magnetic properties of materials, moreover we study theprecipitant, reaction temperature, reaction time and calcination temperature impact on thesynthesis of NiCuZn ferrite powder.First, the impact of different reaction temperature and reaction time on the products werecompared under different precipitating agent system, the result show that eachco-precipitation reaction was able to complete in about2hours, excessive extend the reactiontime will cause an increase in the powder particle size, however, an appropriate increase inthe reaction temperature could reduce the particle size. In these products synthesized atdifferent precipitant, the powders prepared by NH3·H2O and (NH4)2C2O4have a lower yield,and the constituent has a slight deviation. Only the NaOH precipitant can synthesis thepowders with not only the product yield is high, and its constituent is basically consistentwith the experimental design. The reaction using NaOH precipitant at70℃for2hours wasable to get NiCuZn ferrite ultrafine powder with an average particle size of about20nm.Secondly, microstructure, magnetic properties of the NiCuZn ferrite calcined at differenttemperatures was researched by TEM and VSM to determine the optimum calcinationtemperature is700℃. Calcined at this temperature could get a sample with an average grainsize of26nm, the saturation magnetization and coercivity were73A·m2·kg-1and0.42kA·m-1respectively, and the aggregates is not evident.At last，by using Mg2+and Co2+co-substituted to modified ferrite powder, we can got a sample with a biggest saturation magnetization166A·m2·kg-1and a coercive force0.56Hc/kA·m-1when the amount of substitution of Mg2+and Co2+were0.05and0.08respectively.