采用固相反应法制备添加Ta2O5的NiCuZn铁氧体,研究了不同Ta2O5含量对NiCuZn铁氧体显微结构,静磁性能和高频损耗的影响。结果表明： Ta2O5具有细化 NiCuZn 铁氧体晶粒的作用,可降低材料的烧结密度。随着Ta2O5含量的增加,样品的饱和磁感应强度和起始磁导率单调减小,矫顽力则逐渐增大,截止频率逐渐升高,而高频损耗呈先降低后增加的趋势,其主导因素由剩余损耗逐渐过渡到磁滞损耗。当Ta2O5含量为0.12wt%时,样品在3 MHz、10 mT、100℃下总损耗最小,为139 mW/cm3,其中磁滞损耗和剩余损耗分别为93 mW/cm3和46 mW/cm3。%NiCuZn ferrites doped with Ta2O5 additive were prepared by solid-state reaction method. The influence of Ta2O5 additive on the microstructure, static magnetic properties and high frequency losses (Pcv) of NiCuZn ferrites were investigated. The results reveal that Ta2O5 can refine the grain of NiCuZn ferrites, and consequently reduce the sintering density. At the same time, the saturation induction and initial permeability of samples reduce monotonously with the increase of Ta2O5 content. The coercive force and resonance frequency, however, increase gradually. Further-more, the high frequency losses (Pcv) firstly decrease and then increase, and the dominant factor of Pcv transforms from residual loss (Pr) to hysteresis loss (Ph), so the Pcv has a valley value when Ta2O5 content is 0.12wt%. The lowest Pcv is 139 mW/cm3 at the conditions of 100℃, 3 MHz and 10 mT, where Ph and Pr are 93 mW/cm3 and 46 mW/cm3, respec-tively.
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