Structure and magnetic properties of NiCuZn ferrite materials with La doping
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Ni0.3Cu0.07Zn0.63Fe2-x La x O4 ferrites were prepared by solid phase method and sintered at 1,150 °C for 6 h. The phase formation, microstructure, and magnetic properties of samples were investigated. With doping of La3+, the samples contain two phases: LaFeO3 and NiCuZn ferrites. Scanning electron microscope (SEM) image shows that La doping constrains the growth of NiCuZn ferrite, which is more uniform. La doping improves magnetic properties of NiCuZn ferrite when x ≤ 0.03. The saturation magnetization (M s) increases first; when x = 0.03, the highest value is 75.35 A·m2·kg-1. The permeability increases to the maximum value with frequency and then decreases with the concentration of La3+ increasing. When x = 0.03, the maximum value of real permeability at 1 MHz is 333.5, and the loss angle tangent (tanδ) is not more than 0.02. La doping improves the properties of NiCuZn ferrite, which can be applied to low-frequency filters.
KeywordsNiCuZn ferrite La doping Properties
This work was financially supported by the National Basic Research Program of China (No. 2012CB933100), the National Natural Science Foundation of China (Nos. 61001025 and 51132003), and the Second Item of Strongpoint Industry of Guangdong Province (No.2012A090100001).
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