Al^(3+)替代Fe^(3+)对高频大功率NiZn铁氧体性能的影响

The Influence of Al^(3+) Substitution on the Properties of NiZn Ferrite

采用化学共沉法制备了Ni0.6Zn0.4Fe2-xAlxO4(x=0~0.12)纳米粉体,用XRD分析了粉体物相;测量了样品的居里温度TC、起始磁导率i、矫顽力Hc、电阻率ρ、介电损耗角正切tanδe和磁损耗角正切tanδm、摆幅磁感应强度△B。结果表明:样品均为单相的尖晶石结构。Al3+有效地抑制了Fe2+的产生,使NiZn铁氧体的电阻率ρ增大,介电损耗角正切tanδe和磁损耗角正切tanδm下降,Al3+替代Fe3+,居里温度TC和摆幅磁感应强度△B仍保持较高的数值。这种方法是一种提高高频大功率NiZn铁氧体性能的有效方法。

Nanosized Ni0.6Zn0.4Fe2-xAlxO4 (x=0 to 0.12 ) powders were prepared by using the chemical co-precipitation method. The phase structure was characterized by X-ray diffraction (XRD). The Curie temperature TC, initial susceptibility i , electrical resistivity ρ, magnetic and dielectric loss tangent (tanδm , tanδe), coercive force Hc , swing flux △B of all samples were measured. The results indicate that all samples are single-phase compounds with spinel structure. With Al3+ substitution for Fe3+, Fe2+ is restrained effectively, making the resistivityρof ferrite increased, tanδm and tanδe decreased. Swing flux density △B becomes large, as well the Curie temperature TC still keep considerably high for Al3+-substituted NiZn ferrites. This is an effective method to improve the properties of NiZn ferrite.