M型铁氧体BaNi_(x/2)Co_(x/2)Zr_xFe_(12-2x)O_19纳米粉体的高频电磁特性

Fabrication and magnetic properties studies of BaNi_(x/2)Co_(x/2)Zr_xFe_(12-2x)O_19 nanoparticles

采用自蔓延法制备了Ni-Co-Zr离子共掺BaFe12O19的前驱体,并研究了不同掺杂量对样品微结构和磁性能的影响。通过XRD、SEM、VSM和VNA等对样品进行性能表征,发现BaFe10Ni0.5Co0.5-Zr1.0O19在1 100℃保温4 h,矫顽力H c仅7.4×103A/m,饱和磁化强度M s为28.6 A·m2/kg;BaFe10.4-Ni0.4Co0.4Zr0.8O19在1 100℃保温4 h后,矫顽力H c为4.62×104A/m,饱和磁化强度M s却有50.2 A·m2/kg。离子掺杂对M型钡铁氧体的复介电常数有一定影响;随着掺杂增加复磁导率μ'先增加后降低,减小了材料的应用频率范围。同时Ni-Co-Zr离子掺杂使得产物颗粒粉体晶粒细化,活性增加。

Ni-Co-Zr substituted BaM ferrite particles were prepared by the sol-gel method, the influence of substitution on microstructure and magnetic properties were studied. Phase structure and microscope image of sam-le were investigated by X-ray diffraction and scanning electron microscopy, its static magnetic properties was studied by a Vibrating sample magnetometer. Complex permeability and permittivity were measured using a vector network analyzer （Agilent E5071C） in the frequency range of 0.1-14 GHz. Furthermore, coercivity of BaFe10Ni0.5Co0.5Zr1.0 019 was only 7.4× 10^3 A/m and saturation magnetization was 28.6 A . m^2/kg after heat treatment at 1 100 ℃ with 4 h, and coercivity of BaFe10.4 Ni04 Co0.4 Zr0.8 O19 was 4.62 × 10^4 A/m, the saturation magnetization was 50.2 A . m^2/kg. The dielectric properties of the doping BaM have certain influence at the frequency range. With increasing Ni-Co-Zr substitutions,μ′ will be increased after a decrease that reduced the material application scope. Meanwhile, Ni-Co-Zr ion doping makes grain of product refinement, activity increase.