Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1799704 | Journal of Magnetism and Magnetic Materials | 2014 | 5 Pages |
•NiCoZn-ferrites doped with La3+ ions, Ni0.35Co0.15Zn0.5LaxFe2O4(x=0, 0.02, 0.04, 0.06), were prepared by sol–gel method.•All samples exhibited a well defined spinel phase when x≤0.04 with the sintering temperature of 1000 °C.•The La3+ ions doped in the ferrite not only improved complex permittivity, but also microwave absorbency.•The minimum reflection loss of −34 dB was obtained for x=0.02 sample for thickness t=4 mm and its bandwidth under −10 dB reaches 5.5 GHz.
NiCoZn-ferrites doped with La3+ ions, Ni0.35Co0.15Zn0.5LaxFe2O4(x=0, 0.02, 0.04, 0.06), were prepared by sol–gel method. The effect of the La3+ ions doping on the microstructure, complex permeability, permittivity and microwave absorption of the samples was investigated. The results show that all samples exhibited a well defined spinel phase when x≤0.04 with the sintering temperature of 1000 °C. With the increase of the substitution ratio of La3+ ions from 0 to 0.06, the lattice parameters increased gradually, which resulted in the change of the particle shape and size. The data of magnetism showed that the addition of La3+ ions result in the decrease of saturation magnetization (Ms) and coercivity (Hc). The La3+ ions doped in the ferrite not only improved complex permittivity, but also microwave absorbency. The minimum reflection loss of −34 dB was obtained for x=0.02 sample for thickness t=4 mm and its bandwidth under −10 dB reaches 5.5 GHz.