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采用溶胶–凝胶法制备Ce3+掺杂镍基复合铁氧体NiCexFe2–xO4(x=0.02、0.04、0.06、0.08、0.10)粉体。用X射线衍射仪、扫描电子显微镜、振动样品磁强计和矢量网络分析仪表征粉体的结构及电磁性能。结果表明:Ce3+掺杂量x≤0.06时,得到的粉体为纯净的尖晶石型铁氧体。在室温条件下,不同Ce3+掺杂量下得到的粉体均具有超顺磁性;当x=0.06时,粉体最大比饱和磁化强度为59.47 A.m2/kg。复介电常数实部ε′在x=0.08时最大,在x=0.04时最小,其虚部ε″在x=0.06时最大,在x=0.10时最小。Ce3+掺杂量的变化对样品复磁导率实部μ′影响不大,在2～6GHz频率范围内,随Ce3+掺杂量增大,样品的复磁导率虚部μ″先增大后减小,x=0.06时最大,x=0.10时最小。对掺杂前后样品的阻抗匹配和吸波性能进行了分析,掺杂后的匹配厚度降低了1.52mm,最小反射率降低了11.16dB,反射率小于–10dB时频带宽度增加了1.80GHz。Ce3+掺杂量x=0.06时可有效改善镍铁氧体的电磁波吸收性能。
Ce3 + doped Ni-based composite ferrite NiCexFe2-xO4 (x = 0.02,0.04,0.06,0.08,0.10) powders were prepared by sol-gel method. The structure and electromagnetic properties of the powders were characterized by X-ray diffraction, scanning electron microscopy, vibrating sample magnetometer and vector network analyzer. The results show that when the Ce3 + doping amount is less than or equal to 0.06, the obtained powder is pure spinel ferrite. At room temperature, the powders obtained under different Ce3 + doping amounts have superparamagnetism. When x = 0.06, the maximum specific saturation magnetization of the powders is 59.47 A.m2 / kg. The real part ε ’of the complex permittivity is the largest at x = 0.08, the smallest at x = 0.04, and the imaginary part ε “is the largest at x = 0.06 and the smallest at x = 0.10 The change in the amount of Ce3 + The real part μ ’of magnetic permeability has little effect. In the frequency range of 2 ~ 6GHz, with the increase of Ce3 + doping, the imaginary part μ ”of the complex permeability first increases and then decreases, and reaches the maximum at x = 0.06, The smallest when x = 0.10. The impedance matching and wave absorption performance of the samples before and after doping were analyzed. The matching thickness after doping decreased by 1.52mm, the minimum reflectance decreased by 11.16dB, and the bandwidth increased by 1.80GHz when the reflectance was less than -10dB. Ce3 + doping amount x = 0.06 can effectively improve the nickel ferrite electromagnetic wave absorption properties.