稀土Ce^(3+)掺杂纳米CoFe_2O_4的制备及其吸波性能

Preparation and Properties of Ce-doped Cobalt Ferrite

采用溶胶-凝胶自蔓延燃烧法制备稀土Ce^(3+)掺杂纳米CoFe_2O_4,使用XRD、EDS、FT-IR、TEM和PNA等手段对产物的物相组成、形貌和电磁参数进行表征和分析,研究了掺杂稀土Ce^(3+)对纳米CoFe_2O_4的结构和吸波性能的影响。结果表明:所制备出的CoFe_2O_4和CoFe_(1.7)Ce_(0.3)O_4具有尖晶石型结构,其粒径分别为70 nm和60 nm;在0~6 GHz频率范围内CoFe_(2-x)Ce_xO_4的吸波性能比纯CoFe_2O_4有了很大的提高,当x=0.3时吸波性能最佳,在5030 MHz处最大吸收峰值为-27.6 d B,-5 d B频宽为1.6GHz。

Nanostructure of CoFe（2-x）CexO4（x=0,0.1,0.2,0.3,0.4） was synthesized by sol-gel coupled with self-propagating method. The prepared nanostructures were characterized by means of XRD, EDS,FT-IR, SEM, TEM and PNA in terms of phase constituents, morphology and electromagnetic properties.Peculiarly, the influence of the amount of Ce^3 ＋on absorbing properties was investigated. Results show that the prepared CoFe2O4 has spinel structure. The average diameter of particles is about 70 nm. The microwave absorption ability of the CoFe2-xCexO4 is greatly improved in the frequency domain of 0-6 GHz,in comparison to the pure CoFe2O4. When the Ce^3＋content is 0.3 it has the best wave-absorbing property at 5030 MHz, of which the maximum absorption can reach-27.6 dB and within a bandwidth of 1.6 GHz,its absorption is above-5 dB.