替代M-型钡铁氧体纳米粒子的微波吸收性能

Microwave-Absorbing Behavior of Substituted M-Type Barium Ferrite Nan o-Particles

The microwave-absorbing behavior o f substituted M-type barium ferrite nano-particles was investigated.T he nano-particles were synthesized wi th coprecipitation-melted salt method.For the purpose of comparison,c orre-sponding micro-particles were also prepared through direct coprecipitation and sintering.XRD and TEM of th e nano-particles showed that the ferr ite was hexagonal in structure and wi dely distributed in size with partic le size being less than 100nm,the complex permittivity and permeability of a 1.50mm thick specimen and a 1.40mm thick specimen containing 60%by weight of substituted M-type barium ferrite n ano-particles and micro-particles were measured respectively in X band(8.2～12.4GHz )range,from which the reflection loss(R.L.)of microwaves was calculated and two comparative abso rption curves were given.The results showed that the synthetic nano-particles could well absorb microwaves in X ban d.The absorption was larger than 10dB in the range of 9.2～12.4GHz while the maximum absorption was 38.6dB at10.6GHz.