کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1800605 | 1024540 | 2012 | 6 صفحه PDF | دانلود رایگان |
The microwave absorption properties of zinc oxide/carbonyl iron composite nanoparticles fabricated by high energy ball milling were studied at 0–20 GHz. Experiments showed that ZnO as a kind of dielectric material coating carbonyl iron particles made the bandwidth of reflection loss (RL)<−5 dB expanding to the low frequency, and enhanced absorption effect obviously. For a 3 mm thickness absorber of ZnO/carbonyl iron after 30 h milling, the values of RL<−5 dB and RL<−8 dB were obtained in the frequency range from 7.0 GHz to 17.8 GHz and from 9.8 dB to 14.9 dB, respectively, and its strongest RL peak was −29.34 dB at 13.59 GHz. The magnetic loss of carbonyl iron particles and the dielectric loss of ZnO particles were the main mechanisms of microwave absorption for the composites.
► We fabricated zinc oxide/carbonyl iron composites by high energy ball milling.
► ZnO dielectric property increased absorption effect and absorption bandwidth.
► Absorbing frequence of composites is expanding to low frequency direction.
► The craft of high energy ball milling is easy to realize commerce production.
Journal: Journal of Magnetism and Magnetic Materials - Volume 324, Issue 9, May 2012, Pages 1720–1725