Authors: Ali Sharbati Javad Mola Verdi Khani
Publish Date: 2013/06/07
Volume: 24, Issue: 10, Pages: 3629-3633
Abstract
Sr1−x Ho x ZnZr05Fe11O19 x = 003 006 and 009 hexaferrite nanocrystallites of average sizes in the range of 46–60 nm are synthesized by the citrate sol–gel method Crystalline structure morphology magnetic properties and microwave absorption properties of powders were studied via Xray diffraction field emission scanning electron microscope vibrating sample magnetometer and vector network analyzer respectively The magnetic properties such as saturation magnetization M s and coercivity H c were calculated from hysteresis loops The XRD patterns show that the main phase is Mtype strontium hexaferrite without other impurity phases Microwave absorption properties of hexaferrite 70 wt–acrylic resin 30 wt composites were measured by the standingwaveratio SWR method in the range from 12 to 20 GHz Results showed that substitution of Ho3+ ions for Sr2+ ions in SrZnZr05Fe11O19 resonance frequency moves to higher frequency For samples with x = 003 a minimum reflection loss of −42 dB was obtained at 166 GHz for a layer of 17 mm in thickness It was concluded that the prepared composites could be good candidates for electromagnetic compatibility and other practical applications at high frequency
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