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摘要
Cobalt-zirconium (Co2+-Zr4+) doped M-type lanthanum strontium hexaferrite with general formula, Sr0.85La0.15(CoZr)(x)Fe12-2xO19 where x = 0, 0.25, 0.50, 0.75, 1.0, prepared by citrate auto-combustion method have been analyzed for the first time. These ferrites were characterized by X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy, vibrating sample magnetometer and vector network analyzer. The complex permittivity (E >' - jE >'') and complex permeability (A mu' - jA mu'') were measured using vector network analyzer in 12.4-18.0 GHz (Ku-band) frequency range. Magnetic hysteresis data indicates 16.6% decrease in saturation magnetization M-s with substitution x (60.6 emu/g for x = 0.0 and 50.5 emu/g for x = 1.0). There is 53.79% decrease in coercivity H-c with substitution x (5692.55 Oe for x = 0.0 and 2630.38 Oe for x = 1.0). Microwave absorption of more than 99% has been obtained for all the synthesized ferrites at some frequency in Ku-band. So, microwave absorbers can be designed for different frequencies in Ku-band by varying the substitution x as well as thickness of the absorber.
- 出版日期2017-11
