M-type hexagonal ferrite powders, SrFe12−2xLax(Mn0.5Zr0.5)xO19 (x=0.0, 0.2, 0.4, 0.6, 0.8), have been synthesized by the coprecipitation method. The X-ray diffraction, field emission scanning electron microscope, vibrating sample magnetometer and vector network analyzer all were used to characterize the structure of the samples, their magnetic and microwave properties. The value of the saturation magnetization increased up to x=0.2 and then slowly decreased with increasing doping. A decreasing trend was observed in the value of coercivity with increasing substitution degree, and its value reached a minimum of 2420 Oe for x=0.6 and then increased with further increasing x. The relative complex permittivity and permeability of the composite powders were investigated in the X-band frequency range (8.2–12.4 GHz).
M-type hexaferrites Magnetic properties Rare-earth Microwave properties
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The authors would like to thank the Office of Graduate Studies of the University of Isfahan for their support. E. Kiani would like to thank the Iranian Nanotechnology Initiative Council for their support.