Abstract
Microwave absorbing materials consisting of neodymium (Nd) doped strontium hexaferrites, Sr1-xNdxFe12O19 (X = 0.1, 0.2 and 0.3), were developed using auto-combustion route. The XRD spectrum confirmed the formation of pure ferrite phase with no impurity. The Nd acted as an inhibitor for the growth of hexaferrite particles which resulted in a decrease in the average particle size of ferrite from 638.02 nm to 478.19 nm. The hysteresis loop revealed that the undoped ferrite has high saturation magnetization which further observed to decrease from 41.185 emu/g to 37.145 emu/g with the increasing neodymium doping concentration. The coercivity of the doped strontium hexaferrites also showed similar pattern which decreased from 387.97 G to 278.37 G due to the weakening of uniaxial magnetocystalline anisotropy. The impedance matching and reflection loss improved with the increase in the doping concentration of neodymium. The optimum value of attenuation constant and reflection loss was observed for the sample, X = 0.3. The maximum reflection loss value of −40.595 dB at 9.62 GHz was obtained with −10 dB bandwidth of 3.13 GHz (≈75% of the X-band).
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