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).

中文翻译：

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钕掺杂对六铁酸锶颗粒在X波段磁、介电和微波吸收性能影响的研究

摘要 采用自燃路线开发了由掺钕 (Nd) 锶六铁氧体 Sr1-xNdxFe12O19 (X = 0.1、0.2 和 0.3) 组成的微波吸收材料。XRD 谱证实形成了不含杂质的纯铁素体相。Nd 作为六铁氧体颗粒生长的抑制剂，导致铁氧体的平均粒径从 638.02 nm 减小到 478.19 nm。磁滞回线显示未掺杂的铁氧体具有高饱和磁化强度，随着钕掺杂浓度的增加，进一步观察到从 41.185 emu/g 下降到 37.145 emu/g。由于单轴磁晶各向异性的减弱，掺杂的锶六铁氧体的矫顽力也显示出类似的模式，从 387.97 G 下降到 278.37 G。阻抗匹配和反射损耗随着钕掺杂浓度的增加而改善。观察到样品的衰减常数和反射损耗的最佳值，X = 0.3。在 9.62 GHz 处的最大反射损耗值为 -40.595 dB，其中 -10 dB 带宽为 3.13 GHz（约 X 波段的 75%）。