在目前的工作中，我们报道了铋（Bi）取代对溶胶-凝胶法合成的M型钡六铁氧体BaBi x Fe 12− x O 19 ( x = 0.00)的结构、形态、磁性和微波吸收性能的影响、0.05、0.10 和 0.15），频率范围为 1–12.5 GHz。使用 X 射线衍射 (XRD)、傅里叶变换红外光谱 (FTIR)、场发射扫描电子显微镜 (FE-SEM)、高通量分析仪对结构、相关官能团、表面形貌、元素组成、磁性和微波吸收特性进行了分析。分辨率透射电子显微镜 (HR-TEM)、X 射线光电子能谱 (XPS)、Brunauer-Emmett-Teller (BET) 分析、振动样品磁力计 (VSM) 和矢量网络分析仪 (VNA)。 XRD图谱证实了铋离子掺杂的钡六方铁氧体具有高结晶度的单相六方结构和多晶性质。 FE-SEM 显微照片表明晶粒呈片状形状。通过 HR-TEM 显微照片确定颗粒尺寸和形状。 XPS 研究阐明了表面的元素组成和化学状态。 BET 分析揭示了比表面积和孔隙特征。添加铋掺杂剂引起的饱和磁化强度的增加归因于四面体4f 1位点中Bi 3+取代了Fe 3+。微波吸收特性显示，对于 2.9 mm 的样品厚度，最小反射损耗 (RL) 接近 − 38.78 dB，EAB RL<− 10 dB为 1.31 GHz (11.46–12.47)，EAB RL<− 20 dB为 0.5 GHz ( 12.05–12.50) 频率 12 GHz 附近，x = 0.10 显示所有组合物中反射损耗最高。最小RL低于-10dB和-20dB表明超过90%和99%的电磁波能量被吸收。因此，这项研究揭示了铋掺杂对M型钡六铁氧体的结构、形态、磁性和微波吸收性能的多方面影响，为其在各种技术应用中的利用提供了重要意义，特别是在微波吸收领域。
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Investigation on microwave absorption properties of bismuth ions doped barium hexaferrites
In the present work, we have reported the impact of bismuth (Bi) substitution on the structural, morphological, magnetic and microwave absorption properties of sol–gel route synthesized M-type barium hexaferrite BaBixFe12−xO19 (x = 0.00, 0.05, 0.10 and 0.15) within the frequency range of 1–12.5 GHz. The structure, associated functional groups, surface morphology, elemental composition, magnetic and microwave absorption characteristics, were analysed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FE-SEM), High resolution transmission electron microscopy (HR-TEM), X-ray Photoelectron Spectroscopy (XPS), Brunauer-Emmett-Teller (BET) analysis, vibrating sample magnetometer (VSM) and vector network analyzer (VNA), respectively. XRD patterns confirmed the single-phase hexagonal structure with high crystallinity and polycrystalline nature of the of bismuth ions doped barium hexaferrites. FE-SEM micrographs indicated that the grains were of platelet-like shapes. The confirmation of particle sizes and shapes were determined by HR-TEM micrographs. XPS investigations elucidated the elemental composition and chemical states at the surface level. BET analysis shed light on the specific surface area and pore characteristics. The increase in saturation magnetization caused by the addition of bismuth dopant is attributed to the replacement of Bi3+ for Fe3+ in tetrahedral 4f1 sites. Microwave absorption characteristics revealed a minimal reflection loss (RL) of nearly − 38.78 dB for a sample thickness of 2.9 mm with an EABRL<− 10 dB of 1.31 GHz (11.46–12.47) and EABRL<− 20 dB of 0.5 GHz (12.05–12.50) near the frequency 12 GHz for x = 0.10 displaying the highest reflection loss of all compositions. The minimum RL lower than − 10 dB and − 20 dB shows that more than 90% and 99% of the electromagnetic wave energy is absorbed. Therefore, this investigation sheds light on the multifaceted influence of bismuth doping on the structural, morphological, magnetic and microwave absorption properties of M-type barium hexaferrites, offering significant implications for their utilization in various technological applications, particularly in the realm of microwave absorption.
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