Ni0.26Cu0.22Zn0.52Fe2O4 ferrites doped with different Bi2O3 contents (0–2.0 wt% in intervals of 0.5 wt%) were successfully prepared by conventional solid-state reaction method at 920 °C. The phase composition, microstructure, and magnetic properties, especially gyromagnetic properties of these samples were systematically investigated. First, X-ray diffraction patterns demonstrated that all samples exhibit a single spinel phase. Moreover, scanning electron microscopy image analysis revealed that Bi2O3 can significantly promote grain growth and densification of NiCuZn ferrites. In terms of magnetism, the compact and uniform sample doped with 1.0 wt% Bi2O3 possessed low coercivity (HC = ∼193.60 A/m) and high saturation magnetization (4πMS = ∼3959 Gs). More importantly, due to the grain growth and reduction of porosity, the ferromagnetic resonance linewidth (ΔH) of the samples decreased from 288.9 Oe to 218.8 Oe. These results suggested that Bi2O3 is an effective sintering aid to enhance the gyromagnetic properties of ferrite materials used in microwave devices.

中文翻译：

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Bi2O3 添加剂增强低温烧结 NiCuZn 铁氧体的旋磁性能


采用常规固相反应方法在920℃下成功制备了不同Bi2O3含量（0-2.0wt%，间隔0.5wt%）的Ni0.26Cu0.22Zn0.52Fe2O4铁氧体。对这些样品的相组成、微观结构和磁性能，特别是旋磁性能进行了系统研究。首先，X 射线衍射图表明所有样品均呈现单一尖晶石相。此外，扫描电子显微镜图像分析表明，Bi2O3可以显着促进NiCuZn铁氧体的晶粒长大和致密化。在磁性方面，掺杂1.0 wt% Bi2O3 的致密均匀的样品具有低矫顽力（HC = ∼193.60 A/m）和高饱和磁化强度（4πMS = ∼3959 Gs）。更重要的是，由于晶粒长大和孔隙率降低，样品的铁磁共振线宽（ΔH）从288.9 Oe减小到218.8 Oe。这些结果表明，Bi2O3 是一种有效的烧结助剂，可增强微波器件中使用的铁氧体材料的旋磁性能。