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Synthesis and characterization of low density porous nickel zinc ferrites

机译：低密度多孔镍锌铁氧体的合成与表征

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Ni–Zn ferrite has important applications in the field of soft magnetic materials due to its excellent magnetic properties, but its high bulk density hinders its promotion. Herein, an oxalate precursor was prepared by a coprecipitation method with metal sulfate and oxalic acid as raw materials. The low density porous Ni–Zn ferrite powder was prepared by thermal decomposition in an aerobic environment with the oxalate precursor. The microstructure, morphology, and dielectric and magnetic properties of Ni–Zn ferrite were studied by thermogravimetric and differential scanning calorimetry, X-ray powder diffraction, X-ray photoelectron spectroscopy, Fourier transform-infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, tap density testing for powder, vibrating sample magnetometry, specific surface and aperture analysis and vector network analysis. The results showed that the purity, morphology, grain size and saturation magnetization of Ni–Zn ferrite were controlled by many factors such as synthetic temperature, retaining time and environmental conditions. Under an oxygen atmosphere, pure Ni–Zn ferrite can be prepared from an oxalate precursor by a thermal process. The ferrite has a wood-splitting appearance and a multi-layered internal cavity structure, and the bulk density is only 1/3 of the general ferrite. It has good soft magnetic and microwave absorbing properties, which makes it a potential excellent material for microwave absorbers.
机译：镍锌铁氧体由于其优异的磁性能而在软磁材料领域具有重要的应用，但其高堆积密度阻碍了其推广。在此，以金属硫酸盐和草酸为原料，通过共沉淀法制备草酸盐前体。低密度多孔镍锌铁氧体粉末是通过在有氧环境中与草酸盐前体热分解制备的。通过热重分析和差示扫描量热法，X射线粉末衍射，X射线光电子能谱，傅立叶变换红外光谱，扫描电子显微镜，透射电子显微镜，电镜和电子显微镜研究了镍锌铁氧体的微观结构，形态以及介电和磁性能。粉末的振实密度测试，振动样品磁力分析，比表面积和孔径分析以及矢量网络分析。结果表明，镍锌铁氧体的纯度，形貌，晶粒尺寸和饱和磁化强度受合成温度，保留时间和环境条件等许多因素控制。在氧气气氛下，可以通过热处理从草酸盐前驱体制备纯镍锌铁氧体。铁氧体具有劈裂的外观和多层内部空腔结构，其堆密度仅为普通铁氧体的1/3。它具有良好的软磁和微波吸收性能，使其成为潜在的微波吸收材料。

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