In current study, Cr-substituted W-type hexaferrites with chemical formula (BaNi₂Cr_xFe_16-xO₂₇ for x = 0.0, 0.1, 0.2, 0.3 and 0.4) have been investigated in order to tailor the structural, magnetic and electromagnetic properties of these ferrites which can be suitable at higher working frequencies. The desired samples were prepared by the sol-gel auto-combustion technique and thereafter investigated by thermal gravimetric/differential thermal analysis (TGA/DTA), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy(SEM), energy dispersive X-ray (EDX) spectroscopy, vibrating sample mangnetometer (VSM) and vector network analyzer (VNA). The XRD peaks showed that single phase formation of these ferrites could be successfully done at a temperature of 1300 °C which was further confirmed from the length of minor and major axis (a, and c), unit or single cell volume (V) and theoretical density (d_x). It was observed that the values of all these parameters were consistent with the previously reported literature. The SEM images exhibited platelet like and hexagonal shape morphology which is very suitable shape for microwave absorbing applications.IR spectrum for sintered sample revealed two well defined absorption peaks which correspond to tetrahedral A- and octahedral B-sites present in W-type hexagonal lattice. The magnetic hysteresis loops for all the prepared samples were found to be thinner having a low value of coercivity (~ a few hundred Oersted) revealing the soft magnetic nature which is a pre-requisite of high frequency applications. The high frequency dielectric parameters were also studied in frequency range (1-6GHz) and all the parameters follow the Koop’s phenomenological theory which is consistent with the Maxwell-Wegner model. The observed properties indicate that these ferrites will have high prospects in high frequency applications such as dielectric resonators, multilayer chip inductors (MLCIs) and for camouflaging the important military arsenals such as aircraft, ship and tank etc.

在目前的研究中，Cr 取代 W 型六铁氧体的化学式为 (BaNi ₂ Cr _x Fe _16-x O ₂₇对于 x = 0.0、0.1、0.2、0.3 和 0.4)，已经进行了研究，以定制这些铁氧体的结构、磁性和电磁特性，使其适用于更高的工作频率。通过溶胶-凝胶自燃技术制备所需样品，然后通过热重/差热分析 (TGA/DTA)、X 射线衍射 (XRD)、傅里叶变换红外 (FT-IR) 光谱、扫描电子显微镜 (SEM)、能量色散 X 射线 (EDX) 光谱、振动样品磁力计 (VSM) 和矢量网络分析仪 (VNA)。XRD 峰表明这些铁氧体可以在 1300 °C 的温度下成功形成单相，这从短轴和长轴的长度 (a 和 c)、单元或单晶胞体积 (V) 和理论密度（d_X）。观察到所有这些参数的值与先前报道的文献一致。SEM 图像显示出片状和六边形形态，这是非常适合微波吸收应用的形状。烧结样品的红外光谱显示两个明确的吸收峰，它们对应于 W 型六边形晶格中存在的四面体 A 位点和八面体 B 位点。发现所有制备的样品的磁滞回线更薄，具有低矫顽力值（~几百奥斯特），揭示了软磁性质，这是高频应用的先决条件。还研究了频率范围（1-6GHz）的高频介电参数，所有参数都遵循Koop的现象学理论，与Maxwell-Wegner模型一致。