Sr_xBa_3-xCo₂Fe₂₄O₄₁ Z-type hexaferrites have been prepared by the citric acid sol-gel method, and the structural and electromagnetic properties have been investigated in detail. The results showed that single-phase Z-type hexaferrites were observed, and all samples exhibited excellent soft magnetic properties. For the sample with x = 1.5, a high resonant frequency f_r = 3.50 GHz and initial permeability μ′ = 2.76 at 100 MHz was obtained. The calculated frequency dependence spectrum of the reflection loss (RL) showed a largest absorbing value of −48.5 dB at 17.6 GHz with a thickness of 5.0 mm. With the increasing thickness t, two local minimum RL values were observed from the RL-t curve. One was −43.6 dB at t = 4.3 mm and the other was −45.8 dB at t = 2.8 mm. The dependence of percentage bandwidth W_P on thickness t was studied. As t increasing, W_P increased firstly and then slowly decreased, reaching the maximum value of 96.1% at t = 3.3 mm.

通过柠檬酸溶胶-凝胶法制备了Sr _x Ba _3-x Co ₂ Fe ₂₄ O ₄₁ Z型六价铁氧体，并对其结构和电磁性能进行了详细的研究。结果表明，观察到单相Z型六价铁氧体，并且所有样品均表现出优异的软磁性能。对于x = 1.5的样品，高谐振频率f _r  = 3.50 GHz和初始磁导率μ获得了100 MHz时的2.76。计算出的反射损耗（RL）的频率依赖性频谱在17.6 GHz处具有5.0mm的最大吸收值，为-48.5 dB。随着厚度t的增加，从RL-t曲线观察到两个局部最小RL值。一个在t = 4.3 mm时为-43.6 dB，另一个在t = 2.8 mm时为-45.8 dB。研究了带宽百分比W _P对厚度t的依赖性。随着t的增加，W _P先增加然后缓慢降低，在t = 3.3 mm时达到最大值96.1％。