Ferrite nanomaterials in the form of CoAg_xFe_2−xO₄ (x = 0.0, 0.03, 0.07, 0.1, and 0.2) have been prepared by the citrate autocombustion method. Structural analysis was carried out by x-ray diffraction. Fourier-transform infrared spectroscopy confirmed the formation of a spinel crystal structure. High-resolution transmission electron microscopy revealed the formation of particles with mixed morphologies. The average particle size ranged from 22 nm to 31 nm. Vibrating-sample magnetometry revealed that the saturation magnetization M_s and coercivity H_c were affected by the grain size variation. The electrical properties of the samples were investigated over the frequency range from 10² Hz to 10⁵ Hz. Electric modulus analysis showed that the conduction was due to short-range mobility of charge carriers. The variation of the dielectric loss with frequency at different temperatures indicated two types of conduction mechanism. All these results suggest that the synthesized materials can be recommended for fabrication of exchange spring magnets and electrode materials.

 通过柠檬酸盐自燃法制备了CoAg _x Fe _{2- x} O ₄（x = 0.0、0.03、0.07、0.1和0.2）形式的铁氧体纳米材料。通过X射线衍射进行结构分析。傅立叶变换红外光谱证实了尖晶石晶体结构的形成。高分辨率透射电子显微镜揭示了具有混合形态的颗粒的形成。平均粒径为22nm至31nm。振动样品磁力分析表明，饱和磁化强度M _s和矫顽力H _c受晶粒度变化的影响。在10 ²  Hz至10 ⁵  Hz的频率范围内研究了样品的电性能。电模量分析表明，导电是由于电荷载流子的短程迁移引起的。在不同温度下介电损耗随频率的变化表明两种类型的传导机制。所有这些结果表明，合成材料可以推荐用于制造交换弹簧磁体和电极材料。