Abstract A series of Li-Cd doped cobalt ferrites CoLixCdxFe2−2xO4 (x = 0.0, 0.05, 0.1, 0.15, 0.2, 0.25) has been synthesized by hydrothermal method in the presence of cetyltrimethylammonium bromide (CTAB) as capping agent. XRD data has confirmed the formation of single crystalline cubic phase with average crystallite size of synthesized samples between 24 and 28 nm. For all the samples the resistivity was found to increase with increase in dopants concentration with highest value of 7.3 × 107 ohm·cm at Li-Cd content x = 0.1. Dielectric constant values of all the samples follow the typical Maxwell-Wagner type dispersion due to interfacial polarization and were observed to decrease with increase in frequency, which is a typical phenomenon in ferrites. The coercivity (Hc), saturation magnetization (Ms) and remanent magnetization (Mr) of all the samples increase with dopant content, with maximum values of 936 Oe, 54 emug−1 and 30 emug−1 respectively at x = 0.1. The obtained data with improved coercivity, saturation magnetization and remanent magnetization make Li-Cd doped cobalt ferrites as suitable materials for utilization in transformer cores and transmission lines.

中文翻译：

---

Li-Cd 离子共取代增强铁氧体钴纳米粒子的电学和磁学性能

摘要 以十六烷基三甲基溴化铵(CTAB)为封端剂，采用水热法合成了一系列Li-Cd掺杂钴铁氧体CoLixCdxFe2−2xO4 (x = 0.0, 0.05, 0.1, 0.15, 0.2, 0.25)。XRD 数据已经证实形成了单晶立方相，合成样品的平均晶粒尺寸在 24 到 28 nm 之间。对于所有样品，发现电阻率随着掺杂剂浓度的增加而增加，在 Li-Cd 含量 x = 0.1 时最高值为 7.3 × 107 ohm·cm。由于界面极化，所有样品的介电常数值遵循典型的 Maxwell-Wagner 型色散，并观察到随着频率的增加而降低，这是铁氧体中的典型现象。矫顽力（Hc），所有样品的饱和磁化强度 (Ms) 和剩余磁化强度 (Mr) 随着掺杂剂含量的增加而增加，最大值分别为 936 Oe、54emug-1 和 30emug-1，x = 0.1。获得的数据具有改善的矫顽力、饱和磁化强度和剩磁强度，使掺杂锂镉的钴铁氧体成为适用于变压器铁芯和传输线的材料。