掺杂Co^(2+)和Sm^(3+)对纳米ZnFe_2O_4铁氧体的电磁损耗性质的影响

Effect of Sm^(3+) and Co^(2+) Doping into ZnFe_2O_4 Nano-ferrite on Electromagnetic Loss Property

采用NaHCO3与FeCl3?6H2O,ZnSO4?7H2O,Co(NO3)2?6H2O和Sm(NO3)3?6H2O进行室温固相反应制得碱式碳酸盐和氢氧化铁混合前驱物,先微波加热,再热分解分别制得复合氧化物ZnFe2O4,Co0.5Zn0.5Fe2O4和Co0.5Zn0.5Fe1.95-Sm0.05O4.由激光粒度分析仪、XRD和SEM表征:获得了颗粒分布均匀、平均粒度为62nm左右的立方晶系尖晶石结构的纳米铁氧体粉体.并测试样品的相对介电常数和相对磁导率,研究了它们的电磁损耗特性.结果表明:在ZnFe2O4中,掺入Co2+,Sm3+元素可以在100～1800MHz测试频率范围内不同程度提高材料的电磁损耗特性.

The precursors of basic carbonates and ferric hydrate for ferrite were prepared by solid-state reaction at room temperature and characterized by TG-DSC. The nanometer spinel ferrites with the average size of 62 nm were obtained by microwave heating at 600 W for 10 min, then thermolysis at 550 ℃, and studied by a laser granularity analyzer, XRD and SEM. The electromagnetic loss property was studied by the relative dielectric constant and relative magnetic permeability of the ferrites. The results show that when Co^2＋ partially substituted Zn^2＋ in ZnFe2O4, the electromagnetic loss property of materials was obviously improved in 100N 1800 MHz. On the other hand when Fe^3＋ was substituted less by Sm^3＋ in Co0.5Zn0.5Fe2O4, the electromagnetic loss property of materials was increased properly.