化学共沉淀法制备NiCuZn铁氧体及其性能研究

利用化学共沉淀法制备了NiCuZn铁氧体微粉，研究了反应温度、搅拌速率和盐溶液流速对前驱体粒径的影响。通过XRD、TEM、激光粒度仪（LPS）、精密阻抗分析仪、振动样品磁强计(VSM)等手段对最优条件下得到的样品进行表征。结果表明：当反应温度为70 ℃，盐溶液的流速为0.5 mL/min，搅拌速率为300 r/min时得到尖晶石相的粉体，粒度约为30 nm。将微粉体在500 ℃预烧，在900 ℃烧结后得到样品的相对密度为98%，起始磁导率μi约为200，品质因数Q约为150。截止频率约为70 MHZ

Preparation and Properties of NiCuZn Ferrite Powders by Chemical Co-Precipitation Method

NiCuZn ferrite powder with fine particles size distribution and high activity was synthesized by chemical co-precipitation. The effects of synthetic conditions, such as reaction temperature, stirring speed and flow rate of salt solution, on the precursor particle size of NiCuZn ferrite were investigated. The samples prepared at the optimal condition were characterized by XRD, TEM, laser particle size analyzer (LPS), precision impedance analyzer and vibrating sample magnetometer (VSM). The results show that the powder is possessed of pure spinel, the particle size of about 30 nm, the average grain size of 11 nm, while the synthetic conditions are the reaction temperature for 70 °C, the flow velocity of the salt solution for 0.5 mL/min, stirring speed for 300 r/min. NiCuZn ferrites, presintered at 500 °C and sintered at 900 °C, have achieved excellent magnetics. The relative density of sample is 98%, the initial magnetic permeability is 200, quality factor is 150 and the cut-off frequency is 70 MHz