Fe粉含量对燃烧合成制备超细Ni0．4 Zn0．6 Fe2O4粉体相组成、形貌和磁性能影响∗

摘要

以Fe粉、NiO、ZnO 为原料,NaClO4为氧源,NaCl 为稀释剂,通过燃烧合成法成功制备了千克级超细NiZn铁氧体.采用XRD、SEM、EDS以及VSM等研究了 Fe 粉含量对 NiZn 铁氧体粉体相组成、形貌和磁性能的影响.结果表明,随着Fe粉含量k 增加,退火后颗粒尺寸逐渐增大,外形呈现为扁平球形,形成了单相铁氧体,最小粒径为750 nm,最大为1200 nm.当k＝0．7时退火的产物饱和磁化强度最大为66 A�m2/kg,而k＝0．5时产物的矫顽力最小可达16．29×79．6 A/m.%NiZn ferrite ultrafine powder were prepared by combustion synthesis using Fe,NiO and ZnO as raw materials,NaClO4 as oxygen source and NaCl as diluent.The effects of Fe amount on phases,morphology and magnetic properties were systematically investigated using scanning electron microscopy (SEM),X-ray diffrac-tion (XRD),energy dispersive spectrometer (EDS)and vibrating sample magnetism (VSM).The results showed that the size of annealed powders increased and size distribution became broader with the Fe content. After annealing,the crystalline structure of powders is more complete,the saturation magnetization of the powders reached its maximum value at 6 A�m2/kg when k is 0.7,while the coercivity obtain its minimum val-ue at 16.29×79.6 A/m when k is 0.5.