摘要
采用高分子凝胶法制备了Ni0.5Zn0.5LaxFe2-xO4(x=0,0.02,0.05和0.08)纳米晶铁氧体.采用X射线衍射仪(XRD)、透射电镜(TEM)和HP8510网络分析仪分别对其结构、形貌和电磁性能进行了研究.结果表明,当x=0,0.02和0.05时,所得粉体为纯立方晶系尖晶石结构.Ni0.5Zn0.5Fe2O4粉体平均粒径为70nm.随着La离子掺杂量的增加,红外光谱中550cm-1处吸收峰向高波数移动,420cm-1处吸收峰向低波数移动.La离子的掺杂对Ni-Zn铁氧体的电磁性能有一定的影响.在X波段,与Ni0.5Zn0.5Fe2O4铁氧体相比,掺杂La的Ni-Zn铁氧体的tanδm值降低,tanδε值升高.Ni0.5Zn0.5La0.02Fe1.98O4铁氧体的tanδε平均值为0.616.
Nanocrystalline Ni0.5Zn0.5LaxFe2-xO4 ferrites with x =0,0. 02,0. 05 and 0. 08 were successfully prepared by the polyacrylamide gel method. The structural characteristics,morphology and electromagnetic properties of the composite powders were obtained by X-ray diffraction （ XRD） ,transmission electron microscope （ TEM） and HP8510 network analyzer. The results show that the obtained Ni0.5Zn0.5LaxFe2-xO4 ferrites with x = 0,0. 02 and 0. 05 are single phase cubic spinel structures. The average particle size of Ni0.5 Zn0.5 Fe2 O4 ferrite is about 70 nm. The absorption band at around 550 cm-1 slightly shifts toward higher value and 420 cm-1 slightly shifts toward lower value with La-doped content increasing. La3 ＋ ion doping had an intimate effect on the electromagnetic properties of Ni0.5Zn0.5LaxFe2-xO4 ferrites. The tan δm values of the none doped Ni-Zn ferrite are higher than those of the La-doped samples in the X band. The tan δε values of the La-doped Ni-Zn ferrites are higher than those of the none La-doped Ni-Zn ferrite. The average tan δεvalue for the specimen of x = 0. 02 is 0. 616.
出处
《纳米技术与精密工程》
EI
CAS
CSCD
2010年第3期235-239,共5页
Nanotechnology and Precision Engineering
基金
support of Doctor Foun-dation of Liaoning Province(2081028)~~
关键词
镧掺杂镍锌铁氧体
电磁性能
高分子凝胶法
纳米晶体
La-doped Ni-Zn ferrite
electromagnetic properties
polyacrylamide gel method
nanocrystalline
