共沉淀法制备M型钡铁氧体及性能研究
发布时间：2018-07-23 20:31
【摘要】：本文主要采用共沉淀法研制出了纯度高、粒径小、分散均匀的六角M型钡铁氧体。探究了用共沉淀法制备M型钡铁氧体的工艺条件；并考察了不同分散剂(三乙胺和聚乙二醇-800)对产物的影响；考虑到稀土元素具有优良的光、电、磁性能,选取了La3+和Ce4+/Co2+对M型钡铁氧体进行掺杂,考察不同掺杂离子的掺杂量对产品物相、形貌和性能等方面的影响以及变化规律。 共沉淀法制备M型钡铁氧体的工艺条件主要探索了沉淀剂、试剂滴加方式、共沉淀pH值、共沉淀前驱体煅烧温度和煅烧时间。通过XRD分析结果显示,采用Na2CO3和NaOH作为沉淀剂,并使用反滴的方式得到的产物纯净度更高,杂相少。当共沉淀前驱体的煅烧温度为850℃,煅烧时间在1h以上,得到的产物没有杂相。 IR和BET分析结果显示,分散剂的引入在共沉淀前驱体中形成了多孔结构,反复的用水和乙醇清洗不能完全除去前驱体中的分散剂。通过850℃煅烧后,分散剂完全被除去,但是产品孔洞坍塌较为严重,比表面积减小。产物的密度分析发现,添加聚乙二醇的效果较好,产物密度随分散剂的用量增加而下降。 BaFe12O19的La3+和Ce4+/Co2+掺杂研究发现,La3+掺杂含量在研究范围内对产物物相没有影响；Ce4+/Co2+掺杂量增大到一定程度后(x=0.3)产物开始出现杂相Ce02。离子掺杂对产品的形貌影响不大,所得样品均是六角片状结构,与BaFe12O19的结构相符合。 产品的磁性表征显示,离子掺杂对钡铁氧体的饱和磁化强度和剩余磁化强度有较大的影响,随着掺杂离子掺杂量的增多,饱和磁化强度和剩余磁化强度均呈下降趋势；产品的矫顽力受Ce4+/Co2+掺杂的浓度影响较大,随着掺杂量的增多显著下降；掺杂La3+的样品的矫顽力下降不是很明显,这与离子取代BaFe12O19晶格中不同位点的Fe3+离子有关。因此,通过对产品进行适当的离子掺杂,可以调整BaFe12O19的磁性参数,制备所需要的产品。
[Abstract]:In this paper, hexagonal M-type barium ferrite with high purity, small particle size and uniform dispersion was prepared by coprecipitation method. The preparation conditions of M-type barium ferrite by coprecipitation were investigated, and the effects of different dispersants (triethylamine and polyethylene glycol -800) on the product were investigated, considering the excellent optical, electrical and magnetic properties of rare earth elements. M-type barium ferrite was doped by La3 and Ce4 / Co _ 2. The effects of doping amount of doping ions on the phase, morphology and properties of the product were investigated. The preparation conditions of M-type barium ferrite by coprecipitation were studied, such as precipitator, reagent dripping method, co-precipitation pH value, calcination temperature and time of co-precipitation precursor. The results of XRD analysis showed that the purity of the product was higher and the impurity phase was less when Na2CO3 and NaOH were used as precipitators and reverse drops were used. When the calcination temperature of the coprecipitation precursor is 850 鈩，
本文编号：2140557
[Abstract]:In this paper, hexagonal M-type barium ferrite with high purity, small particle size and uniform dispersion was prepared by coprecipitation method. The preparation conditions of M-type barium ferrite by coprecipitation were investigated, and the effects of different dispersants (triethylamine and polyethylene glycol -800) on the product were investigated, considering the excellent optical, electrical and magnetic properties of rare earth elements. M-type barium ferrite was doped by La3 and Ce4 / Co _ 2. The effects of doping amount of doping ions on the phase, morphology and properties of the product were investigated. The preparation conditions of M-type barium ferrite by coprecipitation were studied, such as precipitator, reagent dripping method, co-precipitation pH value, calcination temperature and time of co-precipitation precursor. The results of XRD analysis showed that the purity of the product was higher and the impurity phase was less when Na2CO3 and NaOH were used as precipitators and reverse drops were used. When the calcination temperature of the coprecipitation precursor is 850 鈩，
本文编号：2140557
本文链接：https://www.wllwen.com/shekelunwen/minzhuminquanlunwen/2140557.html
