【摘要】：本文主要采用共沉淀法研制出了純度高、粒徑小、分散均勻的六角M型鋇鐵氧體。探究了用共沉淀法制備M型鋇鐵氧體的工藝條件；并考察了不同分散劑(三乙胺和聚乙二醇-800)對產物的影響；考慮到稀土元素具有優(yōu)良的光、電、磁性能,選取了La3+和Ce4+/Co2+對M型鋇鐵氧體進行摻雜,考察不同摻雜離子的摻雜量對產品物相、形貌和性能等方面的影響以及變化規(guī)律。 共沉淀法制備M型鋇鐵氧體的工藝條件主要探索了沉淀劑、試劑滴加方式、共沉淀pH值、共沉淀前驅體煅燒溫度和煅燒時間。通過XRD分析結果顯示,采用Na2CO3和NaOH作為沉淀劑,并使用反滴的方式得到的產物純凈度更高,雜相少。當共沉淀前驅體的煅燒溫度為850℃,煅燒時間在1h以上,得到的產物沒有雜相。 IR和BET分析結果顯示,分散劑的引入在共沉淀前驅體中形成了多孔結構,反復的用水和乙醇清洗不能完全除去前驅體中的分散劑。通過850℃煅燒后,分散劑完全被除去,但是產品孔洞坍塌較為嚴重,比表面積減小。產物的密度分析發(fā)現(xiàn),添加聚乙二醇的效果較好,產物密度隨分散劑的用量增加而下降。 BaFe12O19的La3+和Ce4+/Co2+摻雜研究發(fā)現(xiàn),La3+摻雜含量在研究范圍內對產物物相沒有影響；Ce4+/Co2+摻雜量增大到一定程度后(x=0.3)產物開始出現(xiàn)雜相Ce02。離子摻雜對產品的形貌影響不大,所得樣品均是六角片狀結構,與BaFe12O19的結構相符合。 產品的磁性表征顯示,離子摻雜對鋇鐵氧體的飽和磁化強度和剩余磁化強度有較大的影響,隨著摻雜離子摻雜量的增多,飽和磁化強度和剩余磁化強度均呈下降趨勢；產品的矯頑力受Ce4+/Co2+摻雜的濃度影響較大,隨著摻雜量的增多顯著下降；摻雜La3+的樣品的矯頑力下降不是很明顯,這與離子取代BaFe12O19晶格中不同位點的Fe3+離子有關。因此,通過對產品進行適當?shù)碾x子摻雜,可以調整BaFe12O19的磁性參數(shù),制備所需要的產品。
[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，

本文編號：2140557