Reaction mechanism of preparing Bi0.75Dy0.25O1.5 nanopowder by the reverse titration chemical coprecipitation method
-
摘要: 以分析純Bi2O3、Dy2O3為原料,采用反向滴定化學共沉淀法合成前軀體.經熱重-質譜分析(TG-MS),前驅體主要是由BiOOH、Dy(OH)3組成,但含有微量BiONO3、Bi2O2CO3.前驅體經過500℃煅燒3h后,X射線衍射儀(XRD)分析結果表明,得到的是單一的β-Bi0.75Dy0.25O1.5粉體,經謝樂公式計算,平均晶粒尺寸在16.02nm左右.X射線熒光光譜儀(XRF)分析結果表明,Bi/Dy摩爾比接近理論計量比.投射電子顯微鏡(TEM)分析結果表明,粉體顆粒尺寸小于20nm,分散性良好.通過熱力學計算對沉淀反應的機理進行了探討.Abstract: Using analytically pure Bi2O3 and Dy2O3 as raw materials,the Bi0.75Dy0.25O1.5 precursor was prepared by the reverse titration chemical coprecipitation method.By thermogravimetry-mass spectrum (TG-MS) analysis,the results show that the components of the precipitation are BiOOH and Dy(OH)3 with little BiONO3 and Bi2O2CO3.After calcining the precursor at 500℃ for 3 h,β-Bi0.75Dy0.25O1.5 could be obtained and its average grain size is 16.02 nm by the Scherrer formula from X-ray diffraction (XRD) analysis.X-ray fluorescence (XRF) analysis shows that the ratio of Bi/Dy extremely approaches to the theoretic stoichiometric ratio.Transmission electron microscope (TEM) analysis results show that the particles size is less than 20 nm in good dispersion.The mechanism of preparation reaction was studied by thermodynamic analysis.
-
Key words:
- nanopowder /
- bismuth oxide /
- dysprosium oxide /
- reversing titration /
- chemical coprecipitation /
- reaction mechanism
-

計量
- 文章訪問數: 140
- HTML全文瀏覽量: 37
- PDF下載量: 6
- 被引次數: 0